http://bugzilla.kernel.org/show_bug.cgi?id=14997





--- Comment #34 from Takashi Iwai <ti...@suse.de>  2010-02-17 22:06:00 ---
(In reply to comment #32)
> I tested the patch. on closing the lid, the back-light turns off and directly
> on again  (with lid closed).
> 
> On opening the lid, the back-light turns off and directly on again

This can be rather due to the unstable acpi-lid state query.  Try to add debug
prints to show acpi_lid_open() values in intel_lvds_detect() and
intel_lid_notify() in drivers/gpu/drm/i915/intel_lvds.c.

If acpi_lid_open() isn't reliable, better to put your device to
bad_lid_status[] in intel_lvds.c.

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