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drm/radeon: disable native backlight control on pre-r6xx asics (v2)

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Just use the acpi interface.  That's what windows uses on this
generation and it's the only thing that seems to work reliably
on these generation parts.

You can still force the native backlight interface by setting
radeon.backlight=1

Bug:
https://bugzilla.kernel.org/show_bug.cgi?id=88501

v2: merge into above if/else block

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher
2014-11-19 13:12:54 -05:00
parent bcfef97398
commit b7bc596ebb
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/radeon/radeon_encoders.c
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@ -179,6 +179,9 @@ static void radeon_encoder_add_backlight(struct radeon_encoder *radeon_encoder,
(rdev->pdev->subsystem_vendor == 0x1734) && (rdev->pdev->subsystem_vendor == 0x1734) &&
(rdev->pdev->subsystem_device == 0x1107)) (rdev->pdev->subsystem_device == 0x1107))
use_bl = false; use_bl = false;
/* disable native backlight control on older asics */
else if (rdev->family < CHIP_R600)
use_bl = false;
else else
use_bl = true; use_bl = true;
} }