[Bug 108703] Screen sometimes jumps to full brightness on resume from suspend

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Nov 14 08:30:47 UTC 2018


https://bugs.freedesktop.org/show_bug.cgi?id=108703

--- Comment #4 from Jani Nikula <jani.nikula at intel.com> ---
I don't think we have any fixes in drm-tip that should affect this; for that
matter I don't recall changes in the area that should regress either. Backlight
has been fairly solid for some years now.

1) Please paste the sysfs attributes *before* display gets disabled.

2) Is the behaviour reproducible if you don't go to minimum before disabling
display? I.e. stay at the next higher level. Or, use 

# echo 1 > /sys/class/backlight/intel_backlight/brightness

to stay above 0.

We do have a check in place to crank the brightness to max if it's at the
minimum upon encoder enable. However, that bit policy has been in place for
ages.

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