This is a note to let you know that I've just added the patch titled
drm/radeon: add backlight quirk for hybrid mac
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-radeon-add-backlight-quirk-for-hybrid-mac.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 80101790670385a85aca35ecae4b89e3f2fceecc Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Mon, 10 Jun 2013 09:57:07 -0400
Subject: drm/radeon: add backlight quirk for hybrid mac
From: Alex Deucher <alexander.deucher@xxxxxxx>
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@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/atombios_encoders.c | 7 +++++++
1 file changed, 7 insertions(+)
--- 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 r
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;
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-3.10/drm-radeon-fix-avi-infoframe-generation.patch
queue-3.10/drm-radeon-add-backlight-quirk-for-hybrid-mac.patch
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