Nouveau - Jan 2017 - [Bug 99335] New: nouveau graphics often freezes when using KDE Plasma 5

https://bugs.freedesktop.org/show_bug.cgi?id=99335

            Bug ID: 99335
           Summary: nouveau graphics often freezes when using KDE Plasma 5
           Product: Mesa
           Version: 12.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: alexander.persh at gmail.com
        QA Contact: nouveau at lists.freedesktop.org

Created attachment 128839
  --> https://bugs.freedesktop.org/attachment.cgi?id=128839&action=edit
dmesg

Nouveau graphics on my system (Gentoo) often freezes with errors in dmesg. 

The system works fine for some time, but starts freezing at random intervals
(after 3 mins or 10 mins or 2 hours of work, etc) in random windows (chromium,
krusader, smplayer, login screen after auto-lock, etc) and a lot of artifacts
appear on the screen. After about 30 secs it freezes completely. My keyboard
does not react to any key combinations, mouse pointer moves with lags and mouse
buttons do not work so only hard reset helps.

For example, here are two photos of my frozen screen with artifacts:
http://i.imgur.com/vTbrNay.jpg
http://i.imgur.com/YIvEBGn.jpg

I wrote a script that saves dmesg to a file each 5 secs to get error logs.
Please find two examples with different errors attached.

I use the following versions of packages:
media-libs/mesa-12.0.1
x11-base/xorg-drivers-1.18-r1
x11-base/xorg-server-1.18.4
x11-drivers/xf86-video-nouveau-1.0.11
x11-libs/libdrm-2.4.70
sys-kernel/hardened-sources-4.7.10

My graphics card is Nvidia GeForce GTS 250 (G92 chip).

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--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
If you're interested in continuing to use KDE, I'd recommend adding
LIBGL_ALWAYS_SOFTWARE=1 to your environment, and unsetting it only for
applications that you want to actually use 3d accel. KDE + nouveau = fail for
now. I'm told that some newer versions of ... Qt? KDE? something? detect
nouveau and auto-disable the GL backends now. Not sure on the precise
specifics.

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Apparently Qt/KDE's threading can be disabled with

QSG_RENDER_LOOP=basic

Try putting that into /etc/environment and logging out/in (to make sure that
it's there).

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--- Comment #3 from Alexander <alexander.persh at gmail.com> ---
Thanks Ilia. Do you mean that I need to add both LIBGL_ALWAYS_SOFTWARE=1 and
QSG_RENDER_LOOP=basic to /etc/environment or either of them? By the way, any of
them slows down graphics processing so that watching Youtube or even scrolling
pages in browser becomes nightmare due to lags. How can I fight this?

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--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Try it with just

QSG_RENDER_LOOP=basic

in your /etc/environment. Note you need to log out/in in order for changes to
take effect.

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--- Comment #5 from Alexander <alexander.persh at gmail.com> ---
I have added QSG_RENDER_LOOP=basic to /etc/environment and then logged out/in,
but Chromium is still lagging. According to 'top', kwin_x11 consumes
about 90%
of CPU.

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--- Comment #6 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Does running "glxinfo" show that you're using nouveau or llvmpipe?

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--- Comment #7 from Alexander <alexander.persh at gmail.com> ---
# glxinfo | grep -E "nouveau | llvmpipe"
    Device: llvmpipe (LLVM 3.7, 128 bits) (0xffffffff)
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.7, 128 bits)

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--- Comment #8 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Alexander from comment #7)
> # glxinfo | grep -E "nouveau | llvmpipe"
>     Device: llvmpipe (LLVM 3.7, 128 bits) (0xffffffff)
> OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.7, 128 bits)
OK, so you're still using llvmpipe. You must have a LIBGL_ALWAYS_SOFTWARE=1
left somewhere. (check "env" to see whether that's the case.)

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--- Comment #9 from Alexander <alexander.persh at gmail.com> ---
Thanks. I have added the following to ~/.bashrc:
export "LIBGL_ALWAYS_SOFTWARE=1"

Then I checked 'env' as advised:

# env | grep QSG
QSG_RENDER_LOOP=basic
# env | grep LIBGL
LIBGL_ALWAYS_SOFTWARE=1

However, there is still llvmpipe in glxinfo output.

The system works with no lags, but it froze twice within 5 minutes. So now I
have the same as I had initially.

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--- Comment #10 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Alexander from comment #9)
> Thanks. I have added the following to ~/.bashrc:
> export "LIBGL_ALWAYS_SOFTWARE=1"
> 
> Then I checked 'env' as advised:
> 
> # env | grep QSG
> QSG_RENDER_LOOP=basic
That's good.
> # env | grep LIBGL
> LIBGL_ALWAYS_SOFTWARE=1
That's bad. You don't want this.

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--- Comment #11 from Alexander <alexander.persh at gmail.com> ---
Oh, I see. I thought you meant I should add this by saying "You must have a
LIBGL_ALWAYS_SOFTWARE=1 left somewhere." My apologies.

I have removed it and now I have 
# glxinfo | grep -E "nouveau | llvmpipe"
    Vendor: nouveau (0x10de)

Will test it for some time. Thank you.

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--- Comment #12 from Alexander <alexander.persh at gmail.com> ---
No, it froze again.

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GitLab Migration User <gitlab-migration at fdo.invalid> changed:

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

--- Comment #13 from GitLab Migration User <gitlab-migration at
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-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
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You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/1122.

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