https://bugs.freedesktop.org/show_bug.cgi?id=34427
--- Comment #11 from Harald Judt h.judt@gmx.at 2011-02-25 01:43:48 PST --- Thanks for pointing me to this. The symptoms looks indeed very similar, though I do not start X server with option -wm:
xinit /etc/X11/xinit/xinitrc -- /usr/bin/X -dpi 96 -auth /home/xxxxx/.serverauth.13388
Hopefully I will find some time next week to check this out.