With Ubuntu 15.04 and the newest 4.1.0-040100rc1-generic kernel, the bug
is completely fixed.
** Changed in: xorg (Ubuntu)
Status: Invalid => Fix Released
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1314213
Title:
[Lenovo ThinkPad X220] External DP1 monitor extremely unstable since
upgrade to 14.04
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