I installed all updates in Feisty, but still the same error occures:
$ glxgears
36 frames in 5.0 seconds = 7.183 FPS
13 frames in 5.2 seconds = 2.477 FPS
XIO: fatal IO error 22 (Invalid argument) on X server ":0.0"
after 29 requests (29 known processed) with 0 events remaining.
glxgears: xcb_xlib.c:41: xcb_xlib_lock: Assertion `!c->xlib.lock' failed.
Aborted (core dumped)
--
c->xlib.lock
https://launchpad.net/bugs/87390
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