Bug#454304: Confirmed
I was having the same problem on my Toshiba S1800-400 laptop. So far,
however, I was able to run X by starting up with a 1280x1024 (IIRC)
resolution and using the fbdev driver, but that's _really_ sluggish.
Apt-pinning xorg to stable worked just now, and things run much more
smoothly.
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