[Bug 73528] New: Deferred lighting in Second Life causes system hiccups and screen flickering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73528

          Priority: medium
            Bug ID: 73528
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Deferred lighting in Second Life causes system hiccups
                    and screen flickering
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: sonichedgehog_hyperblast00 at yahoo.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/DRI/R600
           Product: Mesa

I compiled Mesa with libdrm from their GIT repositories (10.1, commit
2dc35a619c50139d07ad96fc4dfe456e5811c84e). I started up the Second Life viewer
through it (Kokua x64, 3.6.12.30743, Dec 12 2013 05:51:00) and logged in.

Upon enabling Advanced Lighting Model from Preferences - Graphics, the system
froze and the screen started flickering, turning black then recovering every
few seconds. The scene also got covered in pink pixels, meaning it also failed
to render correctly. I was barely able to move the mouse pointer and shut the
viewer down. Once I did, everything returned to normal.

This does not happen with Mesa 9.2.3, and other Graphics options in the viewer
work fine (like "Basic shaders" or "Atmospheric shaders"). Shadows were
disabled and likely not a cause.

If someone has Second Life, please try the deferred lighting system under the
10.1 development version of Mesa. Currently, I don't have any more information
on the problem apart from having experienced the described symptoms.

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