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bbfa235
(Get the code!)
Not sure if exactly the same, but I have a similar issue with Loki on my MacBook Pro (Retina, 13-inch, Mid 2014).
- When I wake the computer from sleep the lock screen shows fine.
- After entering my password to unlock my session, the screen goes dark.
- Hitting either the screen brightness up or down key will restore the brightness to where it was when the computer was suspended (possibly +/- 1 step).