[Bug 198243] New: nouveau: X11 server hangs while DPMS active

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=198243

            Bug ID: 198243
           Summary: nouveau: X11 server hangs while DPMS active
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.12.12
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: kernelbugs at edsantiago.com
        Regression: No

Created attachment 261315
  --> https://bugzilla.kernel.org/attachment.cgi?id=261315&action=edit
Xorg.0.log

Symptom: DPMS is engaged, monitors off. Pressing keys has no effect.

System is alive. ssh'ing in, trying xdpyinfo (or any X command) on :0.0 results
in a hung client. Problem appeared between 4.9.34 and 4.12.12, sorry I can't
narrow it down further. It happens within a few hours of boot, and has never
hung while I'm actually doing something - only when I leave the keyboard and
come back to DPMS-blanked system.

Xorg server 1.19.5; hang has never happened on 4.9.34. It has happened twice in
the last 24 hours on 4.14.8.

strace on the X process yields rapid infinite loop of:

    ioctl(12, DRM_IOCTL_NOUVEAU_GEM_CPU_PREP, 0x7ffee9b26240) = ? ERESTARTSYS
(To be restarted if SA_RESTART is set)
    --- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---

There is absolutely nothing in /var/log/messages.

lspci reports the card as: 01:00.0 VGA compatible controller: NVIDIA
Corporation G96 [GeForce 9500 GT] (rev a1) (prog-if 00 [VGA controller])

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