Messages in this thread | | | Date | Sat, 01 Nov 2014 14:41:07 +0100 | From | Ortwin Glück <> | Subject | [drm] 3.18 regression: backlight dark after resume |
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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@intel.com> 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@intel.com> Reviewed_by: Clinton Taylor <Clinton.A.Taylor@intel.com> Tested_by: Clinton Taylor <Clinton.A.Taylor@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Thanks,
Ortwin
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