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[axel <556782@xxxxxxxxxxxxxxxxxx>]

Apologies I have been too busy at work to test again until now
setting vblank_mode=0 with kms enabled seems to just delay the typical screen corruption that I can usually trigger in about 1min of draggng the glxgears window around the screen. 

with vblank_mode=0 it now takes ~5-10min before I can recreate the
screen corruption.

Incidentally I just tested with a Mobile X1300 and it does not have the
issue... so it seems specific to the X1200 RS690 !!

I did not realise that Ubuntu had shifted to the Gallium Driver... it
explains why it suddenly broke in 11.04 ... Thx Andre  :-)

Gives me more things test.

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https://bugs.launchpad.net/bugs/556782

Title:
  [rs690m] Graphics corruption with ati x1200