it's like the screensaver doesn't work in the lock screen but wants to black the screen anyway.
So after the lockscreen is done (unlocked again), the screensaver remembers that it should have blacked the screen and does it then. After hitting a key, the screen comes back normaly. You haven't to wait.
My graphic:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
it's like the screensaver doesn't work in the lock screen but wants to black the screen anyway.
So after the lockscreen is done (unlocked again), the screensaver remembers that it should have blacked the screen and does it then. After hitting a key, the screen comes back normaly. You haven't to wait.
My graphic:
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
So not NVIDIA specific.
Cheers,
Thilo