i915 wakes from suspend to RAM with blank screen after commitcd9dde44f47501394b9f0715b6a36a92aa74c0d0

[Lubos Kolouch]

Hello,

After upgrading kernel from 3.1.5 to 3.2.0 the notebook cannot wake from
suspend to RAM properly. The problem stays even with 3.3-rc1.

It wakes, but the screen is blank and computer needs to be rebooted.

When woken, computer is working otherwise (can ping it, ssh to it etc.)

I git bisected it to commit
cd9dde44f47501394b9f0715b6a36a92aa74c0d0 is the first bad commit
commit cd9dde44f47501394b9f0715b6a36a92aa74c0d0
Author: Adam Jackson <ajax@xxxxxxxxxx>
Date:   Fri Oct 14 12:43:49 2011 -0400

    drm/i915/dp: Fix the math in intel_dp_link_required

    The previous code was confused about units, which is pretty reasonable
    given that the units themselves are confusing.

    Signed-off-by: Adam Jackson <ajax@xxxxxxxxxx>
    Signed-off-by: Keith Packard <keithp@xxxxxxxxxx>

:040000 040000 3c0a0f38fc6482a401340e03fa3fbd687d11eda4
294673b782b3ecc93540f46f7721d385bd30cfac M    drivers


Reproducible: Always

Steps to Reproduce:
1. suspend to RAM
2. start the computer
Actual Results:  
Screen is blank

Expected Results:  
Screen should be normal as before suspend

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