Hardware: Radeon 6850

Software: 64bit Gentoo, game running via Wine (32bit), git versions of libdrm,
xf86-video-ati, kernel version 3.7(ish) and latest 3.8 rc + drm-next branch

The issue is affecting light effects, spell effects, etc. (see screenshots).

Bisecting leads to this commit:
commit 3b51d71c8544ee198008bbf3545bf3def6e9e77f
Author: Jordan Justen <jordan.l.justen@intel.com>
Date:   Fri Dec 28 11:00:50 2012 -0800

    copyteximage: check that sRGB usage is valid for GLES3 / GL

    Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
    Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>


There is already one bug report mentioning this commit [1], not sure if it's
the same issue.

Besides PoE, I also encontered similar problem in StarCraft2, I didn't checked
if it's the same problem, text/fonts on the loading screen shows the same
"corruption", however the game also hangs the GPU, so bisecting it might be a
bit problematic.

[1] https://bugs.freedesktop.org/show_bug.cgi?id=59690