I have encountered this one once more even though i had added the
workaround to the X session start sequence.

As I suspect that the GPU is completely reinitialized when suspending (I
do that a lot), I have now added it to the sleep/suspend sequence:

/etc/pm/sleep.d/20_intel_workaround
(do not forget to make it executable)
--------------

#!/bin/sh

case "$1" in
  hibernate|suspend) echo "Intel workaround";;
  resume|thaw)       intel_reg_write 0x2120 0x1206800;;
esac

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https://bugs.launchpad.net/bugs/975689

Title:
  X freezes completely running google earth on xserver-xorg-video-intel
  -   IPEHR: 0x7a000002

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