We have uploaded a patch for the Linux version of The Witcher 2. Please download and install this patch at your earliest convenience :)
Workaround for AMD Catalyst's broken ARB_texture_storage support. We detect Catalyst and disable this extension, for now. AMD have told us that this will be fixed in their next driver release.
Change to memory management - a much smaller "reserve" section is used, and our heap manager now uses regular mmap() allocations. Limited inhouse testing seems to suggest this is more performant and better with large texture loads.
Thanks and have a nice day :)