Comment 98 for bug 1705369

hi, i have this problem too
im using sony vaio vpceg38fg with nvidia 410m
but the screen is not black, its just turned off.
i have tried nvidia binary driver 384.111, 304.137, 340.104 none of them worked bug-free
nouveau work but i cannot change the brightness of the screen.

i have workaround that work, at least for me.
boot normally into ubuntu, few seconds after the screen turned off by itself press the power button on the laptop, which trigger sleep state.
wait few seconds, then push the power button again, and voila it worked!