The Witcher 2 graphical glitches

[scix]

The game performs nicely with a 6950, better than with CSMT even, but I'm getting some graphical glitches that don't occur with vanilla Wine or CSMT. Basically, grass flickers and looks unnatural and shadows tend to flicker on and off. There's also a cross hatching effect that you can see near the group in this screenshot:

I made a log with NINE_DEBUG=all WINEDEBUG=+d3d9,+d3dadapter:

https://www.dropbox.com/s/hr3mss5xh1huczl/witcher2-nine.txt.gz

Other games have graphical issues as well such as Oblivion, and I'll post a report for those too later if they are not known as of yet.

System summary:

Gentoo ~AMD64
AMD 6950
Mesa git - SB + nollvm set (no diff without)
libdrm git
xf86-video-ati git
linux-3.12-rc6

Thanks