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drm/radeon: add backlight quirk for hybrid mac

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Mac laptops with multiple GPUs apparently use the gmux
driver for backlight control.  Don't register a radeon
backlight interface.  We may need to add other pci ids
for other hybrid mac laptops.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=65377

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2013-06-10 09:57:07 -04:00
parent f100380ecd
commit 8010179067
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/radeon/atombios_encoders.c
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@ -186,6 +186,13 @@ void radeon_atom_backlight_init(struct radeon_encoder *radeon_encoder,
u8 backlight_level;
char bl_name[16];
/* Mac laptops with multiple GPUs use the gmux driver for backlight
* so don't register a backlight device
*/
if ((rdev->pdev->subsystem_vendor == PCI_VENDOR_ID_APPLE) &&
(rdev->pdev->device == 0x6741))
return;
if (!radeon_encoder->enc_priv)
return;