Radeon probably needs something similar. See attached untested patch.
Alex
On Sun, Jun 9, 2013 at 7:01 PM, Matthew Garrett matthew.garrett@nebula.com wrote:
Windows 8 leaves backlight control up to individual graphics drivers rather than making ACPI calls itself. There's plenty of evidence to suggest that the Intel driver for Windows doesn't use the ACPI interface, including the fact that it's broken on a bunch of machines when the OS claims to support Windows 8. The simplest thing to do appears to be to disable the ACPI backlight interface on these systems.
Signed-off-by: Matthew Garrett matthew.garrett@nebula.com
drivers/gpu/drm/i915/i915_dma.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 3b315ba..23b6292 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1661,6 +1661,9 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags) /* Must be done after probing outputs */ intel_opregion_init(dev); acpi_video_register();
/* Don't use ACPI backlight functions on Windows 8 platforms */if (acpi_osi_version() >= ACPI_OSI_WIN_8)acpi_video_backlight_unregister(); } if (IS_GEN5(dev))-- 1.8.2.1
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