SRU request LP#302421

[Colin Ian King]

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/302421

Hardy SRU justification:

Impact: i915 video driver: screen goes white, red, green or blue during
suspend/resume or hibernation

Fix: Backport upstream commits 39273b58a409cd6d65c9732bdca00bacd1626672
and a59e122a67b88925944d3bbf33d152

These commits fix flips the ARX register into index mode before
restoring the AR registers fix an off-by one save/restore index bug for
the AR and CR registers.

Testcase: Without the attached patch, the screen occasionally goes
completely white, red, green or blue during suspend/resume and
hibernate.  With patch the problem does not occur.


-- 
Colin King   <colin.king at canonical.com>
"Me transmitte sursum, caledoni" 
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