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27 struct i915_params i915 __read_mostly = {
29 .panel_ignore_lid = 1,
33 .lvds_channel_mode = 0,
35 .vbt_sdvo_panel_type = -1,
38 .enable_hangcheck = true,
41 .preliminary_hw_support = IS_ENABLED(CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT),
42 .disable_power_well = 1,
47 .prefault_disable = 0,
49 .invert_brightness = 0,
52 module_param_named(modeset, i915.modeset, int, 0400);
53 MODULE_PARM_DESC(modeset,
54 "Use kernel modesetting [KMS] (0=DRM_I915_KMS from .config, "
55 "1=on, -1=force vga console preference [default])");
57 module_param_named(panel_ignore_lid, i915.panel_ignore_lid, int, 0600);
58 MODULE_PARM_DESC(panel_ignore_lid,
59 "Override lid status (0=autodetect, 1=autodetect disabled [default], "
60 "-1=force lid closed, -2=force lid open)");
62 module_param_named(powersave, i915.powersave, int, 0600);
63 MODULE_PARM_DESC(powersave,
64 "Enable powersavings, fbc, downclocking, etc. (default: true)");
66 module_param_named(semaphores, i915.semaphores, int, 0400);
67 MODULE_PARM_DESC(semaphores,
68 "Use semaphores for inter-ring sync "
69 "(default: -1 (use per-chip defaults))");
71 module_param_named(enable_rc6, i915.enable_rc6, int, 0400);
72 MODULE_PARM_DESC(enable_rc6,
73 "Enable power-saving render C-state 6. "
74 "Different stages can be selected via bitmask values "
75 "(0 = disable; 1 = enable rc6; 2 = enable deep rc6; 4 = enable deepest rc6). "
76 "For example, 3 would enable rc6 and deep rc6, and 7 would enable everything. "
77 "default: -1 (use per-chip default)");
79 module_param_named(enable_fbc, i915.enable_fbc, int, 0600);
80 MODULE_PARM_DESC(enable_fbc,
81 "Enable frame buffer compression for power savings "
82 "(default: -1 (use per-chip default))");
84 module_param_named(lvds_downclock, i915.lvds_downclock, int, 0400);
85 MODULE_PARM_DESC(lvds_downclock,
86 "Use panel (LVDS/eDP) downclocking for power savings "
89 module_param_named(lvds_channel_mode, i915.lvds_channel_mode, int, 0600);
90 MODULE_PARM_DESC(lvds_channel_mode,
91 "Specify LVDS channel mode "
92 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
94 module_param_named(lvds_use_ssc, i915.panel_use_ssc, int, 0600);
95 MODULE_PARM_DESC(lvds_use_ssc,
96 "Use Spread Spectrum Clock with panels [LVDS/eDP] "
97 "(default: auto from VBT)");
99 module_param_named(vbt_sdvo_panel_type, i915.vbt_sdvo_panel_type, int, 0600);
100 MODULE_PARM_DESC(vbt_sdvo_panel_type,
101 "Override/Ignore selection of SDVO panel mode in the VBT "
102 "(-2=ignore, -1=auto [default], index in VBT BIOS table)");
104 module_param_named(reset, i915.reset, bool, 0600);
105 MODULE_PARM_DESC(reset, "Attempt GPU resets (default: true)");
107 module_param_named(enable_hangcheck, i915.enable_hangcheck, bool, 0644);
108 MODULE_PARM_DESC(enable_hangcheck,
109 "Periodically check GPU activity for detecting hangs. "
110 "WARNING: Disabling this can cause system wide hangs. "
113 module_param_named(enable_ppgtt, i915.enable_ppgtt, int, 0400);
114 MODULE_PARM_DESC(enable_ppgtt,
115 "Override PPGTT usage. "
116 "(-1=auto [default], 0=disabled, 1=aliasing, 2=full)");
118 module_param_named(enable_psr, i915.enable_psr, int, 0600);
119 MODULE_PARM_DESC(enable_psr, "Enable PSR (default: false)");
121 module_param_named(preliminary_hw_support, i915.preliminary_hw_support, int, 0600);
122 MODULE_PARM_DESC(preliminary_hw_support,
123 "Enable preliminary hardware support.");
125 module_param_named(disable_power_well, i915.disable_power_well, int, 0600);
126 MODULE_PARM_DESC(disable_power_well,
127 "Disable the power well when possible (default: true)");
129 module_param_named(enable_ips, i915.enable_ips, int, 0600);
130 MODULE_PARM_DESC(enable_ips, "Enable IPS (default: true)");
132 module_param_named(fastboot, i915.fastboot, bool, 0600);
133 MODULE_PARM_DESC(fastboot,
134 "Try to skip unnecessary mode sets at boot time (default: false)");
136 module_param_named(enable_pc8, i915.enable_pc8, int, 0600);
137 MODULE_PARM_DESC(enable_pc8,
138 "Enable support for low power package C states (PC8+) (default: true)");
140 module_param_named(pc8_timeout, i915.pc8_timeout, int, 0600);
141 MODULE_PARM_DESC(pc8_timeout,
142 "Number of msecs of idleness required to enter PC8+ (default: 5000)");
144 module_param_named(prefault_disable, i915.prefault_disable, bool, 0600);
145 MODULE_PARM_DESC(prefault_disable,
146 "Disable page prefaulting for pread/pwrite/reloc (default:false). "
147 "For developers only.");
149 module_param_named(invert_brightness, i915.invert_brightness, int, 0600);
150 MODULE_PARM_DESC(invert_brightness,
151 "Invert backlight brightness "
152 "(-1 force normal, 0 machine defaults, 1 force inversion), please "
153 "report PCI device ID, subsystem vendor and subsystem device ID "
154 "to dri-devel@lists.freedesktop.org, if your machine needs it. "
155 "It will then be included in an upcoming module version.");