[Hardy] Blender's 3D viewport grid looks strange

[Johannes Langlotz]

Binary package hint: mesa, xserver-xorg-video-intel

If I switch from orthographic to perspective view (Numpad 5) the grid in the 3D viewport looks really strange.

[unggnu (unggnu)]

Couldn't it be a Blender problem?

[Brice Goglin (brice-goglin)]

Kyle Kearney and Jordi Gutiérrez Hermoso both report corrupted rendering on i965 with mesa 7.0.3-rc2. The problem did not occur with rc1 (Debian's 7.0.2-4).

Kyle said:
"I am experiencing graphics corruption in several 3D games since installing the
mesa 7.0.3-rc2 updates. A screenshot is attached illustrating the effect as it is
rather difficult to describe. I have observed this in supertuxkart, planet penguin
racer, armagetron, and open arena, both with and without compiz running. Glxgears
does not report any anomolies. My graphics processor is an Intel GMA x3100 (965
chipset)."

More details at the URL above, including a screenshot at http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=Mesaproblem.png;att=1;bug=470084

Brice

[Johannes Langlotz (johannes-langlotz)]

I doubt that because former Hardy versions had the same problem like gutsy has. This behaviour came with one of the last intel driver updates!

[Gordon Jin (gordon-jin)]

At least open arena works on my GM965.

[Mario-galanti (mario-galanti)]

Hi,

I can confirm that the bug is present if I use the 7.0.3-rc2 version of the mesa library; I use Debian testing and I have an i965 video card. If I try to play Vegastrike or Armagetron, I can see exactly the same kind of graphics corruption that is shown in the screenshot:

http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=5;filename=Mesaproblem.png;att=1;bug=470084

I have not tried other 3D games or apps, so I cannot say whether there are other programs affected by this bug on my system.

Also for me, the 7.0.2-4 (as named by Debian) version of the library produced no artefacts.

Kind regards,

Mario

[Gordon Jin (gordon-jin)]

*** Bug 14969 has been marked as a duplicate of this bug. ***

[kakukri (kakukri)]

I have the same bug on a Thinkpad R61i (with GM965). I think it is not a Blender bug, as it reminds me the rendering glitches I found in 3D games (see the attached screenshot). Johannes, could you try a simple 3D game (e.g. ppracer) to see if it renders OK or with glitches?

I think the bug is in the file i965_dri.so. I tried to replace it with the one in Gutsy, and it made those glitches disappear, however, it then froze the system when tried to play Torcs. As I happened to test an install of Frugalware, which has 7.0.2 version of mesa, and copying i965_dri.so from it fixed the rendering problems.

[kakukri (kakukri)]

Forgot to add my lspci output.

[kakukri (kakukri)]

Also my Xorg.log

[kakukri (kakukri)]

Now with the attachment :)

[kakukri (kakukri)]

Tried to experiment with earlier versions of mesa, and downgrading libgl1-mesa-dri and libgl1-mesa-glx to 7.0.2-4ubuntu2 solved the problems, while they are present with the 7.0.3~rc2 versions. Meanwhile I have found the easiest way to check if the problem is present is to open Screensaver Preferences, choose the screensaver 'Skyrocket', and if parts of the terrain disappear and/or bacame a triangle pointing towards the centre of the picture (see attached screenshot), the rendering problems are present.

On a sidenote, with 7.0.3~rc2-1ubuntu2 the z-buffer problems with the 'Endgame' screensaver (bug #162206) are again present.

[Johannes Langlotz (johannes-langlotz)]

I tested the screensaver and I have the same glitches.

[kakukri (kakukri)]

Added links to the corresponding Debian and Mesa bugs.

Until it gets fixed upstream, as a temporary hack using i965_dri.so from version 7.0.2-4ubuntu2 seems to work, even with libgl1-mesa-glx-7.0.3~rc2, at least so far I did not encounter instabilities with this combo.

[Otakar-trunecek (otakar-trunecek)]

Same bug in archlinux
http://bugs.archlinux.org/task/9866
Similar glitches in opengl games with mesa 7.0.3rc2 and intel graphics driver.

[Tristan (tristan-willy)]

Created an attachment (id=15574)
Re-enable -ve rhw workaround for all i965 chips.

[Tristan (tristan-willy)]

I noticed the same corruption in git (mesa_7_0_branch) and decided to track it down yesterday. The offending commit is da476ff02dd357d9909a2df9891ee645f5f776a0. It appears a workaround that was always on was changed to IGD chips only. It appears that my G965 requires this workaround, so here's a patch to include all i965 chips when executing the workaround. Patch included.

Regarding the patch, should the -ve rhw workaround even need a test? The DRI driver is for all 965 chips after all.

[Tristan (tristan-willy)]

Here's some before and after screenshots just to show the problem:

http://pc486.net/screenshot/mesa-7-0-g965-incorrect.png

http://pc486.net/screenshot/mesa-7-0-g965-correct.png

[Haihao-xiang (haihao-xiang)]

(In reply to comment #6)
> I noticed the same corruption in git (mesa_7_0_branch) and decided to track it
> down yesterday. The offending commit is
> da476ff02dd357d9909a2df9891ee645f5f776a0. It appears a workaround that was
> always on was changed to IGD chips only. It appears that my G965 requires this
> workaround, so here's a patch to include all i965 chips when executing the
> workaround. Patch included.
>
> Regarding the patch, should the -ve rhw workaround even need a test? The DRI
> driver is for all 965 chips after all.
>

Thanks . I make a mistake in that commit. The -ve rhw workaround should be applied to 965, not IGD

[Haihao-xiang (haihao-xiang)]

*** Bug 14794 has been marked as a duplicate of this bug. ***

[Christophe Dumez (hydr0g3n)]

The patch is available there: https://bugs.freedesktop.org/show_bug.cgi?id=14940

Couldn't you repackage libgl1-mesa-glx and apply this patch (please :)?

[Christophe Dumez (hydr0g3n)]

Just so you know. I repackaged mesa after applying the patch from the other bug report. My games are working fine again now :) I think it would really be nice if you packaged a patched version (or maybe a git snapshot) for Hardy. A lot of users have this video chipset...

[Andrew Oakley (andrew-aoakley)]

Example screenshot of this bug in OpenArena, Hardy with all updates to date.

[Bryce Harrington (bryce)]

A new 7.0.3 mesa was just now released; perhaps we should consider moving to that?

[Bryce Harrington (bryce)]

Not sure if this is included in 7.0.3 or not, but this is the patch that was applied upstream:

http://cgit.freedesktop.org/mesa/mesa/diff/?h=mesa_7_0_branch&id=1e83d70b6d07c7d3c61ee0ddf0de9420c167175d

Yay for 1 char bug fixes.

[Bernard Gatt (bengatt)]

Great guys! Thanks I had this same problem when running Open Arena / Wolfenstein ET. Had to downgrade mesa.
Again, Thanks.

[Kjell Braden (afflux)]

moved the affected package to mesa for the record, this was fixed with 7.0.3~rc2-1ubuntu3.

[Gordon Jin (gordon-jin)]

*** Bug 15351 has been marked as a duplicate of this bug. ***

[Andrew Oakley (andrew-aoakley)]

This now appears fixed for me in Open Arena. I wonder if it was xserver-xorg-video-intel and not mesa that was the games problem?