http://bugs.winehq.org/show_bug.cgi?id=31797
--- Comment #13 from Henri Verbeet hverbeet@gmail.com 2012-09-27 04:12:28 CDT --- While it's possible this is something completely unrelated, this bug looks similar enough to e.g. bug 30545 and a couple of other similar bugs that my guess would be that your libtxc_dxtn simply isn't getting picked up correctly, or something along those lines. Perhaps you can check /proc/<pid>/maps to see if it actually gets loaded at all.
(In reply to comment #12)
Why do you think it's not graphics card related? Try fglrx for the amd card, just to check if it works. On both cards, you are using the open source
While trying a different driver is good in principle to see if it makes a difference, installing fglrx generally doesn't make things better, and you have to be somewhat careful not to leave parts behind when uninstalling it again.