[Nouveau] [Bug 77586] New: [NV98] On recent Linux kernel (3.13 and 3.14), the GPU locks up around the time an X server starts

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77586

          Priority: medium
            Bug ID: 77586
          Assignee: nouveau at lists.freedesktop.org
           Summary: [NV98] On recent Linux kernel (3.13 and 3.14), the GPU
                    locks up around the time an X server starts
        QA Contact: xorg-team at lists.x.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jkloos at mpi-sws.org
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Created attachment 97525
  --> https://bugs.freedesktop.org/attachment.cgi?id=97525&action=edit
dmesg output, as of running Linux 3.14

On my laptop, the GPU reproducably locks up when booting Linux 3.13 or 3.14.

Hardware set-up:
* NV98; lspci gives
  VGA compatible controller: NVIDIA Corporation G98M [Quadro NVS 160M] (rev a1)
* Dual-head set-up. One connected monitor is the laptop screen, the other
  is an HDMI monitor.
* x86-64 system (Dell Latitude E6400)

Software:
* The attached dmesg is from running Linux 3.14.1, as downloaded from
  kernel.org. I have applied a small patch as suggested by
  RSpliet and xexaxo^ on IRC.
* libdrm: Installed from Debian unstable, package version: libdrm-nouveau2
2.4.52-1
* Xorg: Also from Debian unstable, package version: 1:7.7+1 (i.e., Xorg 7.7).

Error description: During boot-up, an X server seems to start up. The
X server process is running, and the system switches to a fresh VT, but
it seems that graphics are not initialized at all, and the X server is stuck.
In particular, nothing remotely resembling a gdm session shows up, and the
keyboard is not responsive (except Magic Sysrq).
When switching to a console, a kernel message about a GPU lockup (see dmesg)
appears.

Furthermore, booting the system with an old kernel (verified for Linux 3.2.42,
using an old Debian package), X starts up normally.

Attached: dmesg output. I will add further information in additional messages.

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