[Bug 101587] New: [BISECTED][REGRESSION] Nouveau kernel module (>4.10) on NVA8 renders the system unusable

[Bug 101587] New: [BISECTED][REGRESSION] Nouveau kernel module (>4.10) on NVA8 renders the system unusable

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=101587

            Bug ID: 101587
           Summary: [BISECTED][REGRESSION] Nouveau kernel module (>4.10)
                    on NVA8 renders the system unusable
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: otero.o.daniel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 132233
  --> https://bugs.freedesktop.org/attachment.cgi?id=132233&action=edit
Kernel dmesg without bug

It happens every single boot. The system becomes unresponsive seconds after
boot and the fan go to full speed until I force the system to shutdown.

Sometimes the screen stays completely black, other times it shows the console
login prompt (no X involved), but the system it's barely usable.

Bisected the offending commit, and resulted this one:

> commit 1e2115d8c0c0da62405400316f5499d909e479bc (refs/bisect/bad)
> Author: Alexandre Courbot <acourbot-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> Date:   Tue Dec 13 17:11:20 2016 +0900
>  
>     drm/nouveau/pmu: instanciate the falcon in PMU device

I attached the kernel logs with "nouveau.debug=debug" for both the previous and
the failing commit.

System details:
  > Arch Linux
  > CPU Intel Core i5 480M with Intel Integrated Graphics
  > GPU Nvidia GeForce 310M (with Optimus technology)

Thank you for your time.

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[Bug 101587] [BISECTED][REGRESSION] Nouveau kernel module (>4.10) on NVA8 renders the system unusable

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=101587

--- Comment #1 from Daniel Otero <otero.o.daniel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Created attachment 132234
  --> https://bugs.freedesktop.org/attachment.cgi?id=132234&action=edit
Kernel dmesg with bug

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[Bug 101587] [BISECTED][REGRESSION] Nouveau kernel module (>4.10) on NVA8 renders the system unusable

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=101587

Daniel Otero <otero.o.daniel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=101368

--- Comment #2 from Daniel Otero <otero.o.daniel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
I just find out what it seems to be a previous report of this bug 
(https://bugs.freedesktop.org/show_bug.cgi?id=101368).

But because it doesn't have a clear fix, I'm not sure is the same.

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[Bug 101587] [BISECTED][REGRESSION] Nouveau kernel module (>4.10) on NVA8 renders the system unusable

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=101587

--- Comment #3 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Yeah, possibly the same bug. But now with a bisect, so much more likely to get
fixed.

The issue is [probably] that the newly called function makes calls to
nvkm_falcon_rd32, which won't work at the ctor stage in optimus setups.

So that logic needs to be reworked. I believe that Ben Skeggs is on it (at
least we discussed it last night).

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[Bug 101587] [BISECTED][REGRESSION] Nouveau kernel module (>4.10) on NVA8 renders the system unusable

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=101587

Daniel Otero <otero.o.daniel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #4 from Daniel Otero <otero.o.daniel-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
The bug has been fixed some time ago and no longer occurs.

Thanks to all people involved.

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