| From b7bc596ebbe0cddc97d76ef9309f64471bbf13eb Mon Sep 17 00:00:00 2001 |
| From: Alex Deucher <alexander.deucher@amd.com> |
| 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@amd.com> |
| |
| 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@amd.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| 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; |
| } |
