[Bug 98631] New: GPU lock ups when starting GDM, SDDM, and Plasma Desktop

[Bug 98631] New: GPU lock ups when starting GDM, SDDM, and Plasma Desktop

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=98631

            Bug ID: 98631
           Summary: GPU lock ups when starting GDM, SDDM, and Plasma
                    Desktop
           Product: xorg
           Version: unspecified
          Hardware: PowerPC
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: jeffbai-ymACFijhrKM@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Here on a PowerMac G5 with a NVIDIA GeForce 6600LE graphics card, most things
run pretty well except for some of the things I wanted to run on the machine
resulted in nouveau GPU lock-ups, and consequently a glitched display
(artifacts only).

When trying to start GDM, SDDM, or Plasma Desktop on the machine, the display
locks up, and I was able to salvage an error message as follows:

[drm] nouveau 0000:0a:00.0: GPU lockup - switching to software fbcon

After a minute or two, the display responds again, but only showing a black
background with several randomly colored pixels, and some white blocks.

However, this graphics card runs LightDM, XFCE, MATE... and most other
applications without such error and lock-ups. I was able to workaround the
issue by using the nouveau.noaccel=1 kernel parameter (except in the case of
GDM, it returned with the same error), but that simply beats the purpose of
owning a graphics card.

However, even with the noaccel parameter in place, I was still experiencing bad
coloring issues, as reported here:
https://bugs.freedesktop.org/show_bug.cgi?id=98630.

----------

Some version info:

- Linux Kernel 4.8.6 (with 4K paging in case you are wondering)
- Mesa 13.0.0
- Xorg Server 1.18.4

----------

P.S.

I tried on with a Quadro FX4500, which simply shows the lock up error whenever
attempting to start X. But I couldn't make sure if it's a hardware issue or
not, as the card sparked on the first power up, that's why I have already
returned it...

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[Bug 98631] GPU lock ups when starting GDM, SDDM, and Plasma Desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=98631

--- Comment #1 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Without trying to defend the suckiness, the nv30 driver is kinda crap and WAY
lower quality than what these modern desktops expect. And that's on x86 -- BE
PPC is largely untested, although I have made some efforts to get it
kinda-working again.

Instead of booting with noaccel=1 you could try removing nouveau_dri.so. That
way you still get the X-based accel, but nothing tries to use 3D accel.

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[Bug 98631] GPU lock ups when starting GDM, SDDM, and Plasma Desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=98631

--- Comment #2 from Mingcong Bai <jeffbai-ymACFijhrKM@public.gmane.org> ---
(In reply to Ilia Mirkin from comment #1)
> Without trying to defend the suckiness, the nv30 driver is kinda crap and
> WAY lower quality than what these modern desktops expect. And that's on x86
> -- BE PPC is largely untested, although I have made some efforts to get it
> kinda-working again.

Please accept my applaud with your faster-than-light reply.

Where exactly could the latest efforts be obtained? I will be more than happy
to test out the results with my machine (also, if you would need SSH access, I
would quite happily provide that).

> Instead of booting with noaccel=1 you could try removing nouveau_dri.so.
> That way you still get the X-based accel, but nothing tries to use 3D accel.

I will try that later today, thanks very much!

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[Bug 98631] GPU lock ups when starting GDM, SDDM, and Plasma Desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=98631

--- Comment #3 from Mingcong Bai <jeffbai-ymACFijhrKM@public.gmane.org> ---
As a follow up, after removing nouveau_dri.so, I no longer get GPU lock up when
starting Plasma desktop.

However, I am still getting weird colors (for example, my KSplash setting has a
background of dark green color, but it showed up as bright blue, and there is a
black border around the KDE logo and the spinner (I will attach a photograph
when I get back to my room).

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[Bug 98631] GPU lock ups when starting GDM, SDDM, and Plasma Desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=98631

--- Comment #4 from poma <pomidorabelisima-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
Apropos Xfce 4.12, notice two variants of the Xfwm4:

= Xfwm4 4.12.3 "released" - Xrender driven compositor,
  it can be run on virtually any machine

$ xfwm4 --version
        ...
        Build configuration and supported features:
        - Render support:                               Yes
        - Embedded compositor:                          Yes


= Xfwm4 "not released" - GL(X) driven compositor,
  https://git.xfce.org/xfce/xfwm4/commit/?id=fee08ea
  it can run on NV50 family (Tesla),
  https://nouveau.freedesktop.org/wiki/CodeNames/#NV50
  on e.g. NV30 is slow, i.e. not very useful,
  although it may have to do with the performance of the CPU.

$ xfwm4 --version
        ...
        Build configuration and supported features:
        - Embedded compositor:                          Yes
        - Epoxy support:                                Yes



LightDM GTK+ Greeter (lightdm-gtk-greeter) is not accelerated,
therefore it can be run on virtually any machine.


KF5/KDE5 i.e. KWin also provides two variants of the compositor, GL and XRender
driven.


One important difference is that Xrender driven compositors aren't tear-free.

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[Bug 98631] GPU lock ups when starting GDM, SDDM, and Plasma Desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=98631

Tomasz Paweł Gajc <tpgxyz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |98039

--- Comment #5 from Tomasz Paweł Gajc <tpgxyz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
For me this sounds like #98039 related


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=98039
[Bug 98039] KMail crash on starting (nouveau-related)
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[Bug 98631] GPU lock ups when starting GDM, SDDM, and Plasma Desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=98631

Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|98039                       |


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=98039
[Bug 98039] KMail crash on starting (nouveau-related)
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[Bug 98631] GPU lock ups when starting GDM, SDDM, and Plasma Desktop

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https://bugs.freedesktop.org/show_bug.cgi?id=98631

caguduzexi-ybJNiJ/GDrisTnJN9+BGXg@public.gmane.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #6 from caguduzexi-ybJNiJ/GDrisTnJN9+BGXg@public.gmane.org ---
Quote: "After a minute or two, the display responds again, but only showing a
black background with several randomly colored pixels, and some white blocks."

Yes, this is exactly what i had on x86_64.
It would be great if you could create a gdb log. With such a log the developers
could see if its the same problem like i had here:

https://bugs.freedesktop.org/show_bug.cgi?id=102349

Side note: I had to change from tty to the x-server and move the mouse around
to cause a segfault error. Then change back to the tty and read out the gdb log
with "thread apply all bt"

Thanks

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https://bugs.freedesktop.org/show_bug.cgi?id=98631

--- Comment #7 from Mingcong Bai <jeffbai-ymACFijhrKM@public.gmane.org> ---
(In reply to caguduzexi from comment #6)
> Quote: "After a minute or two, the display responds again, but only showing
> a black background with several randomly colored pixels, and some white
> blocks."
> 
> Yes, this is exactly what i had on x86_64.
> It would be great if you could create a gdb log. With such a log the
> developers could see if its the same problem like i had here:
> 
> https://bugs.freedesktop.org/show_bug.cgi?id=102349
> 
> Side note: I had to change from tty to the x-server and move the mouse
> around to cause a segfault error. Then change back to the tty and read out
> the gdb log with "thread apply all bt"
> 
> Thanks

It will be two weeks before I could get to working with my PowerMac again. Will
try and produce one then.

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Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEEDINFO                    |RESOLVED

--- Comment #8 from Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> ---
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