dri + ATI: dramatic performance slowdown

[Oliver Lehmann]

By the way:

- it also happens with the "radeon" driver (tried it once).
- It does not happen when I just exit Xorg normally, and then restart it.
- It only happens on switching while Xorg is running to console and then
  back to Xorg.
- While then back in Xorg, Xorg remains unkillable, sometimes I can see my
  mouesecursor (which I can move around) but the screen is not correctly
  re-initialized (I can see artifacts and sometimes the console output
  somewhere in the middle of the screen).

-- 
 Oliver Lehmann
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