BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/568611 Override acpi brightness control with i915-opregion method. Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx> --- drivers/gpu/drm/i915/i915_opregion.c | 19 +++++++++++++++++++ 1 files changed, 19 insertions(+), 0 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_opregion.c b/drivers/gpu/drm/i915/i915_opregion.c index 7cc8410..a69033e 100644 --- a/drivers/gpu/drm/i915/i915_opregion.c +++ b/drivers/gpu/drm/i915/i915_opregion.c @@ -32,6 +32,9 @@ #include "i915_drm.h" #include "i915_drv.h" +unsigned int i915_brightness = 1; +module_param_named(brightness, i915_brightness, int, 0400); + #define PCI_ASLE 0xe4 #define PCI_LBPC 0xf4 #define PCI_ASLS 0xfc @@ -422,6 +425,18 @@ static void intel_didl_outputs(struct drm_device *dev) opregion->acpi->didl[i] = 0; } +static unsigned int i915_set_brightness(void *dev, unsigned int brightness) +{ + /* Nb. brightness value range is 0 to 255. */ + u32 bclp = ASLE_BCLP_VALID | brightness; + struct drm_device *drmdev = dev; + + if (IS_IRONLAKE(drmdev)) + return asle_set_backlight_ironlake(drmdev, bclp); + else + return asle_set_backlight(drmdev, bclp); +} + int intel_opregion_init(struct drm_device *dev, int resume) { struct drm_i915_private *dev_priv = dev->dev_private; @@ -469,6 +484,10 @@ int intel_opregion_init(struct drm_device *dev, int resume) DRM_DEBUG_DRIVER("ASLE supported\n"); opregion->asle = base + OPREGION_ASLE_OFFSET; opregion_enable_asle(dev); + /* Register the i915-based brightness control with ACPI */ + if (!resume && i915_brightness) + acpi_brightness_hook_register("i915", + i915_set_brightness, dev, 255); } if (!resume) -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
