[Nouveau] [Bug 81136] New: [NV92] Regression in Linux 3.15: GPU lockup after suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81136

          Priority: medium
            Bug ID: 81136
          Assignee: nouveau at lists.freedesktop.org
           Summary: [NV92] Regression in Linux 3.15: GPU lockup after
                    suspend
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: agustin at dallalba.com.ar
          Hardware: All
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 102508
  --> https://bugs.freedesktop.org/attachment.cgi?id=102508&action=edit
Logs for git kernel

After a suspend I get messages such as these: 

<3>[   39.550435] nouveau E[  PGRAPH][0000:01:00.0] PGRAPH TLB flush idle
timeout fail
<3>[   39.550435] nouveau E[  PGRAPH][0000:01:00.0] PGRAPH_STATUS  : 0x01000001
BUSY ROP
<3>[   39.550435] nouveau E[  PGRAPH][0000:01:00.0] PGRAPH_VSTATUS0: 0x00000000
<3>[   39.550435] nouveau E[  PGRAPH][0000:01:00.0] PGRAPH_VSTATUS1: 0x00000000
<3>[   39.550435] nouveau E[  PGRAPH][0000:01:00.0] PGRAPH_VSTATUS2: 0x00200000
ROP
<3>[   41.685486] nouveau E[     DRM] GPU lockup - switching to software fbcon

And if I was running X it crashes and the screen ends up looking like this:
http://imgur.com/a/D3VKw

This is always reproducible but only since Linux 3.15, so I ran a git bisect.
The first bad commit is [ecf24de071f4f6cea79ecef5d990794df5875ee1] drm/nouveau:
fix fbcon not being accelerated after suspend. After reverting the commmit the
machine resumes properly.

The issue persists in drm-nouveau-next (last commit 0b4e8e7... from Jul 8),
even if I boot with noaccel=1 nofbaccel=1.

Relevant IRC logs:
http://people.freedesktop.org/~cbrill/dri-log/index.php?channel=nouveau&highlight_names=Nitsuga&date=2014-07-09

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