[PATCH 3.17 108/122] drm/radeon: disable native backlight control on pre-r6xx asics (v2)

From: Greg Kroah-Hartman
Date: Fri Dec 05 2014 - 17:51:47 EST

3.17-stable review patch. If anyone has any objections, please let me know.


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


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;
use_bl = true;

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