Bug#870641: light-locker: screen stays black after closing and opening laptop lid

[Thomas Maaß]

I have a similar Problem. But not only when hibernating. I have set up
to lock when the screensaver gets activated. I have no screensaver
installed, but configured a black screen. But this issue is not always.
Sometimes, the unlock screen appears as it should. Sometimes i can enter
my pw blind to get my desktop session again. And sometimes I have to
switch to the console and back to come back to desktop.
Now I installed xscreensaver with none acitvated to use this lock.
Needs further testing...