http://bugs.freedesktop.org/show_bug.cgi?id=25159
Summary: Using s3tc causes the application to crash, or display
corrupt data with git r600 driver
Product: DRI
Version: DRI CVS
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Radeon
AssignedTo: dri-devel@lists.sourceforge.net
ReportedBy: p...@kantaka.co.uk
Using the git HEAD drm-radeon-testing merged with 2.6.32-rc7, git mesa and
xf86-radeon-driver (if it's relevant), I get either corrupt display or
application crashes if I turn on s3tc texture compression.
I'm aware that S3tc may not be supported in the radeon git driver, which is
fine, but in that case it should turn it off, not crash :)
I've actually had this problem for a while, but presumed it was simply that
there was something odd about my hardware that wasn't supported yet, but
happened to try turning off S3tc with driconf yesterday. The behaviour was the
same with a non KMS drm (just using the drm kernel modules from the drm-adg5f
git repository compiled against a stock Debian 2.6.3[01] kernel) except that
earlier releases resulted in corrupt textures on the screen menu from quake3,
followed by a crash at round start instead of the crash at startup that the
current checkout gives.
Hardware:
01:00.0 VGA compatible controller: ATI Technologies Inc RV730XT [Radeon HD
4670]
Behaviour: With S3tc turned on, quake3 crashes on startup with a sig11,
openarena crashes & has to be killed from a console. Penumbra runs but displays
just a single snow texture on the screen in the game.
source checkouts:
Mesa d3a37d93aba86ebca697169a31d88c3ef0ce34b9
xf86-video-ati 0c4710c67a2fee2061fc3da43c9f908585693cfa
drm (for libdrm): c20706ffe56cc658a4814f89e391c14f6065ec57
drm-radeon-testing: 984d1f3cd3308d176d6d14588836a87c94b340da
I'm using the libtxc_dxtn.so which ships with Debian unstable: it used to work
find with the old r300 driver on my old hardware, but hasn't been used for a
bit.
The simplest solution is presumably to just forcible disable S3tc in the r600
driver, although it would be nice to have the old r300 style code back (turn on
the extension, but use the external library for the actual texture compression
so that there are no patent issues for mesa).
cheers, Phil
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