I'm experiencing what I think is the same problem. I'm on Ubuntu 12.04, with two monitors with twinview. One monitor is 1920x1080, and the other is 1280x1024. The symptoms are exactly as described here by another user:
http://askubuntu.com/questions/151337/screen-saver-issue Interestingly, the problem doesn't occur if you merely lock the screen. The problem only manifests if you also blank the screen. I can still move the mouse around the first screen, but it stops when I hit the border to the second screen. After I blindly enter my password, things go back to normal. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-screensaver in Ubuntu. https://bugs.launchpad.net/bugs/45018 Title: Unlock screen is invisible with Nvidia twinview Status in GNOME Screensaver: Fix Released Status in “gnome-screensaver” package in Ubuntu: Confirmed Bug description: Binary package hint: gnome-screensaver This bug may equally be an issue with the Nvidia GLX drivers or Xorg. When my laptop is configured with the following excerpt from xorg.conf, the gnome-screensaver unlock dialog does not appear. I haven't tested if the dialog box appears if a second monitor/projector is connected. Further symptoms include two screensavers seeming to run at the same time, sometimes one screensaver briefly appears over the top of the other. # Begin xorg.conf Section "Device" Identifier "NVIDIA Corporation NVIDIA Default Card" Driver "nvidia" BusID "PCI:1:0:0" Option "RenderAccel" "true" Option "Coolbits" "1" Option "ConnectedMonitor" "DFP,CRT" Option "TwinView" "1" Option "Metamodes" "1280x800,1280x800; 800x600,800x600; 1280x800,NULL" Option "UseEdidFreqs" "true" Option "SecondMonitorHorizSync" "30-96" Option "SecondMonitorVertRefresh" "50-160" Option "TwinViewOrientation" "Clone" EndSection # End xorg.conf I have disabled the ConnectedMonitor Option and all below it as a workaround while I do not have a second monitor connected. To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-screensaver/+bug/45018/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
