linux-kernel - i915 wakes from suspend to RAM with blank screen after commit cd9dde44f47501394b9f0715b6a36a92aa74c0d0

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Date:	Sat, 21 Jan 2012 10:32:14 +0000 (UTC)
From:	Lubos Kolouch <lubos.kolouch@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: i915 wakes from suspend to RAM with blank screen after commit
 cd9dde44f47501394b9f0715b6a36a92aa74c0d0

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@...hat.com>
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@...hat.com>
    Signed-off-by: Keith Packard <keithp@...thp.com>

: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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