[Bug 58840] New: rendering error with MSAA on HD6850

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bugzilla-daemon＠freedesktop.org

28 Dec 2012 28 Dec '12

9:04 p.m.

https://bugs.freedesktop.org/show_bug.cgi?id=58840

Priority: medium Bug ID: 58840 Assignee: dri-devel@lists.freedesktop.org Summary: rendering error with MSAA on HD6850 Severity: normal Classification: Unclassified OS: All Reporter: aaalmosss@gmail.com Hardware: Other Status: NEW Version: git Component: Drivers/Gallium/r600 Product: Mesa

There are weird rendering errors when OpenGL applications use MSAA framebuffer. The output is mostly noise. KDE 4.8 with OpenGL compositing is totally unusable this way.

It is also interesting, that MS visuals are only advertised in glxinfo, if I have the msaa-capable r600_dri.so installed on the system. If I only enable it via LIBGL_DRIVERS_PATH and LD_LIBRARY_PATH, they are not advertised, but still selectable. At least with __GL_FSAA_MODE=4 the applications are broken in the same way.

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bugzilla-daemon＠freedesktop.org

2 Jan 2 Jan

2:18 p.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #1 from Alex Deucher agd5f@yahoo.com --- Please attach your xorg log and dmesg output.

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bugzilla-daemon＠freedesktop.org

11:13 p.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #2 from almos aaalmosss@gmail.com --- (In reply to comment #1)

...

Please attach your xorg log and dmesg output.

The same as the ones at bug 58839

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bugzilla-daemon＠freedesktop.org

11:40 p.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #3 from almos aaalmosss@gmail.com --- Created attachment 72400 --> https://bugs.freedesktop.org/attachment.cgi?id=72400&action=edit neverball.png

The frames of Neverball are ok most of the time, but it flashes to garbage like in the attachment several times per second. The other applications I tried are sauerbraten and kde-window-manager, those are permanently garbage.

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bugzilla-daemon＠freedesktop.org

11:41 p.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

almos aaalmosss@gmail.com changed:

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bugzilla-daemon＠freedesktop.org

6 Jan 6 Jan

8:07 p.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #4 from almos aaalmosss@gmail.com --- Now I tried again with updated mesa (git-8ed6b14). Now glxgears, sauerbraten, ut2004 (32bit), fgfs (when did 3d clouds become such a performance killer?) are fine. Neverball still flashes garbage. Nexuiz is 3fps with AA. Etqw (32bit) and team fortress 2 (32bit, wine) cause gpu lockup even without AA (I'll bisect later). Alien-arena with AA dies with r600_texture.c:776:r600_texture_transfer_map: Assertion `rtex->resource.b.b.nr_samples <= 1' failed.

In all cases I had to use the env var, even games that support setting AA cannot do it themselves.

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bugzilla-daemon＠freedesktop.org

10:14 p.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #5 from almos aaalmosss@gmail.com --- Cogs also works, sort of. It has to be started with the __GL_FSAA_MODE=4 env var *and* antialias must be enabled in the options menu to see AA. However, it cannot start this way, it says Couldn't set 1280x960 OpenGL video mode: Couldn't find matching GLX visual on the next startup. The antialias has to be reset to 0 in ~/.local/share/Cogs/cogs.ini, and re-enabled in the menu. Additionally, there is a 90% chance of segfault on startup and on changing the antialias setting.

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bugzilla-daemon＠freedesktop.org

7 Jan 7 Jan

12:29 a.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #6 from Marek Olšák maraeo@gmail.com --- (In reply to comment #5)

...

Couldn't set 1280x960 OpenGL video mode: Couldn't find matching GLX visual on the next startup.

If you want MSAA GLX visuals, you must *install* the gallium driver and restart the X server for it to pick up the visuals.

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bugzilla-daemon＠freedesktop.org

9:51 a.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #7 from almos aaalmosss@gmail.com --- (In reply to comment #6)

...

(In reply to comment #5)

...
Couldn't set 1280x960 OpenGL video mode: Couldn't find matching GLX visual on the next startup.

If you want MSAA GLX visuals, you must *install* the gallium driver and restart the X server for it to pick up the visuals.

I know, but the last time I tried to install it, the whole screen became noise, like I said in the initial report.

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bugzilla-daemon＠freedesktop.org

24 Jan 24 Jan

11:32 p.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #8 from almos aaalmosss@gmail.com --- Now I tested things again, and I only see rendering errors with neverball.

I don't know if it is expected, but some games completely slow down to a few fps with msaa enabled (etqw, nexuiz), while others slow down only when lots of geometry is seen (sauerbraten). I still can't install the msaa-capable r600_dri.so, because of the kde-window-manager slowdown bug discussed at bug 55998, so I used the __GL_FSAA_MODE=4 env var for the tests.

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bugzilla-daemon＠freedesktop.org

25 Jan 25 Jan

12:33 p.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #9 from Marek Olšák maraeo@gmail.com --- (In reply to comment #8)

...

Now I tested things again, and I only see rendering errors with neverball.

I don't know if it is expected, but some games completely slow down to a few fps with msaa enabled (etqw, nexuiz), while others slow down only when lots of geometry is seen (sauerbraten). I still can't install the msaa-capable r600_dri.so, because of the kde-window-manager slowdown bug discussed at bug 55998, so I used the __GL_FSAA_MODE=4 env var for the tests.

Does the slowdown happen with the latest kernel from Linus Torvalds's git?

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bugzilla-daemon＠freedesktop.org

5:35 p.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #10 from almos aaalmosss@gmail.com --- (In reply to comment #9)

...

Does the slowdown happen with the latest kernel from Linus Torvalds's git?

Currently I use 3.6.4. I plan to upgrade to 3.7.4 this weekend. How stable is the git version? How do I check it out? Is 3.8-rc4 enough?

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bugzilla-daemon＠freedesktop.org

26 Jan 26 Jan

1:48 a.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #11 from Marek Olšák maraeo@gmail.com --- The latest kernel may be more stable for your graphics card. You can get it from:

git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git

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bugzilla-daemon＠freedesktop.org

29 Jan 29 Jan

12:16 a.m.

New subject: [Bug 58840] rendering error with MSAA on HD6850

https://bugs.freedesktop.org/show_bug.cgi?id=58840

--- Comment #12 from almos aaalmosss@gmail.com --- I happened to check out the git exactly at the tag 3.8-rc5 as HEAD. With that the preformance issues in etqw and nexuiz are gone. The neverball problem is still there though.

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