Nouveau - Jun 2014 - [Bug 80300] New: [NVE7] Fails to suspend on 3.15

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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--- Comment #1 from e.swanson+xorgbugs at alloscomp.com ---
Created attachment 101448
  --> https://bugs.freedesktop.org/attachment.cgi?id=101448&action=edit
dmesg from 3.15

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--- Comment #2 from Tom Li <biergaizi at member.fsf.org> ---
possible duplicate: https://bugs.freedesktop.org/show_bug.cgi?id=80013

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--- Comment #3 from e.swanson+xorgbugs at alloscomp.com ---
eswanson at svoboda ~$ sudo cat /sys/kernel/debug/vgaswitcheroo/switch
0:DIS: :DynPwr:0000:01:00.0
1:IGD:+:Pwr:0000:00:02.0

I've always used bbswitch and multiple Xorg.conf files to manage my two
GPUs,
so I'm not sure how to interpret the above, but it doesn't look the same
as in
#80013.

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--- Comment #4 from e.swanson+xorgbugs at alloscomp.com ---
Alright, after a long troubleshooting session assisted by imirkin on #nouveau,
I tested the following configurations:

v3.15 from Linus's github tree: suspends fine, but has the "3.14"
error on
resume
linux-3.15.y from linux-stable tree: suspends fine, but has the "3.14"
error on
resume
drm-fixes from airlied's tree: fails to boot (hangs after loading initrd and
decrypting my drive, but before running anything on /. It may not be mounting
root. I'm using btrfs, and I don't know what the mount line in console
looks
like for that fs.)
drm-next from airlied's tree: works! no errors on suspend or resume.

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Since drm-next which allegedly worked eventually went into 3.16, I'm
assuming
all's well here. If not, feel free to reopen with updated info.

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