The symptoms are exactly the same as for Bug 32393. However Xorg.0.log did not report an event queue overflow this time (for whatever reason).
Created attachment 41843 [details] /var/log/warn
Created attachment 41844 [details] /var/log/messages
Created attachment 41845 [details] Xorg.0.log
Is this still happening? Please actually report what the symptoms are rather than just saying it's similar to another bug (which in itself is overloaded with conflicting symptoms).
Yes; unfortunately it is. Now at server shutdown (Could not test if it still happens by xrandr config attempts because of bug 53840.). The backtrace did no more goe into Xorg.0.log but was merely visible on the tty. A reboot was necessary to get up X again (nothing to killall though tty7 locked).
Created attachment 65831 [details] backtrace as seen on terminal
Created attachment 65832 [details] Xorg.0.log before & without crash
Created attachment 65833 [details] Xorg -version KMS: kernel version 3.4.6-1.1-desktop.
This has only happend once. - and the traditional event queue overflow on xrandr requests is fully resolved (all my xrandr requests have succeeded well). Far not as bad as one could have assessed!
old report; bug was not observed for long any more.
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