[Bug 67454] After suspend/resume, screen is black for all but the highest levels with i915 driver on MacBook Air 6,2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67454

--- Comment #37 from Jani Nikula <jani.nikula at intel.com> ---
If you change the brightness through
/sys/class/backlight/intel_backlight/brightness, do you have a full range from
dark to bright when trying values between 1860 and 2550?

e.g. su -c "echo 1860 > /sys/class/backlight/intel_backlight/brightness"

Please attach /sys/kernel/debug/dri/0/i915_opregion from the debugfs.

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