Messages in this thread | | | Date | Mon, 10 Jun 2013 09:40:31 +0200 | From | Daniel Vetter <> | Subject | Re: [PATCH 3/3] i915: Don't provide ACPI backlight interface if firmware expects Windows 8 |
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On Sun, Jun 09, 2013 at 07:01:39PM -0400, Matthew Garrett 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>
Make sense and I guess it's easier to merge this all through the acpi tree. So
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> --- > 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 >
-- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch
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