[Bug 53130] New: 99c65ba breaks rendering (flickery, eventual fail)

[Bug 53130] New: 99c65ba breaks rendering (flickery, eventual fail)

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https://bugs.freedesktop.org/show_bug.cgi?id=53130

             Bug #: 53130
           Summary: 99c65ba breaks rendering (flickery, eventual fail)
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/r600
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: bugspam@moreofthesa.me.uk


I noticed broken rendering in mesa git fairly recently.

In Unvanquished (current release), the effect with its GL3 renderer is that the
display becomes more and more flickery, and eventually rendering apparently
ceases; the game remains otherwise responsive. Its GL ('vanilla' renderer, much
as in Tremulous) is unaffected.

Bisection points at the following commit; I've confirmed locally that git
master with this reverted does not exhibit the broken behaviour.

commit 99c65bac341f808279a8a847158ace4f058aa72e
Author: Marek Olšák <maraeo@gmail.com>
Date:   Sun Feb 26 20:37:43 2012 +0100

    r600g: implement wait-free buffer transfer for DISCARD_RANGE

    Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
    Reviewed-by: Christian König <christian.koenig@amd.com>

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[Bug 53130] 99c65ba breaks rendering (flickery, eventual fail)

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https://bugs.freedesktop.org/show_bug.cgi?id=53130

--- Comment #1 from Darren Salt <bugspam@moreofthesa.me.uk> 2012-08-04 21:09:24 UTC ---
Linux 3.5; HD6770.

01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI
Juniper XT [AMD Radeon HD 6000 Series] [1002:68ba]

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[Bug 53130] 99c65ba breaks rendering (flickery, eventual fail)

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https://bugs.freedesktop.org/show_bug.cgi?id=53130

Darren Salt <bugspam@moreofthesa.me.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |regression

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[Bug 53130] 99c65ba breaks rendering (flickery, eventual fail)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=53130

Marek Olšák <maraeo@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #2 from Marek Olšák <maraeo@gmail.com> 2012-08-15 17:30:17 UTC ---
The problematic code has been disabled in Mesa master. Closing.

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[Bug 53130] 99c65ba breaks rendering (flickery, eventual fail)

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https://bugs.freedesktop.org/show_bug.cgi?id=53130

--- Comment #3 from Darren Salt <bugspam@moreofthesa.me.uk> ---
I've rebuilt mesa with this re-enabled and I saw a lot of rendering glitches. I
suspect that DISCARD_RANGE being re-enabled is the problem, although I've also
built and installed an updated xf86-video-ati (cdf522f→20bfc65).

My current mesa build has 1eedebc reverted; I'll re-check with that undone
later.

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[Bug 53130] 99c65ba breaks rendering (flickery, eventual fail)

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https://bugs.freedesktop.org/show_bug.cgi?id=53130

--- Comment #4 from Andreas Boll <andreas.boll.dev@gmail.com> ---
(In reply to comment #3)
> I've rebuilt mesa with this re-enabled and I saw a lot of rendering
> glitches. I suspect that DISCARD_RANGE being re-enabled is the problem,
> although I've also built and installed an updated xf86-video-ati
> (cdf522f→20bfc65).
> 
> My current mesa build has 1eedebc reverted; I'll re-check with that undone
> later.

Do you still have the rendering glitches with enabled DISCARD_RANGE?
If so please reopen this bug.

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