[Bug 92101] New: face culling and alpha composition broken with Radeon driver in Kerbal Space Program 1.0.4

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Sep 24 05:09:58 PDT 2015


            Bug ID: 92101
           Summary: face culling and alpha composition broken with Radeon
                    driver in Kerbal Space Program 1.0.4
           Product: xorg
           Version: 7.6 (2010.12)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: kolAflash at kolahilft.de
        QA Contact: xorg-team at lists.x.org

Kerbal Space Program 1.0.4 introduced some new parts, like fairings/Airstream
Protective Shell. In difference to other (older) parts, those use "face
culling" and "alpha composition".



Those parts render fine on my notebook with Intel GPU. But on my desktop pc
with Radeon GPU the rendering fails.

$ /sbin/lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)



My notebook and my desktop pc use exactly the same software.

OS: openSUSE 13.2
Kernel: 3.16.7-24-desktop (by openSUSE 13.2)

Only real difference is, that my notebook got an Intel CPU+GPU and my desktop
PC got an AMD CPU and extra AMD GPU (see above). On both I'm using only the
open source drivers. When installing the closed source AMD GPU drivers on my
desktop pc, the problem is gone.

I also tested compiling and using the latest Mesa 11.0 library and installing
the latest Radeon drivers from here. But that didn't helped.



Had some discussion with a Kerbal Space Program developer in this forum.


Here's a bug report and 2 other forum threads.




For testing just start KSP (Kerbal Space Program), go into Sandbox mode, enter
the hangar, use a command capsule, one of the thinner fuel tanks and then put
an "Airstream Protective Shell" around it from below.

If you need a copy of KSP for testing, please let me or sal_vager know. I'm
pretty sure we can get one for you!


Unfortunately the KSP demo doesn't have those latest problematic parts. So you
won't be able to do a test with the demo.

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