This is a note to let you know that I've just added the patch titled
drm/radeon: disable native backlight control on pre-r6xx asics (v2)
to the 3.17-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-disable-native-backlight-control-on-pre-r6xx-asics-v2.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b7bc596ebbe0cddc97d76ef9309f64471bbf13eb Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Wed, 19 Nov 2014 13:12:54 -0500
Subject: drm/radeon: disable native backlight control on pre-r6xx asics (v2)
From: Alex Deucher <alexander.deucher@xxxxxxx>
commit b7bc596ebbe0cddc97d76ef9309f64471bbf13eb upstream.
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@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon_encoders.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -179,6 +179,9 @@ static void radeon_encoder_add_backlight
(rdev->pdev->subsystem_vendor == 0x1734) &&
(rdev->pdev->subsystem_device == 0x1107))
use_bl = false;
+ /* disable native backlight control on older asics */
+ else if (rdev->family < CHIP_R600)
+ use_bl = false;
else
use_bl = true;
}
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-3.17/sound-radeon-move-64-bit-msi-quirk-from-arch-to-driver.patch
queue-3.17/drm-radeon-disable-native-backlight-control-on-pre-r6xx-asics-v2.patch
queue-3.17/drm-radeon-report-disconnected-for-lvds-edp-with-px-if-ddc-fails.patch
queue-3.17/gpu-radeon-set-flag-to-indicate-broken-64-bit-msi.patch
queue-3.17/drm-radeon-fix-endian-swapping-in-vbios-fetch-for-tdp-table.patch
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