Check your game card :)

UPDATE: GOG's version 1.0.0.3 doesn't have all the latest optimizations. Use this patch from Virtual Programming:
http://developer.vpltd.com/public/witcher2-gog-20140905125243.tgz

Does not seem to be working for me. I was able to download the ~20 GB file and extract it. I even got the launcher going by running start.sh.

However, trying to open the options menu from the launcher caused the launcher to minimize and restore itself. I was able to get the options menu working after running this command in terminal.

sudo apt-get install libsdl2-2.0-0:i386 libsdl2-image-2.0-0:i386 libcurl3-gnutls:i386 libwayland-egl1:i386

However, the launcher still does not launch the game when clicking the "Launch Game" button. Working on fixing that.

EDIT:

I was bale to fix the problem my navigating to the file location in Terminal, and running this command.

sudo bash start.sh

Then I clicked Launch Game and it worked.

On Debian I had to install a few packages:

libsdl2-2.0-0:i386 libgtk2.0-0:i386 libsdl2-image-2.0-0:i386 libcurl3:i386 libcurl3-gnutls:i386

Nice. Will try this weekend.

Sounds like a bad idea to run the game as root. It worked fine for me without sudo. What happens when you run start.sh as your regular user?

On Arch Linux I needed to copy/symlink some libraries from Steam Runtime and it works fine... However the performance is unplayable for me. Porting company promised more fixes connected to OpenGL threading - I'm waiting. ;)

On Debian I didn't need to use Steam runtime, it worked OK with standard libs. But a workaround was needed for missing speech in the dialogs (See https://github.com/KillaW0lf04/The-Witcher-2-Issues/issues/59).

Performance wise it was OK for me on a high end computer (Ubersampling off, the rest on max), but it's still slower than Wine + CSMT.

Apparently there's older then available version of W2 on GoG - as stated here: http://www.gamingonlinux.com/articles/the-witcher-2-for-linux-released-on-gog - porters gave small .tar.gz with only difference files. Still no luck for me (but I use GF 9800), but it seems it's pretty good for others.

GF 9800 is way too weak for it in general.

Well, I can run Witcher 2 on High + 1920x1080 on Windows with stable 40+ ;)

However I don't expect much from that non-native port, but one can hope.

Just installed the patch from VP (thanks for the pointer). It improved performance for me and now I don't see any difference with Wine + CSMT.

Didn't have much luck in OpenSUSE 13.1 :/

Some OpenSUSE related issues are discussed here: https://github.com/KillaW0lf04/The-Witcher-2-Issues/issues/8

Some other possibly related issued I found:
https://github.com/KillaW0lf04/The-Witcher-2-Issues/issues/2
https://github.com/KillaW0lf04/The-Witcher-2-Issues/issues/16


If yours is different, you can report that bug in https://github.com/KillaW0lf04/The-Witcher-2-Issues/issues/new

In what directory do i extract the patch?

And im geting this errors when trying to start the game.

../The Witcher 2 Assassins Of Kings/game % ./launcher :(
./launcher: line 5: [: : integer expression expected
./launcher: line 8: ./desktop-launcher: No such file or directory

../The Witcher 2 Assassins Of Kings/game % ./witcher2 :(
./witcher2: error while loading shared libraries: libSDL2_image-2.0.so.0: cannot open shared object file: No such file or directory

You have to install libSDL2_image package, the exact name depends on the distro. In OpenSUSE it's libSDL2_image-2_0-0.

As for the other error - I get the same error with the launcher with the unpatched GOG version.