That is funny. For me everything worked fine after upgrading 14.04. The dual monitor set up works briliantly after using the additional driver package for ati radeon graphic card adapters (fglrxx-updates).
It stopped working and producing exactly the same behaviour after working on another issue with compiz (skydome, cube rotating not working properly under 14.04). After trying to fix that, it fails, and the dual monitor vanished after logging in, leaving two black blank screens. In the error log there were repeatedly the above mentioned message. The odd workaround works (plugging off), after changing from Terminal 8 to 7 again (ctrl-alt-F8 and then ctrl-alt-F7 again), then immediately the second monitor came back again.... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1124328 Title: *ERROR* failed to set mode on [CRTC:7] To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1124328/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
