exa broke xaa pixmap cache?

[Roland Scheidegger]

I've some issues when using good old xaa with the current radeon driver. 
After starting a 3d app, the background image gets broken. This only 
seems to happen when there isn't a lot of video memory available (I only 
noticed it because I've reduced the amount of pixmap cache the X server 
reserves but it happens with the "standard" code as well, if I reduce 
the memory of my card to 32MB instead of 64MB, which will cause it to 
allocate less than the default 5*framebuffer size). It's actually not 
100% broken, the background image on the desktop gets moved up by about 
30%, the upper 70% otherwise correct but the bottom 30% (e.g. the part 
which normally would be at the top) shows obvious tiling artifacts.

Not sure though if it was actually the exa patch causing this (it worked 
previously with a 2 week old build).

Roland