[Bug 101976] glmark2 random blank or background only screen freeze over mesa3d 17.1 and 17.3 with radeon rx550 AMD POLARIS12

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=101976

--- Comment #5 from Pablo Estigarribia <pablodav@gmail.com> ---
After reading many many many pages around the web and trying everything I could
try I have got some config that doesn't crash with white/blank screen or
background screen. 

command tested: 

MESA_GL_VERSION_OVERRIDE=2.1 MESA_GLES_VERSION_OVERRIDE=2.0 MESA_NO_ERROR=1
MESA_EXTENSION_MAX_YEAR=2014 glmark2 

Looks like there is no guide for people new in debugging mesa3d, so I had to
spend lot of time looking on the web and trying to get tips to know what I can
try here. 

debugging tips doesn't helps for newcomers to mesa3d debuggin:
https://www.mesa3d.org/debugging.html 

First tried with some vars shown in: 

https://launchpad.net/~paulo-miguel-dias/+archive/ubuntu/mesa

I was also looking in the information shown here: 

https://www.x.org/wiki/RadeonFeature/#index12h2

Then finally used first test with: 

https://www.mesa3d.org/envvars.html

I have put the first command I tried, but still don't know what should I really
use. 

Probably the issue is with MESA_GL or MESA_GLES not fully implemented for the
version automatically recognized for the driver (from glxinfo not using the
vars to force the version): 

    Max core profile version: 4.5
    Max compat profile version: 3.0
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.1

Is there any documentation that could help me assign the bug-free GL version
should I use? 

I will be trying different versions until get the bigger and will comment
again.

I got blank screen also watching youtube videos, it seems to be some random bug
that I couldn't identify yet but hope this information could help some other
more familiar with mesa3d could.

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