[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

            Bug ID: 101229
           Summary: Global screen tearing (scrolling, Hz miss-match?)
           Product: Mesa
           Version: 17.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: Paul.Hancock.17041993@live.com
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 131571
  --> https://bugs.freedesktop.org/attachment.cgi?id=131571&action=edit
glxinfo

System exhibits uncontrolled screen-tearing that can be seen when moving
windows, watching videos or playing games, or any graphical movement in
general. The tearing gradually shifts up or down the screen, suggesting its a
cycle frequency miss-match (or floating-point error).

Has affected mesa 12 and kernel 4.8 onwards.

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please attach the Xorg log file and the output of xrandr and dmesg
corresponding to the problem.

Can you create a video demonstrating the problem when moving windows? If not,
please describe which desktop environment / window manager / compositing
manager you're using.

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #2 from Paul <Paul.Hancock.17041993@live.com> ---
Created attachment 131583
  --> https://bugs.freedesktop.org/attachment.cgi?id=131583&action=edit
xorg

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #3 from Paul <Paul.Hancock.17041993@live.com> ---
Created attachment 131584
  --> https://bugs.freedesktop.org/attachment.cgi?id=131584&action=edit
display modes

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #4 from Paul <Paul.Hancock.17041993@live.com> ---
Created attachment 131585
  --> https://bugs.freedesktop.org/attachment.cgi?id=131585&action=edit
dmesg | radeon

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #5 from Paul <Paul.Hancock.17041993@live.com> ---
(In reply to Michel Dänzer from comment #1)
> Can you create a video demonstrating the problem when moving windows? If
> not, please describe which desktop environment / window manager /
> compositing manager you're using.

Don't think I can show a video as I don't have a high-end camera or capture
card, but it affects vanilla Kubuntu 16.10 and 17.04 at least.

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
Which rendering backend and tearing prevention method are selected in the kwin
settings?

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #7 from Paul <Paul.Hancock.17041993@live.com> ---
(In reply to Michel Dänzer from comment #6)
> Which rendering backend and tearing prevention method are selected in the
> kwin settings?

XRender and auto, I have tried the full-repaint but it didn't seem to have an
effect.

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
To prevent tearing, you need to either choose OpenGL instead of XRender and an
appropriate tearing prevention setting, or enable TearFree with

xrandr --output eDP --set TearFree on

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #9 from Paul <Paul.Hancock.17041993@live.com> ---
(In reply to Michel Dänzer from comment #8)
> To prevent tearing, you need to either choose OpenGL instead of XRender and
> an appropriate tearing prevention setting, or enable TearFree with
> 
> xrandr --output eDP --set TearFree on

it's less obvious, but there still appears to be screen tearing when running
via openGL 3.1 using full-screen-repaints.

It's also reasonably obvious that for some GUIs their buttons will update their
two triangles across two frames instead of one, this seems to be a much rarer
occurrence with the above settings however.

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #10 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Paul from comment #9)
> it's less obvious, but there still appears to be screen tearing

How does that manifest, and when you do what?

> when running via openGL 3.1 using full-screen-repaints.

FWIW, since DRI3 is enabled, "Re-use screen content" is the most efficient
setting.


> It's also reasonably obvious that for some GUIs their buttons will update
> their two triangles across two frames instead of one, this seems to be a
> much rarer occurrence with the above settings however.

Yeah, this is unavoidable with apps which use X11 drawing primitives targeting
their windows directly.

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #11 from Paul <Paul.Hancock.17041993@live.com> ---
(In reply to Michel Dänzer from comment #10)
> (In reply to Paul from comment #9)
> > it's less obvious, but there still appears to be screen tearing
> 
> How does that manifest, and when you do what?

Use the system and run OpenGL applications, is there an option to enable
triple-buffering or is it enabled by default?

> FWIW, since DRI3 is enabled, "Re-use screen content" is the most efficient
> setting.

I did have this enabled for a while, but plasma got super erratic after I had
launched a game, I'll give it another shot and see if it does it again.

I'm also going to try with 'allow applications to disable composition'
unchecked in case something was disabling the compositor...

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #12 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Paul from comment #11)
> Use the system and run OpenGL applications,

Fullscreen or windowed? Does enabling any sync-to-vblank functionality in the
apps or setting the environment variable vblank_mode=3 for running them help?


> is there an option to enable triple-buffering or is it enabled by default?

Automatically used with DRI3.

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #13 from katoflip@protonmail.com ---
I've also had this problem, I'm using the AMDGPU-experimental option that i've
enabled in the kernels because I'm on a R9 390x. I'm in Mesa 17.1 on Kernel
4.12.11 in KDE Manjaro Linux. I am using a display port and this happens both
at 144hz and 60hz. I've tried recording it using OBS, however, it did not show
up in the video. I've also tried using compton and enabling full-screen
reprints. Compton did not help at all, and enabling full-screen reprint v-sync
helped a small amount but did not stop it from happening. Switching between
Kwin and OpenGL 3.1 did not change anything.

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katoflip@protonmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #14 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Justin Mitzel from comment #13)
> I've also had this problem, 

How do you know it's the same problem? I still don't have a good idea what the
problem reported here looks like (and my last questions from comment 12 are
unanswered).


> I've tried recording it using OBS, however, it did not show up in the video. 

Can you take an external video (e.g. using a cell phone) demonstrating the
problem?

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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--- Comment #15 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Paul from comment #0)
> Has affected mesa 12 and kernel 4.8 onwards.

BTW, Paul, does this mean that the problem doesn't occur if you use Mesa < 12
or kernel < 4.8? If so, can you bisect Mesa or the kernel?

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #16 from Justin Mitzel <katoflip@protonmail.com> ---
(In reply to Michel Dänzer from comment #14)

> How do you know it's the same problem? I still don't have a good idea what
> the problem reported here looks like (and my last questions from comment 12
> are unanswered).

I suppose that is a good point. I don't really know but I figured it sounds
very similar. I also figured that posting here would be better than making a
new bug report. 

> > I've tried recording it using OBS, however, it did not show up in the video. 
> 
> Can you take an external video (e.g. using a cell phone) demonstrating the
> problem?

Here is a cellphone capture of the screen-tearing I'm talking about in Stardew
Valley. It is mostly happens indoors, and happens outdoors occasionally. 

https://vid.me/n0t1r

It also happens on the desktop sometimes, although (most likely) too rarely for
me to capture.

It also happens this noticeably in Torchlight II, if you would want me to
record that as well.

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[Bug 101229] Global screen tearing (scrolling, Hz miss-match?)

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #17 from Paul <Paul.Hancock.17041993@live.com> ---

> https://vid.me/n0t1r

Ok, that 'tearing' is in fact much different to what I've been seeing, in your
case it looks a lot more like *corruption* as entire chunks of buffer are being
rendered in random offset positions. I dont really know exactly what might
cause this, but I do know that running applications in fullscreen at a
different resolution to native can result in various buffer corruption...

(In reply to Michel Dänzer from comment #12)
> (In reply to Paul from comment #11)
> > Use the system and run OpenGL applications,
> 
> Fullscreen or windowed? Does enabling any sync-to-vblank functionality in
> the apps or setting the environment variable vblank_mode=3 for running them
> help?

Windowed, I rarely run things in fullscreen, of which it's usually borderless
windowed anyway. I don't remember if setting the vblank mode actually worked
though...

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https://bugs.freedesktop.org/show_bug.cgi?id=101229

--- Comment #18 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Justin Mitzel from comment #16)
> I also figured that posting here would be better than making a new bug report. 

I'm afraid that was the wrong call, please file your own report.

In general, it's easy to mark duplicate bug reports, but it's hard to untangle
information about different problems in a single report, so it's better to
start with a separate report unless one is at least 99% sure it's exactly the
same problem. Also, lots of different causes can produce similar symptoms.


> Here is a cellphone capture of the screen-tearing I'm talking about in
> Stardew Valley.

BTW, that's not what "tearing" refers to in the display context.

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

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

--- Comment #19 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- 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/1267.

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