Some more tests show that the problem is most likely in the 'DRI' subsystem; if I add 'option "DRI" "Off"' to my /etc/X11/xorg.conf, the switching works. I also tried NoMTRR and AIGLX Off, as suggested here: https://wiki.ubuntu.com/X/Troubleshooting/Freeze, but that doesn't help. 'DRI' seems to be the main culprit.
Also, the problem only occurs when switching using the 'Display' tool in System/Preferences (i.e. when X is running). If the monitor is connecting before logging in (during boot or during the process of logging out and going to the login screen), the external monitor is activated automatically and keeps working when X starts. -- [Karmic] X freezes when attaching external monitor https://bugs.launchpad.net/bugs/520046 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
