From: Yao Zi Date: Thu, 5 Jun 2025 12:34:46 +0000 (+0800) Subject: platform/loongarch: laptop: Get brightness setting from EC on probe X-Git-Tag: v6.16-rc1~12^2~2 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=1205088fd0393bd9eae96b62bf1e4b9eb1b73edf;p=linux-block.git platform/loongarch: laptop: Get brightness setting from EC on probe Previously during driver probe, 1 is unconditionally taken as current brightness value and set to props.brightness, which will be considered as the brightness before suspend and restored to EC on resume. Since a brightness value of 1 almost never matches EC's state on coldboot (my laptop's EC defaults to 80), this causes surprising changes of screen brightness on the first time of resume after coldboot. Let's get brightness from EC and take it as the current brightness on probe of the laptop driver to avoid the surprising behavior. Tested on TongFang L860-T2 Loongson-3A5000 laptop. Cc: stable@vger.kernel.org Fixes: 6246ed09111f ("LoongArch: Add ACPI-based generic laptop driver") Signed-off-by: Yao Zi Signed-off-by: Huacai Chen --- diff --git a/drivers/platform/loongarch/loongson-laptop.c b/drivers/platform/loongarch/loongson-laptop.c index 99203584949d..ba9a90818c92 100644 --- a/drivers/platform/loongarch/loongson-laptop.c +++ b/drivers/platform/loongarch/loongson-laptop.c @@ -392,8 +392,8 @@ static int laptop_backlight_register(void) if (!acpi_evalf(hotkey_handle, &status, "ECLL", "d")) return -EIO; - props.brightness = 1; props.max_brightness = status; + props.brightness = ec_get_brightness(); props.type = BACKLIGHT_PLATFORM; backlight_device_register("loongson_laptop",