I have the same problem with nvidia-glx-legacy 1.0.7184+2.6.20.2-9.8 on
feisty running beryl and glxgears:
~$ glxgears
6954 frames in 5.0 seconds = 1390.729 FPS
6749 frames in 5.0 seconds = 1349.751 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)
Downgrading libx11-6 to the edgy version did this error disappear, but
then other dependency problems came up
--
c->xlib.lock
https://launchpad.net/bugs/87390
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