Nouveau - Sep 2019 - [Bug 111841] New: Setting gamma or color temperature on GK104 causes horizontal artifacts / flickering

https://bugs.freedesktop.org/show_bug.cgi?id=111841

            Bug ID: 111841
           Summary: Setting gamma or color temperature on GK104 causes
                    horizontal artifacts / flickering
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: not set
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: brianclinkenbeard at protonmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 145545
  --> https://bugs.freedesktop.org/attachment.cgi?id=145545&action=edit
dmesg log

After setting the gamma or color temperature through various methods (redshift
-m randr, redshift -m drm, GNOME night shift on xorg or wayland) horizontal
artifacts begin to flicker. This does not severely obscure the screen but
appears as small lines horizontal lines flickering quickly. This notably does
not happen using the "vidmode" method of redshift
(https://github.com/jonls/redshift/blob/master/src/gamma-vidmode.c). I've
tested this on multiple displays.

The effect is more noticeable on darker backgrounds.

Steps to reproduce:
1) Use GK104/NVE0 on Xorg or Wayland.
2) Try to adjust color temperature or gamma with software such as redshift (-m
randr or drm).

I've attached the dmesg log, note that I am not certain the gnome-shell
segfaults have anything to do with this issue.

Kernel:
Linux desktop 5.2.0-2-amd64 #1 SMP Debian 5.2.9-2 (2019-08-21) x86_64 GNU/Linux

Card:
NVIDIA Corporation GK104 [GeForce GTX 770]

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--- Comment #1 from Brian Clinkenbeard <brianclinkenbeard at
protonmail.com> ---
Also note that this flickering is not similar to the flickering that occurs
when using nouveau without a compositor or vsync, and occurs on a static
screen.

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
We've recently started to implement more advanced color management handling,
however I think that's only bound for v5.4. I'm not sure if anything was
really
fixed in those, but it may be worth testing on latest if possible (e.g.
drm-next).

Can you also play with dithering mode? e.g. set it to "static 2x2"?

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--- Comment #3 from Brian Clinkenbeard <brianclinkenbeard at
protonmail.com> ---
(In reply to Ilia Mirkin from comment #2)
> We've recently started to implement more advanced color management
handling,
> however I think that's only bound for v5.4. I'm not sure if
anything was
> really fixed in those, but it may be worth testing on latest if possible
> (e.g. drm-next).
> 
> Can you also play with dithering mode? e.g. set it to "static
2x2"?
Setting dithering to 'static 2x2' fixes the issue. I will try testing
the 5.4rc
soon and see if that solves the issue as well.

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--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Wait, why is dithering even a thing here -- are you using 10bpc formats? Or do
you have a LVDS/eDP panel that can only do 6bpc?

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Martin Peres <martin.peres at free.fr> changed:

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

--- Comment #5 from Martin Peres <martin.peres at free.fr> ---
-- 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
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