ubuntu-x-swat team mailing list archive

[Marcerino <mastervanleeuwen@xxxxxxxxx>]

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
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