YCbCr textures have chroma components swapped. This appears to be a driver issue, since it works correctly on another system with the ATI driver. Also, this is a regression from ubuntu feisty.
(--) Chipset 945GM found
Since you say textures, I assume this is with OpenGL apps? I just tested on a 945GM and the yuvsquare and yuvrect tests look fine. Can you clarify the environment you're seeing the problem in? What mesa version? What application?
I'm using http://www.schleef.org/~ds/xvideo_test, with xvimagesink changed to glimagesink. glimagesink has been tested on a wide variety of drivers and cards, and used to work on this card with an older driver.
mesa is 7.0.1-1ubuntu3
might be related with bug# 11478...
*** This bug has been marked as a duplicate of bug 11478 ***