[Nouveau] [Bug 77371] New: [NVA3] gpu lockup unless noaccel=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77371

          Priority: medium
            Bug ID: 77371
          Assignee: nouveau at lists.freedesktop.org
           Summary: [NVA3] gpu lockup unless noaccel=1
        QA Contact: xorg-team at lists.x.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jw.hendy at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Created attachment 97262
  --> https://bugs.freedesktop.org/attachment.cgi?id=97262&action=edit
dmesg after normal startup on Arch x86_64, prior to startx

System details:

$ uname -a
Linux bigBang 3.14.0-4-ARCH #1 SMP PREEMPT Wed Apr 9 21:11:25 CEST 2014 x86_64
GNU/Linux

$ dmesg | grep -i chipset
[   19.583102] nouveau  [  DEVICE][0000:01:00.0] Chipset: GT215 (NVA3)

$ lspci |grep -i vga
01:00.0 VGA compatible controller: NVIDIA Corporation GT215GLM [Quadro FX
1800M] (rev a2)

Description:

I can only successfully `startx` if I modprobe nouveau with no acceleration
(`nouveau.noaccel=1` appended to kernel line or `options nouveau noaccel=1` in
/etc/modprobe.d/nouveau.conf).

With noaccel=0 (default), I get a GPU lockup message and borked X session (see
attached photo of screen).

Similar bugs:

- https://bugs.freedesktop.org/show_bug.cgi?id=33165 (seems most similar)
- https://bugs.freedesktop.org/show_bug.cgi?id=69488
- https://bugs.freedesktop.org/show_bug.cgi?id=73373 (?, can startx)
- https://bugs.freedesktop.org/show_bug.cgi?id=69203 (?, no gpu lockup)
- https://bugs.freedesktop.org/show_bug.cgi?id=69465 (?, no gpu lockup)

Things tried:
--- firmware: I tried the nouveau-fw packages from Arch Linux's AUR, which
simply packages the firmware instructions here:
http://nouveau.freedesktop.org/wiki/VideoAcceleration/. I have diff'ed the
contents of /lib/firmware/nouveau/ and /tmp/nouveau/vuc-* + /tmp/nouveau/nv*,
and they are identical.

>From what I can tell, NVA3 (NV50 Tesla family) shouldn't need 3D Accel firmware
(http://nouveau.freedesktop.org/wiki/InstallDRM/, 3D-accel firmware section):

"NV40 - NV50: No firmware needed. The Nouveau driver generates the ctxprogs and
related state internally (commits 48c6dfb8 and 266229a5)."

With firmware in /lib/firmware/nouveau, I've tried with and without
`nouveau.config=NvGrUseFW=1`, though per the Kernel Parameters page
(http://nouveau.freedesktop.org/wiki/KernelModuleParameters/), this only seems
relevant for NVC0.

--- Per bug 69488, I tried with `nouveau.rumpm=0` and still get the lockup, not
to mention that report suggests this is fixed in 3.13, and I'm on 3.14

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