drm/radeon: add a backlight quirk for Amilo Xi 2550
Only the acpi backlight seems to work. Using the
radeon backlight controller causes the backlight to
go off.
bug:
https://bugs.freedesktop.org/show_bug.cgi?id=81382
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 2a9cd7b..15edf23 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -173,7 +173,14 @@
} else if (radeon_backlight == 1) {
use_bl = true;
} else if (radeon_backlight == -1) {
- use_bl = true;
+ /* Quirks */
+ /* Amilo Xi 2550 only works with acpi bl */
+ if ((rdev->pdev->device == 0x9583) &&
+ (rdev->pdev->subsystem_vendor == 0x1734) &&
+ (rdev->pdev->subsystem_device == 0x1107))
+ use_bl = false;
+ else
+ use_bl = true;
}
if (use_bl) {