I've just downgrade xserver back to 2:1.17.3-2ubuntu4 (and the
input/video drivers to compatible previous versions) and no longer see
this bug on kernel 4.4.0-13-generic
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
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which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1555434
Title:
Black screen/system lockup on 4.4.0-11
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