On Sat, 01 Nov 2014, Ortwin Glück <odi@xxxxxx> wrote: > Hi, > > Since 3.18-rc1 backlight is dark after resume from suspend. This is on a Samsung > laptop with i5 IvyBridge > > 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor > Graphics Controller (rev 09) > > > I have bisected this problem to the following commit: > 73580fb764c4213d305c0d36bd8f856ae631eb42 is the first bad commit > commit 73580fb764c4213d305c0d36bd8f856ae631eb42 > Author: Jani Nikula <jani.nikula@xxxxxxxxx> > Date: Tue Aug 12 17:11:41 2014 +0300 > > drm/i915/dp: make backlight bl_power control power sequencer backlight > > This lets the userspace switch off the backlight using the backlight > class sysfs bl_power file. The switch is done using the power sequencer; > the backlight PWM, and everything else, remains enabled. The display > backlight won't draw power, but for maximum power savings the encoder > needs to be switched off. > > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> > Reviewed_by: Clinton Taylor <Clinton.A.Taylor@xxxxxxxxx> > Tested_by: Clinton Taylor <Clinton.A.Taylor@xxxxxxxxx> > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx> See https://bugs.freedesktop.org/show_bug.cgi?id=80773 (please ignore comments up to #10 or so). Please attach dmesg with drm.debug=14 module parameter set, from boot to suspend/resume and the problem, running the debug patch from comment #18. Preferrably please attach the dmesg on the bug to keep everything in one place. Thanks, Jani. -- Jani Nikula, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
