Comment 1 for bug 267570

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Bryce Harrington (bryce) wrote : Re: Dell C400 (i830) freezes in Hardy

Please include your /var/log/Xorg.0.log.

Offhand, this sounds like the pipe-A problem. Try setting this option in your xorg.conf:

  Section "Device"
      ...
      Option "ForceEnablePipeA" "true"
  EndSection

If that solves the issue let me know and I can put in a quirk for it.