https://bugzilla.kernel.org/show_bug.cgi?id=54771
Milan Bouchet-Valat <nalimi...@club.fr> changed:
What |Removed |Added
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CC| |ti...@suse.de
--- Comment #3 from Milan Bouchet-Valat <nalimi...@club.fr> 2013-03-04
17:07:53 ---
Looking at the Changelog, this commit sounds like the most probable offender:
commit 719429a54d9c8fd32d457c7d564d1272d9003282
Author: Daniel Vetter <daniel.vet...@ffwll.ch>
Date: Wed Feb 6 11:24:41 2013 +0100
drm/i915: write backlight harder
commit cf0a6584aa6d382f802f2c3cacac23ccbccde0cd upstream.
770c12312ad617172b1a65b911d3e6564fc5aca8 is the first bad commit
commit 770c12312ad617172b1a65b911d3e6564fc5aca8
Author: Takashi Iwai <ti...@suse.de>
Date: Sat Aug 11 08:56:42 2012 +0200
drm/i915: Fix blank panel at reopening lid
changed the register write sequence for restoring the backlight, which
helped prevent non-working backlights on some machines. Turns out that
the original sequence was the right thing to do for a different set of
machines. Worse, setting the backlight level _after_ enabling it seems
to reset it somehow. So we need to make that one conditional upon the
backlight having been reset to zero, and add the old one back.
Cargo-culting at it's best, but it seems to work.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=47941
Cc: Takashi Iwai <ti...@suse.de>
Reviewed-by: Jani Nikula <jani.nik...@intel.com>
Acked-by: Takashi Iwai <ti...@suse.de>
Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
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