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Subject[PATCH 094/145] drm/radeon: add backlight quirk for hybrid mac
Date
3.8.13.5 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@amd.com>

commit 80101790670385a85aca35ecae4b89e3f2fceecc upstream.

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>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
drivers/gpu/drm/radeon/atombios_encoders.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index 6cf2b52..8efd7e2 100644
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -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;

--
1.8.1.2


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