[Bug 108651] New: Screen flickering when using compositor with OpenGL backend

[Bug 108651] New: Screen flickering when using compositor with OpenGL backend

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=108651

            Bug ID: 108651
           Summary: Screen flickering when using compositor with OpenGL
                    backend
           Product: Mesa
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: yshuiv7-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
        QA Contact: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org

Some users of both compton and nouveau have experienced screen flickering when
using the upgraded compton with GLX backend.

Nothing really changed in how compton uses OpenGL, so I suspect this could be a
driver bug.

For details, please go to: https://github.com/yshui/compton/issues/33

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[Bug 108651] Screen flickering when using compositor with OpenGL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=108651

--- Comment #1 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
How reproducible is this?

Is there an easy way for me, a non-compton user, to see these issues without
massive software installation? (Could I just run compton with windowmaker, for
example?)

What version of mesa did this work with? Or what was the change that
precipitates these issues?

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[Bug 108651] Screen flickering when using compositor with OpenGL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=108651

--- Comment #2 from Yuxuan Shui <yshuiv7-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
compton itself does not have lots of dependencies. Right now all the users
experienced this problem seems to be using the i3 window manager, I don't know
if this is reproducible with windowmaker.

I don't know the mesa version they use, I will ask. But judging that they are
all archlinux users, they are probably using mesa 18.2.4.

They started experiencing this issue when they upgraded their compton. One of
the reporters did a bisect (though he cannot reliably reproduce this problem)
and find out the bad commit seems to be
https://github.com/yshui/compton/commit/7af815a0aaaffc02e114e1d0adccb5f87dcc3548,
which touches nothing OpenGL related.

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Re: [Bug 108651] Screen flickering when using compositor with OpenGL backend

[Christ-Jan Wijtmans]

unsubscribe
On Mon, Nov 5, 2018 at 1:06 PM <bugzilla-daemon@freedesktop.org> wrote:
>
> Comment # 2 on bug 108651 from Yuxuan Shui
>
> compton itself does not have lots of dependencies. Right now all the users
> experienced this problem seems to be using the i3 window manager, I don't know
> if this is reproducible with windowmaker.
>
> I don't know the mesa version they use, I will ask. But judging that they are
> all archlinux users, they are probably using mesa 18.2.4.
>
> They started experiencing this issue when they upgraded their compton. One of
> the reporters did a bisect (though he cannot reliably reproduce this problem)
> and find out the bad commit seems to be
> https://github.com/yshui/compton/commit/7af815a0aaaffc02e114e1d0adccb5f87dcc3548,
> which touches nothing OpenGL related.
>
> ________________________________
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[Bug 108651] Screen flickering when using compositor with OpenGL backend

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=108651

--- Comment #3 from cj.wijtmans-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org ---
unsubscribe
On Mon, Nov 5, 2018 at 1:06 PM <bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org> wrote:
>
> Comment # 2 on bug 108651 from Yuxuan Shui
>
> compton itself does not have lots of dependencies. Right now all the users
> experienced this problem seems to be using the i3 window manager, I don't know
> if this is reproducible with windowmaker.
>
> I don't know the mesa version they use, I will ask. But judging that they are
> all archlinux users, they are probably using mesa 18.2.4.
>
> They started experiencing this issue when they upgraded their compton. One of
> the reporters did a bisect (though he cannot reliably reproduce this problem)
> and find out the bad commit seems to be
> https://github.com/yshui/compton/commit/7af815a0aaaffc02e114e1d0adccb5f87dcc3548,
> which touches nothing OpenGL related.
>
> ________________________________
> You are receiving this mail because:
>
> You are the QA Contact for the bug.
> You are the assignee for the bug.
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> Nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
> https://lists.freedesktop.org/mailman/listinfo/nouveau

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[Bug 108651] Screen flickering when using compositor with OpenGL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=108651

--- Comment #4 from Yuxuan Shui <yshuiv7-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
They confirmed they are using mesa 18.2.4

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[Bug 108651] Screen flickering when using compositor with OpenGL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=108651

--- Comment #5 from John Lindgren <john-ytntcHzVV1kcWVvVuXF20w@public.gmane.org> ---
This probably isn't specific to nouveau.  I am using Intel graphics
(modesetting driver) and I was also bitten by screen flickering in compton
after the switch to XCB (commits 43f3744fea07 and 7af815a0aaaf).

It is specific to DRI2.  With DRI3 or software rendering
(LIBGL_ALWAYS_SOFTWARE=1), the flickering goes away.

Looking at mesa source (src/glx/dri2.c), DRI2 seems to be incompatible with xcb
event processing due to usage of XESetWireToEvent()/XESetEventToWire(), which
hook into the traditional Xlib event processing.  Without Xlib in the loop,
DRI2 misses its Invalidate events and the result is that glXSwapBuffers()
doesn't work as expected.  (Take a look at src/glx/dri2_glx.c -
dri2XcbSwapBuffers() contains an explicit XSync() call to wait for Invalidate
events, which it never gets.)

One workaround I found is to change the following line in src/glx/dri2_glx.c:

   pdp->invalidateAvailable = (pdp->driMinor >= 3);

To this:

   pdp->invalidateAvailable = 0;

This causes mesa to think it's using an older X Server that doesn't send
Invalidate events and use some kind of internal fallback.  It's enough to make
the flickering go away, but I don't know what other side effects it has.

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[Bug 108651] Screen flickering when using compositor with OpenGL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=108651

--- Comment #6 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Note that by default, xf86-video-nouveau does not expose DRI3. There's a bit of
incompatibility between EXA and DRI3, which I'm told is unfixable (without
major changes to EXA).

This can be forced by adding

Option "DRI" "3"

in the Driver section.

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[Bug 108651] Screen flickering when using compositor with OpenGL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=108651

--- Comment #7 from Yuxuan Shui <yshuiv7-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
So the problem is actually a incompatibility between using xcb event loop and
mesa DRI2.

It is hacked around in compton.

More details in bug 108705

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[Bug 108651] Screen flickering when using compositor with OpenGL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=108651

Yuxuan Shui <yshuiv7-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |108705


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=108705
[Bug 108705] GLX with DRI2 doesn't work properly when xcb is owning the event
queue
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[Bug 108651] Screen flickering when using compositor with OpenGL backend

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Yuxuan Shui <yshuiv7-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |105132


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=105132
[Bug 105132] glxSwapBuffers has no effect
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[Bug 108651] Screen flickering when using compositor with OpenGL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=108651
Bug 108651 depends on bug 105132, which changed state.

Bug 105132 Summary: glxSwapBuffers has no effect
https://bugs.freedesktop.org/show_bug.cgi?id=105132

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

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[Bug 108651] Screen flickering when using compositor with OpenGL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=108651
Bug 108651 depends on bug 108705, which changed state.

Bug 108705 Summary: GLX with DRI2 doesn't work properly when xcb is owning the event queue
https://bugs.freedesktop.org/show_bug.cgi?id=108705

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

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[Bug 108651] Screen flickering when using compositor with OpenGL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=108651

GitLab Migration User <gitlab-migration-wf5LKTHn7b+es5Oj371l6A@public.gmane.org> changed:

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

--- Comment #8 from GitLab Migration User <gitlab-migration-wf5LKTHn7b+es5Oj371l6A@public.gmane.org> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/1164.

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