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drm/radeon: add a backlight quirk for Amilo Xi 2550

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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>
This commit is contained in:
Alex Deucher 2014-09-17 11:31:02 -04:00
parent bc13018b5e
commit 8aff6ad5a3
1 changed files with 8 additions and 1 deletions
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7
drivers/gpu/drm/radeon/radeon_encoders.c
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@ -173,6 +173,13 @@ static void radeon_encoder_add_backlight(struct radeon_encoder *radeon_encoder,
} else if (radeon_backlight == 1) {
use_bl = true;
} else if (radeon_backlight == -1) {
/* 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;
}