[Nouveau] [Bug 100167] New: nouveau sometimes doesn’t resume properly from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100167

            Bug ID: 100167
           Summary: nouveau sometimes doesn’t resume properly from suspend
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: silverunicorn2011 at yandex.ru
        QA Contact: xorg-team at lists.x.org

Created attachment 130172
  --> https://bugs.freedesktop.org/attachment.cgi?id=130172&action=edit
dmesg output

It happens after resume; sometimes it does not happen. It seems to be more
likely if RAM is full, although I have enough swap space.

The symptom is that X applications refuse to start, hanging in `drm_stub_open`
(WCHAN column in `top`; status is `D` — “uninterruptible sleep”). I can’t even
`kill -9` them: the command succeeds but nothing happens.

The first app to hang seems to be the screen locker; it locks the session but
fails to present anything on the screen, so I have to go to VT2 and use
`loginctl`. But VT switch becomes unreliable: switching from X to console
succeeds at second attempt (while switching back seems to succeed always).

Also I just found one app hanging in `nouveau_drm_preclose` (`D` too),
consuming zero RAM. (pid=6455, noticed in the log)

It’s strange but already running applications usually continue to work
properly.

I’ve noticed several Oopses in the dmesg output, hope that data will be
helpful.

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