diff options
| author | Hans de Goede | 2021-11-03 15:26:20 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki | 2021-11-03 19:32:21 +0100 |
| commit | 60e6655f0a6c6e4604e4b89444e5fb8e3d43a67b (patch) | |
| tree | a18abd75c8dc9156f4fb991b4c90a492ce1e87e6 /drivers | |
| parent | 3b6740bdd53cb3713642942c5476fcb6969d57d8 (diff) | |
ACPI: video: use platform backlight driver on Xiaomi Mi Pad 2
The Xiaomi Mi Pad 2 is a Cherry Trail based x86 tablet which does not
use the i915's driver backlight control support:
i915 0000:00:02.0: [drm:intel_panel_setup_backlight [i915]] no backlight present per VBT
Like all Cherry Trail devices the ACPI tables on the Xiaomi Mi Pad 2
contain a broken ACPI-video implementation which causes 6 different
acpi_video backlights to get registered when used.
The lack of the i915 driver registering a BACKLIGHT_RAW (aka native) type
backlight causes acpi_video_get_backlight_type() to pick the broken
acpi_video backlight code as the backlight driver to use.
There actually is a separate lp8556 backlight controller connected
over I2C which gets registered as a BACKLIGHT_PLATFORM (aka vendor).
Add a quirk to force acpi_video_get_backlight_type() to return
acpi_backlight_vendor, so that the broken acpi_video backlight
interfaces do not get registered.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/video_detect.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index 7a1f8e823208..068e393ea0c6 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -154,6 +154,14 @@ static const struct dmi_system_id video_detect_dmi_table[] = { DMI_MATCH(DMI_PRODUCT_NAME, "VPCEH3U1E"), }, }, + { + .callback = video_detect_force_vendor, + /* Xiaomi Mi Pad 2 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"), + DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"), + }, + }, /* * These models have a working acpi_video backlight control, and using |