drivers/acpi/video_detect.c

   1 /*
   2  *  Copyright (C) 2015       Red Hat Inc.
   3  *                           Hans de Goede <hdegoede@redhat.com>
   4  *  Copyright (C) 2008       SuSE Linux Products GmbH
   5  *                           Thomas Renninger <trenn@suse.de>
   6  *
   7  *  May be copied or modified under the terms of the GNU General Public License
   8  *
   9  * video_detect.c:
  10  * After PCI devices are glued with ACPI devices
  11  * acpi_get_pci_dev() can be called to identify ACPI graphics
  12  * devices for which a real graphics card is plugged in
  13  *
  14  * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
  15  * are available, video.ko should be used to handle the device.
  16  *
  17  * Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
  18  * sony_acpi,... can take care about backlight brightness.
  19  *
  20  * Backlight drivers can use acpi_video_get_backlight_type() to determine which
  21  * driver should handle the backlight. RAW/GPU-driver backlight drivers must
  22  * use the acpi_video_backlight_use_native() helper for this.
  23  *
  24  * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
  25  * this file will not be compiled and acpi_video_get_backlight_type() will
  26  * always return acpi_backlight_vendor.
  27  */
  28
  29 #include <linux/export.h>
  30 #include <linux/acpi.h>
  31 #include <linux/apple-gmux.h>
  32 #include <linux/backlight.h>
  33 #include <linux/dmi.h>
  34 #include <linux/module.h>
  35 #include <linux/pci.h>
  36 #include <linux/platform_data/x86/nvidia-wmi-ec-backlight.h>
  37 #include <linux/pnp.h>
  38 #include <linux/types.h>
  39 #include <linux/workqueue.h>
  40 #include <acpi/video.h>
  41
  42 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
  43 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
  44
  45 static void acpi_video_parse_cmdline(void)
  46 {
  47         if (!strcmp("vendor", acpi_video_backlight_string))
  48                 acpi_backlight_cmdline = acpi_backlight_vendor;
  49         if (!strcmp("video", acpi_video_backlight_string))
  50                 acpi_backlight_cmdline = acpi_backlight_video;
  51         if (!strcmp("native", acpi_video_backlight_string))
  52                 acpi_backlight_cmdline = acpi_backlight_native;
  53         if (!strcmp("nvidia_wmi_ec", acpi_video_backlight_string))
  54                 acpi_backlight_cmdline = acpi_backlight_nvidia_wmi_ec;
  55         if (!strcmp("apple_gmux", acpi_video_backlight_string))
  56                 acpi_backlight_cmdline = acpi_backlight_apple_gmux;
  57         if (!strcmp("none", acpi_video_backlight_string))
  58                 acpi_backlight_cmdline = acpi_backlight_none;
  59 }
  60
  61 static acpi_status
  62 find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
  63 {
  64         struct acpi_device *acpi_dev = acpi_fetch_acpi_dev(handle);
  65         long *cap = context;
  66         struct pci_dev *dev;
  67
  68         static const struct acpi_device_id video_ids[] = {
  69                 {ACPI_VIDEO_HID, 0},
  70                 {"", 0},
  71         };
  72
  73         if (acpi_dev && !acpi_match_device_ids(acpi_dev, video_ids)) {
  74                 dev = acpi_get_pci_dev(handle);
  75                 if (!dev)
  76                         return AE_OK;
  77                 pci_dev_put(dev);
  78                 *cap |= acpi_is_video_device(handle);
  79         }
  80         return AE_OK;
  81 }
  82
  83 /* This depends on ACPI_WMI which is X86 only */
  84 #ifdef CONFIG_X86
  85 static bool nvidia_wmi_ec_supported(void)
  86 {
  87         struct wmi_brightness_args args = {
  88                 .mode = WMI_BRIGHTNESS_MODE_GET,
  89                 .val = 0,
  90                 .ret = 0,
  91         };
  92         struct acpi_buffer buf = { (acpi_size)sizeof(args), &args };
  93         acpi_status status;
  94
  95         status = wmi_evaluate_method(WMI_BRIGHTNESS_GUID, 0,
  96                                      WMI_BRIGHTNESS_METHOD_SOURCE, &buf, &buf);
  97         if (ACPI_FAILURE(status))
  98                 return false;
  99
 100         /*
 101          * If brightness is handled by the EC then nvidia-wmi-ec-backlight
 102          * should be used, else the GPU driver(s) should be used.
 103          */
 104         return args.ret == WMI_BRIGHTNESS_SOURCE_EC;
 105 }
 106 #else
 107 static bool nvidia_wmi_ec_supported(void)
 108 {
 109         return false;
 110 }
 111 #endif
 112
 113 /* Force to use vendor driver when the ACPI device is known to be
 114  * buggy */
 115 static int video_detect_force_vendor(const struct dmi_system_id *d)
 116 {
 117         acpi_backlight_dmi = acpi_backlight_vendor;
 118         return 0;
 119 }
 120
 121 static int video_detect_force_video(const struct dmi_system_id *d)
 122 {
 123         acpi_backlight_dmi = acpi_backlight_video;
 124         return 0;
 125 }
 126
 127 static int video_detect_force_native(const struct dmi_system_id *d)
 128 {
 129         acpi_backlight_dmi = acpi_backlight_native;
 130         return 0;
 131 }
 132
 133 static const struct dmi_system_id video_detect_dmi_table[] = {
 134         /*
 135          * Models which should use the vendor backlight interface,
 136          * because of broken ACPI video backlight control.
 137          */
 138         {
 139          /* https://bugzilla.redhat.com/show_bug.cgi?id=1128309 */
 140          .callback = video_detect_force_vendor,
 141          /* Acer KAV80 */
 142          .matches = {
 143                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 144                 DMI_MATCH(DMI_PRODUCT_NAME, "KAV80"),
 145                 },
 146         },
 147         {
 148          .callback = video_detect_force_vendor,
 149          /* Asus UL30VT */
 150          .matches = {
 151                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 152                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30VT"),
 153                 },
 154         },
 155         {
 156          .callback = video_detect_force_vendor,
 157          /* Asus UL30A */
 158          .matches = {
 159                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 160                 DMI_MATCH(DMI_PRODUCT_NAME, "UL30A"),
 161                 },
 162         },
 163         {
 164          .callback = video_detect_force_vendor,
 165          /* Asus X55U */
 166          .matches = {
 167                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 168                 DMI_MATCH(DMI_PRODUCT_NAME, "X55U"),
 169                 },
 170         },
 171         {
 172          /* https://bugs.launchpad.net/bugs/1000146 */
 173          .callback = video_detect_force_vendor,
 174          /* Asus X101CH */
 175          .matches = {
 176                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 177                 DMI_MATCH(DMI_PRODUCT_NAME, "X101CH"),
 178                 },
 179         },
 180         {
 181          .callback = video_detect_force_vendor,
 182          /* Asus X401U */
 183          .matches = {
 184                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 185                 DMI_MATCH(DMI_PRODUCT_NAME, "X401U"),
 186                 },
 187         },
 188         {
 189          .callback = video_detect_force_vendor,
 190          /* Asus X501U */
 191          .matches = {
 192                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 193                 DMI_MATCH(DMI_PRODUCT_NAME, "X501U"),
 194                 },
 195         },
 196         {
 197          /* https://bugs.launchpad.net/bugs/1000146 */
 198          .callback = video_detect_force_vendor,
 199          /* Asus 1015CX */
 200          .matches = {
 201                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 202                 DMI_MATCH(DMI_PRODUCT_NAME, "1015CX"),
 203                 },
 204         },
 205         {
 206          .callback = video_detect_force_vendor,
 207          /* Samsung N150/N210/N220 */
 208          .matches = {
 209                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 210                 DMI_MATCH(DMI_PRODUCT_NAME, "N150/N210/N220"),
 211                 DMI_MATCH(DMI_BOARD_NAME, "N150/N210/N220"),
 212                 },
 213         },
 214         {
 215          .callback = video_detect_force_vendor,
 216          /* Samsung NF110/NF210/NF310 */
 217          .matches = {
 218                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 219                 DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
 220                 DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
 221                 },
 222         },
 223         {
 224          .callback = video_detect_force_vendor,
 225          /* Samsung NC210 */
 226          .matches = {
 227                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 228                 DMI_MATCH(DMI_PRODUCT_NAME, "NC210/NC110"),
 229                 DMI_MATCH(DMI_BOARD_NAME, "NC210/NC110"),
 230                 },
 231         },
 232         {
 233          .callback = video_detect_force_vendor,
 234          /* Xiaomi Mi Pad 2 */
 235          .matches = {
 236                         DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
 237                         DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
 238                 },
 239         },
 240
 241         /*
 242          * Models which should use the vendor backlight interface,
 243          * because of broken native backlight control.
 244          */
 245         {
 246          .callback = video_detect_force_vendor,
 247          /* Sony Vaio PCG-FRV35 */
 248          .matches = {
 249                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 250                 DMI_MATCH(DMI_PRODUCT_NAME, "PCG-FRV35"),
 251                 },
 252         },
 253
 254         /*
 255          * Toshiba models with Transflective display, these need to use
 256          * the toshiba_acpi vendor driver for proper Transflective handling.
 257          */
 258         {
 259          .callback = video_detect_force_vendor,
 260          .matches = {
 261                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 262                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R500"),
 263                 },
 264         },
 265         {
 266          .callback = video_detect_force_vendor,
 267          .matches = {
 268                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 269                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R600"),
 270                 },
 271         },
 272
 273         /*
 274          * Models which need acpi_video backlight control where the GPU drivers
 275          * do not call acpi_video_register_backlight() because no internal panel
 276          * is detected. Typically these are all-in-ones (monitors with builtin
 277          * PC) where the panel connection shows up as regular DP instead of eDP.
 278          */
 279         {
 280          .callback = video_detect_force_video,
 281          /* Apple iMac14,1 */
 282          .matches = {
 283                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 284                 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,1"),
 285                 },
 286         },
 287         {
 288          .callback = video_detect_force_video,
 289          /* Apple iMac14,2 */
 290          .matches = {
 291                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 292                 DMI_MATCH(DMI_PRODUCT_NAME, "iMac14,2"),
 293                 },
 294         },
 295
 296         /*
 297          * Older models with nvidia GPU which need acpi_video backlight
 298          * control and where the old nvidia binary driver series does not
 299          * call acpi_video_register_backlight().
 300          */
 301         {
 302          .callback = video_detect_force_video,
 303          /* ThinkPad W530 */
 304          .matches = {
 305                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 306                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad W530"),
 307                 },
 308         },
 309
 310         /*
 311          * These models have a working acpi_video backlight control, and using
 312          * native backlight causes a regression where backlight does not work
 313          * when userspace is not handling brightness key events. Disable
 314          * native_backlight on these to fix this:
 315          * https://bugzilla.kernel.org/show_bug.cgi?id=81691
 316          */
 317         {
 318          .callback = video_detect_force_video,
 319          /* ThinkPad T420 */
 320          .matches = {
 321                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 322                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
 323                 },
 324         },
 325         {
 326          .callback = video_detect_force_video,
 327          /* ThinkPad T520 */
 328          .matches = {
 329                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 330                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
 331                 },
 332         },
 333         {
 334          .callback = video_detect_force_video,
 335          /* ThinkPad X201s */
 336          .matches = {
 337                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 338                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
 339                 },
 340         },
 341         {
 342          .callback = video_detect_force_video,
 343          /* ThinkPad X201T */
 344          .matches = {
 345                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 346                 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201T"),
 347                 },
 348         },
 349
 350         /* The native backlight controls do not work on some older machines */
 351         {
 352          /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
 353          .callback = video_detect_force_video,
 354          /* HP ENVY 15 Notebook */
 355          .matches = {
 356                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 357                 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
 358                 },
 359         },
 360         {
 361          .callback = video_detect_force_video,
 362          /* SAMSUNG 870Z5E/880Z5E/680Z5E */
 363          .matches = {
 364                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 365                 DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
 366                 },
 367         },
 368         {
 369          .callback = video_detect_force_video,
 370          /* SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V */
 371          .matches = {
 372                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 373                 DMI_MATCH(DMI_PRODUCT_NAME,
 374                           "370R4E/370R4V/370R5E/3570RE/370R5V"),
 375                 },
 376         },
 377         {
 378          /* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
 379          .callback = video_detect_force_video,
 380          /* SAMSUNG 3570R/370R/470R/450R/510R/4450RV */
 381          .matches = {
 382                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 383                 DMI_MATCH(DMI_PRODUCT_NAME,
 384                           "3570R/370R/470R/450R/510R/4450RV"),
 385                 },
 386         },
 387         {
 388          /* https://bugzilla.redhat.com/show_bug.cgi?id=1557060 */
 389          .callback = video_detect_force_video,
 390          /* SAMSUNG 670Z5E */
 391          .matches = {
 392                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 393                 DMI_MATCH(DMI_PRODUCT_NAME, "670Z5E"),
 394                 },
 395         },
 396         {
 397          /* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
 398          .callback = video_detect_force_video,
 399          /* SAMSUNG 730U3E/740U3E */
 400          .matches = {
 401                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 402                 DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
 403                 },
 404         },
 405         {
 406          /* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
 407          .callback = video_detect_force_video,
 408          /* SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D */
 409          .matches = {
 410                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 411                 DMI_MATCH(DMI_PRODUCT_NAME,
 412                           "900X3C/900X3D/900X3E/900X4C/900X4D"),
 413                 },
 414         },
 415         {
 416          /* https://bugzilla.redhat.com/show_bug.cgi?id=1272633 */
 417          .callback = video_detect_force_video,
 418          /* Dell XPS14 L421X */
 419          .matches = {
 420                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 421                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L421X"),
 422                 },
 423         },
 424         {
 425          /* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
 426          .callback = video_detect_force_video,
 427          /* Dell XPS15 L521X */
 428          .matches = {
 429                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 430                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
 431                 },
 432         },
 433         {
 434          /* https://bugzilla.kernel.org/show_bug.cgi?id=108971 */
 435          .callback = video_detect_force_video,
 436          /* SAMSUNG 530U4E/540U4E */
 437          .matches = {
 438                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 439                 DMI_MATCH(DMI_PRODUCT_NAME, "530U4E/540U4E"),
 440                 },
 441         },
 442         {
 443          /* https://bugs.launchpad.net/bugs/1894667 */
 444          .callback = video_detect_force_video,
 445          /* HP 635 Notebook */
 446          .matches = {
 447                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 448                 DMI_MATCH(DMI_PRODUCT_NAME, "HP 635 Notebook PC"),
 449                 },
 450         },
 451
 452         /* Non win8 machines which need native backlight nevertheless */
 453         {
 454          /* https://bugzilla.redhat.com/show_bug.cgi?id=1201530 */
 455          .callback = video_detect_force_native,
 456          /* Lenovo Ideapad S405 */
 457          .matches = {
 458                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 459                 DMI_MATCH(DMI_BOARD_NAME, "Lenovo IdeaPad S405"),
 460                 },
 461         },
 462         {
 463          /* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
 464          .callback = video_detect_force_native,
 465          /* Lenovo Ideapad Z570 */
 466          .matches = {
 467                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 468                 DMI_MATCH(DMI_PRODUCT_VERSION, "Ideapad Z570"),
 469                 },
 470         },
 471         {
 472          .callback = video_detect_force_native,
 473          /* Lenovo E41-25 */
 474          .matches = {
 475                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 476                 DMI_MATCH(DMI_PRODUCT_NAME, "81FS"),
 477                 },
 478         },
 479         {
 480          .callback = video_detect_force_native,
 481          /* Lenovo E41-45 */
 482          .matches = {
 483                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 484                 DMI_MATCH(DMI_PRODUCT_NAME, "82BK"),
 485                 },
 486         },
 487         {
 488          /* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
 489          .callback = video_detect_force_native,
 490          /* Apple MacBook Pro 12,1 */
 491          .matches = {
 492                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
 493                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
 494                 },
 495         },
 496         {
 497          .callback = video_detect_force_native,
 498          /* Dell Inspiron N4010 */
 499          .matches = {
 500                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 501                 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N4010"),
 502                 },
 503         },
 504         {
 505          .callback = video_detect_force_native,
 506          /* Dell Vostro V131 */
 507          .matches = {
 508                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 509                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
 510                 },
 511         },
 512         {
 513          /* https://bugzilla.redhat.com/show_bug.cgi?id=1123661 */
 514          .callback = video_detect_force_native,
 515          /* Dell XPS 17 L702X */
 516          .matches = {
 517                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 518                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell System XPS L702X"),
 519                 },
 520         },
 521         {
 522          .callback = video_detect_force_native,
 523          /* Dell Precision 7510 */
 524          .matches = {
 525                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 526                 DMI_MATCH(DMI_PRODUCT_NAME, "Precision 7510"),
 527                 },
 528         },
 529         {
 530          .callback = video_detect_force_native,
 531          /* Acer Aspire 3830TG */
 532          .matches = {
 533                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 534                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 3830TG"),
 535                 },
 536         },
 537         {
 538          .callback = video_detect_force_native,
 539          /* Acer Aspire 4810T */
 540          .matches = {
 541                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 542                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 4810T"),
 543                 },
 544         },
 545         {
 546          .callback = video_detect_force_native,
 547          /* Acer Aspire 5738z */
 548          .matches = {
 549                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 550                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5738"),
 551                 DMI_MATCH(DMI_BOARD_NAME, "JV50"),
 552                 },
 553         },
 554         {
 555          /* https://bugzilla.redhat.com/show_bug.cgi?id=1012674 */
 556          .callback = video_detect_force_native,
 557          /* Acer Aspire 5741 */
 558          .matches = {
 559                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 560                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5741"),
 561                 },
 562         },
 563         {
 564          /* https://bugzilla.kernel.org/show_bug.cgi?id=42993 */
 565          .callback = video_detect_force_native,
 566          /* Acer Aspire 5750 */
 567          .matches = {
 568                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 569                 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5750"),
 570                 },
 571         },
 572         {
 573          /* https://bugzilla.kernel.org/show_bug.cgi?id=42833 */
 574          .callback = video_detect_force_native,
 575          /* Acer Extensa 5235 */
 576          .matches = {
 577                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 578                 DMI_MATCH(DMI_PRODUCT_NAME, "Extensa 5235"),
 579                 },
 580         },
 581         {
 582          .callback = video_detect_force_native,
 583          /* Acer TravelMate 4750 */
 584          .matches = {
 585                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 586                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 4750"),
 587                 },
 588         },
 589         {
 590          /* https://bugzilla.kernel.org/show_bug.cgi?id=207835 */
 591          .callback = video_detect_force_native,
 592          /* Acer TravelMate 5735Z */
 593          .matches = {
 594                 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
 595                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5735Z"),
 596                 DMI_MATCH(DMI_BOARD_NAME, "BA51_MV"),
 597                 },
 598         },
 599         {
 600          /* https://bugzilla.kernel.org/show_bug.cgi?id=36322 */
 601          .callback = video_detect_force_native,
 602          /* Acer TravelMate 5760 */
 603          .matches = {
 604                 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
 605                 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 5760"),
 606                 },
 607         },
 608         {
 609          .callback = video_detect_force_native,
 610          /* ASUSTeK COMPUTER INC. GA401 */
 611          .matches = {
 612                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 613                 DMI_MATCH(DMI_PRODUCT_NAME, "GA401"),
 614                 },
 615         },
 616         {
 617          .callback = video_detect_force_native,
 618          /* ASUSTeK COMPUTER INC. GA502 */
 619          .matches = {
 620                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 621                 DMI_MATCH(DMI_PRODUCT_NAME, "GA502"),
 622                 },
 623         },
 624         {
 625          .callback = video_detect_force_native,
 626          /* ASUSTeK COMPUTER INC. GA503 */
 627          .matches = {
 628                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 629                 DMI_MATCH(DMI_PRODUCT_NAME, "GA503"),
 630                 },
 631         },
 632         {
 633          .callback = video_detect_force_native,
 634          /* Asus U46E */
 635          .matches = {
 636                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 637                 DMI_MATCH(DMI_PRODUCT_NAME, "U46E"),
 638                 },
 639         },
 640         {
 641          .callback = video_detect_force_native,
 642          /* Asus UX303UB */
 643          .matches = {
 644                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 645                 DMI_MATCH(DMI_PRODUCT_NAME, "UX303UB"),
 646                 },
 647         },
 648         {
 649          .callback = video_detect_force_native,
 650          /* HP EliteBook 8460p */
 651          .matches = {
 652                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 653                 DMI_MATCH(DMI_PRODUCT_NAME, "HP EliteBook 8460p"),
 654                 },
 655         },
 656         {
 657          .callback = video_detect_force_native,
 658          /* HP Pavilion g6-1d80nr / B4U19UA */
 659          .matches = {
 660                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 661                 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"),
 662                 DMI_MATCH(DMI_PRODUCT_SKU, "B4U19UA"),
 663                 },
 664         },
 665         {
 666          .callback = video_detect_force_native,
 667          /* Samsung N150P */
 668          .matches = {
 669                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 670                 DMI_MATCH(DMI_PRODUCT_NAME, "N150P"),
 671                 DMI_MATCH(DMI_BOARD_NAME, "N150P"),
 672                 },
 673         },
 674         {
 675          .callback = video_detect_force_native,
 676          /* Samsung N145P/N250P/N260P */
 677          .matches = {
 678                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 679                 DMI_MATCH(DMI_PRODUCT_NAME, "N145P/N250P/N260P"),
 680                 DMI_MATCH(DMI_BOARD_NAME, "N145P/N250P/N260P"),
 681                 },
 682         },
 683         {
 684          .callback = video_detect_force_native,
 685          /* Samsung N250P */
 686          .matches = {
 687                 DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
 688                 DMI_MATCH(DMI_PRODUCT_NAME, "N250P"),
 689                 DMI_MATCH(DMI_BOARD_NAME, "N250P"),
 690                 },
 691         },
 692         {
 693          /* https://bugzilla.kernel.org/show_bug.cgi?id=202401 */
 694          .callback = video_detect_force_native,
 695          /* Sony Vaio VPCEH3U1E */
 696          .matches = {
 697                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 698                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"),
 699                 },
 700         },
 701         {
 702          .callback = video_detect_force_native,
 703          /* Sony Vaio VPCY11S1E */
 704          .matches = {
 705                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 706                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCY11S1E"),
 707                 },
 708         },
 709
 710         /*
 711          * These Toshibas have a broken acpi-video interface for brightness
 712          * control. They also have an issue where the panel is off after
 713          * suspend until a special firmware call is made to turn it back
 714          * on. This is handled by the toshiba_acpi kernel module, so that
 715          * module must be enabled for these models to work correctly.
 716          */
 717         {
 718          /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 719          .callback = video_detect_force_native,
 720          /* Toshiba Portégé R700 */
 721          .matches = {
 722                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 723                 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
 724                 },
 725         },
 726         {
 727          /* Portégé: https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
 728          /* Satellite: https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
 729          .callback = video_detect_force_native,
 730          /* Toshiba Satellite/Portégé R830 */
 731          .matches = {
 732                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 733                 DMI_MATCH(DMI_PRODUCT_NAME, "R830"),
 734                 },
 735         },
 736         {
 737          .callback = video_detect_force_native,
 738          /* Toshiba Satellite/Portégé Z830 */
 739          .matches = {
 740                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 741                 DMI_MATCH(DMI_PRODUCT_NAME, "Z830"),
 742                 },
 743         },
 744
 745         /*
 746          * Models which have nvidia-ec-wmi support, but should not use it.
 747          * Note this indicates a likely firmware bug on these models and should
 748          * be revisited if/when Linux gets support for dynamic mux mode.
 749          */
 750         {
 751          .callback = video_detect_force_native,
 752          /* Dell G15 5515 */
 753          .matches = {
 754                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 755                 DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
 756                 },
 757         },
 758         {
 759          .callback = video_detect_force_native,
 760          .matches = {
 761                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 762                 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 15 3535"),
 763                 },
 764         },
 765         { },
 766 };
 767
 768 static bool google_cros_ec_present(void)
 769 {
 770         return acpi_dev_found("GOOG0004") || acpi_dev_found("GOOG000C");
 771 }
 772
 773 /*
 774  * Windows 8 and newer no longer use the ACPI video interface, so it often
 775  * does not work. So on win8+ systems prefer native brightness control.
 776  * Chromebooks should always prefer native backlight control.
 777  */
 778 static bool prefer_native_over_acpi_video(void)
 779 {
 780         return acpi_osi_is_win8() || google_cros_ec_present();
 781 }
 782
 783 /*
 784  * Determine which type of backlight interface to use on this system,
 785  * First check cmdline, then dmi quirks, then do autodetect.
 786  */
 787 enum acpi_backlight_type __acpi_video_get_backlight_type(bool native, bool *auto_detect)
 788 {
 789         static DEFINE_MUTEX(init_mutex);
 790         static bool nvidia_wmi_ec_present;
 791         static bool apple_gmux_present;
 792         static bool native_available;
 793         static bool init_done;
 794         static long video_caps;
 795
 796         /* Parse cmdline, dmi and acpi only once */
 797         mutex_lock(&init_mutex);
 798         if (!init_done) {
 799                 acpi_video_parse_cmdline();
 800                 dmi_check_system(video_detect_dmi_table);
 801                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 802                                     ACPI_UINT32_MAX, find_video, NULL,
 803                                     &video_caps, NULL);
 804                 nvidia_wmi_ec_present = nvidia_wmi_ec_supported();
 805                 apple_gmux_present = apple_gmux_detect(NULL, NULL);
 806                 init_done = true;
 807         }
 808         if (native)
 809                 native_available = true;
 810         mutex_unlock(&init_mutex);
 811
 812         if (auto_detect)
 813                 *auto_detect = false;
 814
 815         /*
 816          * The below heuristics / detection steps are in order of descending
 817          * presedence. The commandline takes presedence over anything else.
 818          */
 819         if (acpi_backlight_cmdline != acpi_backlight_undef)
 820                 return acpi_backlight_cmdline;
 821
 822         /* DMI quirks override any autodetection. */
 823         if (acpi_backlight_dmi != acpi_backlight_undef)
 824                 return acpi_backlight_dmi;
 825
 826         if (auto_detect)
 827                 *auto_detect = true;
 828
 829         /* Special cases such as nvidia_wmi_ec and apple gmux. */
 830         if (nvidia_wmi_ec_present)
 831                 return acpi_backlight_nvidia_wmi_ec;
 832
 833         if (apple_gmux_present)
 834                 return acpi_backlight_apple_gmux;
 835
 836         /* Use ACPI video if available, except when native should be preferred. */
 837         if ((video_caps & ACPI_VIDEO_BACKLIGHT) &&
 838              !(native_available && prefer_native_over_acpi_video()))
 839                 return acpi_backlight_video;
 840
 841         /* Use native if available */
 842         if (native_available)
 843                 return acpi_backlight_native;
 844
 845         /* No ACPI video/native (old hw), use vendor specific fw methods. */
 846         return acpi_backlight_vendor;
 847 }
 848 EXPORT_SYMBOL(__acpi_video_get_backlight_type);