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Date: Mon, 14 Nov 2011 18:42:32 -0800 (PST) From: Alex Davis <alex14641@...oo.com> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org> Subject: [PATCH] i915: Fix bug where screen brightness is not restored From: Alex Davis<alex14641@...oo.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@...oo.com> Tested-by: Kamal Mostafa <kamal@...onical.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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