I use Fedora 19 with latest updates, DE is Gnome-Shell. I have two monitors: NEC MultiSync EA231WMi (1920 x 1080) and Samsung SyncMaster 943nwx (1440 x 900), video card is Nvidia GT 520 using nouveau driver. When user 1 logs in, everything works as expected. When user 1 locks his session (lock screen) and user 2 logs in, both monitors start to flicker in about 5 second interval. Pretty annoying. I've attached Xorg log file, but at least I can't find anything interesting there.
Created attachment 828401 [details] Xorg.1.log
Created attachment 828402 [details] Xorg.0.log
Forgot to mention that NEC in connected to DVI port and Samsung to VGA port.
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