[Nouveau] [Bug 75813] New: [NV40] X hangs, system unresponsive

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75813

          Priority: medium
            Bug ID: 75813
          Assignee: nouveau at lists.freedesktop.org
           Summary: [NV40] X hangs, system unresponsive
        QA Contact: xorg-team at lists.x.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: marco at hulten.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/nouveau
           Product: xorg

Once every day or so my system practically hangs (gets extremely unresponsive;
X unusable; only SysRq magic working) while using Xorg with the nouveau driver
(version 1.0.10).

I am running Debian GNU/Linux testing (jessie) with

$ uname -r
3.13-1-amd64
$ lspci | grep VGA
05:00.0 VGA compatible controller: NVIDIA Corporation NV40 [GeForce 6800
GT/GTO/Ultra] (rev a2)

This problem did not occur when I ran Debian stable (with nouveau).

When the system (practically) hangs, I get messages like this:

... GPU lockup - switching to software fbcon
nouveau E [Xorg] failed to idle channel 0xcccc0000 [ ...

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