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I found a bug with Mesa.
It works fine as root but fails as normal user.
I have 2 reproduction cases.
You must have mesa-demos installed.

Case 1

glxinfo | head

name of display: :0
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: Version 4 or later of flush extension not found
libGL error: failed to load driver: i915
libGL error: MESA-LOADER: failed to retrieve device information
display: :0  screen: 0
direct rendering: Yes

But sudo glxinfo works correctly without any errors.

Case 2

glxgears

It gives the same errors as above and the gears don’t load.
After a while my desktop freezes.
OTOH sudo glxgears works.

(from redmine: issue id 7265, created on 2017-05-04, closed on 2017-06-01)

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