Ubuntu – Braid, Bastion showing black polygons


I just got the Humble Bundle 5 and am suffering severe graphical defects on Braid and Bastion. Both games run but do not display properly. Sound, mouse etc. work fine.
Here are some screens of Bastion:

Bastion graphic glitch
Bastion graphic glitch

I couldn't get a screen of Braid. I think its main problem is alpha support (all textures, even stair texttures etc., remain square and overlap the character).
I'm on Ubuntu 12.04 with a Mesa Intel 915g graphics card (according to Amnesia :), which has no support whatsoever for my card). Is there anything I can install/fix to remedy these graphical problems, or do I need to fork over the cash for a new graphics card?

Best Answer

This helped me.

sudo apt-get install libtxc-dxtn-s2tc0