[vtkusers] Many VTK build tests fail when run from Jenkins/Bamboo or VNC display, even when DISPLAY is set to good opengl-enabled display

[John]

aah, thanks muchly for the info Ben.

I'll see if I can find a mesa with floating point texture support on
rpmforge or somewhere, or build it myself & use LD_blah as you suggested.

Also. it does make me feel a little better knowing the DPMS issues are
due to a very nvidia-specific optimisation :-)

Cheers & regards,
John


On 2018-01-02 1:23 AM, Ben Boeckel wrote:
> On Mon, Jan 01, 2018 at 13:58:17 +1030, John wrote:
>> MESA_GL_VERSION_OVERRIDE=3.2 made a huge difference to running the tests
>> on vnc.
>>
>> With the override set, I'm able to run tests on vnc with only 102
>> failures, and most of those failures are from the TestGPURayCast group.
>> So there's obviously something about that group which doesn't like the
>> VNC/Mesa, but almost everything else is good.
> 
> Your Mesa build probably lacks floating point texture support. Most
> distros disable it due to patent licensing issues. Building it yourself
> (assuming a license) would suffice. I'd recommend *not* overwriting the
> system Mesa, but using LD_LIBRARY_PATH instead.
> 
>> I do find this situation incredibly frustrating and utterly depressing
>> though. Once again, I wonder why I ever began to use Linux. What sort of
>> utter garbage is this, when having a monitor turn off due to DPMS
>> suddenly breaks applications?!?!
> 
> This is nvidia behavior, not Linux/Mesa/etc. behavior (I have no such
> issues with the nouveau driver). Their driver "optimize" on-screen draws
> that aren't actually being displayed by just not doing them. You can see
> this if you overlap a window partially on top of a test window and see a
> black rectangle in that area. There may be some obscure setting in their
> settings app to disable this. If so, I'd like to know about it as well
> ;) (I haven't been in there in ages, so it may be new).
> 
> --Ben
>