*** This bug is a duplicate of bug 1302264 ***
https://bugs.launchpad.net/bugs/1302264
This suddenly appeared for me as well.
I've been using compton's opengl backend for compositing and after booting up
today I got the same libGL permission errors and tearing on the desktop (due to
the software rendering mode fallback I assume). Then I noticed my user was not
in the 'video' group.
I did a "sudo usermod -a -G video <username>" and rebooted. That fixed the
issue for me.
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https://bugs.launchpad.net/bugs/1302270
Title:
[regression] Poor performance with recent update with i965: libGL
error: failed to open drm device: Permission denied
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