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SubjectRe: [Regression] Laptop screen dark when lid closed and reopened.with 3.1


>The following patch fixes the problem for me:

[ snip ]

>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.

> Thoughts?

Use this patch instead:

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)

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