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SubjectRe: [PATCH 3/3] i915: Don't provide ACPI backlight interface if firmware expects Windows 8
From
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
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
From c6ead3429fd3977b4b2ee5748d83c72272592b29 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Mon, 10 Jun 2013 10:05:43 -0400
Subject: [PATCH] drm/radeon: don't provide ACPI backlight if firmware expects
Windows 8

Windows 8 leaves backlight control up to individual graphics drivers rather
than making ACPI calls itself.

Untested.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/radeon/atombios_encoders.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index 4120d35..bc9e007 100644
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -233,6 +233,10 @@ void radeon_atom_backlight_init(struct radeon_encoder *radeon_encoder,

DRM_INFO("radeon atom DIG backlight initialized\n");

+ /* Don't use ACPI backlight functions on Windows 8 platforms */
+ if (acpi_osi_version() >= ACPI_OSI_WIN_8)
+ acpi_video_backlight_unregister();
+
return;

error:
--
1.7.7.5
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