I also get this problem. ATI HD 4670on 64 bit. User switching results in blank screen, and Ctrl+Alt+f1 / f2 etc doesn;t work. Neither does Alt+ SysRq+(anything). Machine is completely dead needing a power off.
This also happens when switching display - Ctrl+Alt+f1 is OK, but switching back to to GUI with Ctrl+Alt+f7 results in the same locked-up machine. -- black screen when switching between multiple X session https://bugs.launchpad.net/bugs/529882 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
