A few other observations, gnome-screensaver only blanks the primary monitor - the other two monitors are not blanked and continue to function normally.
Even though the primary monitor is blanked, I can still see the mouse cursor when it moves across that monitor. I don't know if it is related, but I am also unable to run gnome- screensaver-preferences. A window flashes on the screen, but then the program exits with the following error message: e# gnome-screensaver-preferences (gnome-screensaver:7708): GnomeUI-WARNING **: While connecting to session manager: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed. gnome-screensaver-Message: Found best visual for GL: 0x21 The program 'gnome-screensaver' received an X Window System error. This probably reflects a bug in the program. The error was 'BadColor (invalid Colormap parameter)'. (Details: serial 232 error_code 12 request_code 1 minor_code 0) Note that the error text is the same as in the gnome-screensaver error, but the serial number is different. -- Lock Screen blanks screen instead of showing screensaver (on external monitor) https://launchpad.net/bugs/71030 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
