[Nouveau] [Bug 80300] New: [NVE7] Fails to suspend on 3.15

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80300

          Priority: medium
            Bug ID: 80300
          Assignee: nouveau at lists.freedesktop.org
           Summary: [NVE7] Fails to suspend on 3.15
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: e.swanson+xorgbugs at alloscomp.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

After upgrading to:
Linux svoboda 3.15.1-1-ARCH #1 SMP PREEMPT Tue Jun 17 09:32:20 CEST 2014 x86_64
GNU/Linux

nouveau fails to suspend. The interesting dmesg lines are:
[ 1408.108662] nouveau E[   PDISP][0000:01:00.0][0xc000917c][ffff8804261aab80]
fini: 0xc2071088
[ 1408.108663] nouveau E[   PDISP][0000:01:00.0][0xc000917c][ffff8804261aab80]
failed suspend, -16

I have one output connected, an active DisplayPort -> DVI adapter to drive my
27" 2560x1440 monitor.

The card is a Quadro K2000M (NVE7 GK107).

When I was on linux 3.14 using this adapter, suspend worked, but it would fail
during resume - my display would not come back up, but restarting X would fix
it. Unfortunately, I never captured the dmesg from that. The following two
lines were present, however.

[54004.956815] nouveau E[   PDISP][0000:01:00.0] DP:0006:0f42: failed to read
DPCD
[54004.958586] nouveau E[   PDISP][0000:01:00.0] DP:0006:0f42: link training
failed

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