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---------- Forwarded message ---------- From: Alex Davis alex14641@yahoo.com Date: Tue, Nov 15, 2011 at 12:42 AM Subject: [PATCH] i915: Fix bug where screen brightness is not restored To: "linux-kernel@vger.kernel.org" linux-kernel@vger.kernel.org, "torvalds@linux-foundation.org" torvalds@linux-foundation.org

From: Alex Davisalex14641@yahoo.com

This patch fixes an issue where the screen would remain dark when

a key was pressed when the laptop lid was reopened or after the laptop had gone into power-save mode.

It seems that there are a number of people with different machines that have this problem:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/872652 https://launchpad.net/~kamalmostafa/+archive/stuck-backlight and https://bugs.freedesktop.org/show_bug.cgi?id=41926

This patch is against Linux 3.1

Putting printk's in ./drivers/gpu/drm/i915/intel_panel.c showed that intel_get_brightness was being called after the panel was disabled, which caused a 0 to be saved as the value to restore the brightness. intel_panel_disable_backlight merely sets the brightness to 0. Commenting out this call allows the correct brightness value to be saved.

Signed-off-by: Alex Davis alex14641@yahoo.com Tested-by: Kamal Mostafa kamal@canonical.com ----- diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index a9e0c7b..6f56676 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -262,8 +262,6 @@ void intel_panel_disable_backlight(struct drm_device *dev)                 dev_priv->backlight_level = intel_panel_get_backlight(dev);                 dev_priv->backlight_enabled = false;         } - -       intel_panel_set_backlight(dev, 0);  }

void intel_panel_enable_backlight(struct drm_device *dev)

I code, therefore I am