On Thu, 22 May 2014, Marc Milgram <mmilgram@xxxxxxxxxx> wrote: > After upgrading to linux Kernel-3.14, the screen on my Dell Latitude > D630 was nearly unreadably dim. When I Boot the 3.13 kernel, my screen > is bright. Please file a new bug on DRM/Intel at [1]. Please attach /sys/kernel/debug/dri/0/i915_opregion and dmesg with drm.debug=0xe module parameter set. Also include info whether max_brightness changes for you between 3.13 and 3.14. Do the later 3.15-rc kernels work for you? BR, Jani. [1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI > > I opened a Bug here: https://bugzilla.redhat.com/show_bug.cgi?id=1094066 > and others have chimed in that they have the same problem. > > I bisected the kernel, and found the following commit is responsible for > this problem: > > b35684b8fa94e04f55fd38bf672b737741d2f9e2 is the first bad commit > commit b35684b8fa94e04f55fd38bf672b737741d2f9e2 > Author: Jani Nikula <jani.nikula@xxxxxxxxx <mailto:jani.nikula@xxxxxxxxx>> > Date: Thu Nov 14 12:13:41 2013 +0200 > > drm/i915: do full backlight setup at enable time > > We should now have all the information we need to do a full > initialization of the backlight registers. > > v2: Keep QUIRK_NO_PCH_PWM_ENABLE for now (Imre). > > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx <mailto:jani.nikula@xxxxxxxxx>> > Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx <mailto:imre.deak@xxxxxxxxx>> > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx <mailto:daniel.vetter@xxxxxxxx>> > > :040000 040000 0aae5515ca62ff1bfd2e1c2769e30c58b016ffeb 01c2f8cd145f8cf29730908d52e7e89b787a059e M drivers > > I can find my way around the kernel, but haven't hit this area before. > > Any help is appreciated. > > Marc Milgram > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > http://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
