Ubuntu
xserver-xorg-video-intel package

  1. Bug #1573959
  2. Comment #108

Comment 108 for bug 1573959

Revision history for this message
Alexei Popov (alpprog) wrote :

System Description: Ubuntu 16.04.6 LTS
Linux 4.4.0-184-generic #214-Ubuntu SMP Thu Jun 4 10:14:11 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
LSB Version: core-9.20160110ubuntu0.2-amd64:core-9.20160110ubuntu0.2-noarch:printing-9.20160110ubuntu0.2-amd64:printing-9.20160110ubuntu0.2-noarch:security-9.20160110ubuntu0.2-amd64:security-9.20160110ubuntu0.2-noarch

Run into the same problem, after several hibernation - wake-up cycles.
Discovered recently than this bug is interconnected with corruption of active Xorg/Unity desktop GUI fonts family. In my case that was "Ubuntu*" fonts.

NEW FIX: works for the active user session, without loosing active processes/apps:
need to switch all themes' fonts to other (Verdana, etc.) than the active font set (Ubuntu *).
These are Default, Document, Monospace, Window header font.

One may accomplish this by using "unity-tweak-tool":
$ sudo apt install unity-tweak-tool
$ unity-tweak-tool
Open Fonts section ("abc" icon);
Change fonts;
Then refresh desktop, may need to restart some windows;
Also you may need to restart unity panel:
initctl restart unity-panel-service

Finding permanent fixes probably possible with fonts tweaking:
https://wiki.ubuntu.com/Fonts
Install alternative fonts, than do:
sudo fc-cache -f -v

However the bug could be related to runtime in-memory font cache corruption, and installing the alternative fonts will do nothing with the problem.