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[Vadim Radionov <question78177@xxxxxxxxxxxxxxxxxxxxx>]

Question #78177 on xorg in ubuntu changed:
https://answers.launchpad.net/ubuntu/+source/xorg/+question/78177

    Status: Open => Solved

Vadim Radionov confirmed that the question is solved:
Sam, I finally figured out the root of the problem (with a little help
from my friends).

It is in libxcb-xlib0, which was upgraded last time.  Downgrading it to
1.1-1ubuntu1 solved the problem totally.   The error message that gave
the hint was

../../src/xcb_lock.c:33:_XCBUnlockDisplay: Assertion `xcb_get_request_sent(dpy->xcb->connection) ==
dpy->request' failed

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