[kwin] [Bug 351700] kwin is frame skipping

[Nikos Chantziaras]

https://bugs.kde.org/show_bug.cgi?id=351700

Nikos Chantziaras  changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution|--- |WONTFIX

--- Comment #54 from Nikos Chantziaras  ---
Closing. I don't care anymore.

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[kwin] [Bug 351700] kwin is frame skipping

[Nikos Chantziaras via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351700

--- Comment #53 from Nikos Chantziaras  ---
Well, turns out 61 doesn't work for 1080p video. Or even slightly higher values
(62, 63). It works only for lower resolutions. I've set MaxFPS=70 and
RefreshRate=70 to get stutter-free 1080p@60FPS.

The driver version doesn't seem to matter, btw. 352.63, 355.11 and 358.16 all
exhibit the problem. I didn't try 361.x versions yet, because they seem to
break KDE and a lot of Qt applications so I'll have to wait for things to be
sorted out first.

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[kwin] [Bug 351700] kwin is frame skipping

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351700

--- Comment #49 from Thomas Lübking  ---
PS, does the same problem also occur for glxgears (or is it limited to video
playback)

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[kwin] [Bug 351700] kwin is frame skipping

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351700

--- Comment #48 from Thomas Lübking  ---
That's pretty interesting as we didn't change anything itr (except for the
patch in comment #31, which you already tried and which doesn't apply on TB
anyway)

What happens if you raise the desired swap frequency (as in comment #17, feel
free to try even higher values)

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[kwin] [Bug 351700] kwin is frame skipping

[Nikos Chantziaras via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351700

--- Comment #50 from Nikos Chantziaras  ---
> What happens if you raise the desired swap frequency (as in comment #17, feel 
> free to try even higher values)

OK, I tried 70 and it works! No stutter, but there's input lag. I've tried 61
and it works too, and without the input lag of 70.

I then tried 60.1, 60.2, 60.9, but none work. It doesn't like fractional
numbers (which is weird, because some monitor modes ARE inherently fractional;
like 47.952Hz (for 23.976FPS video content.)

> PS, does the same problem also occur for glxgears (or is it limited to video 
> playback)

Hm, glxgears doesn't seem to suffer. It's only video that does.

But thank you for pointing out comment #17 again. I somehow missed it
completely. You just saved me hours of messing around with installation and
setup of other window managers :-)

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[kwin] [Bug 351700] kwin is frame skipping

[Nikos Chantziaras via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351700

Nikos Chantziaras  changed:

   What|Removed |Added

Version|5.5.2   |5.5.3

--- Comment #51 from Nikos Chantziaras  ---
Btw, since nothin

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[kwin] [Bug 351700] kwin is frame skipping

[Nikos Chantziaras via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351700

--- Comment #52 from Nikos Chantziaras  ---
Btw, since nothing changed in kwin, this has to be a side effect of the GPU
upgrade? I wonder if rendering speed matters. I had a 780 before, which is
already very fast GPU, and the 980 Ti I have now is even faster than that.
Could it be that there's some bug that only triggers when rendering
times/latency are very low?

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[kwin] [Bug 351700] kwin is frame skipping

[Thomas Lübking via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351700

--- Comment #46 from Thomas Lübking  ---
I beg your pardon?
Did anything else change compared to comments #29 and following?

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[kwin] [Bug 351700] kwin is frame skipping

[Nikos Chantziaras via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351700

--- Comment #45 from Nikos Chantziaras  ---
Video now went from borderline unwatchable to actually unwatchable after a KDE
Plasma update (going to kwin 5.5.2. I also upgraded my GPU to a GTX 980 Ti.

The frame skipping in video is now so extreme, you can see frames flickering
back and forward all the time. Doesn't matter if I watch a video with mpv or
with Chrome's HTML5 video player on YouTube.

It is so bad where I'm now looking at how to switch my system from KDE to
something else, after 17 years of KDE use :-(

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[kwin] [Bug 351700] kwin is frame skipping

[Nikos Chantziaras via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351700

--- Comment #47 from Nikos Chantziaras  ---
Yes. It now has extreme frame skipping even with __GL_YIELD="USLEEP" and TB.

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[kwin] [Bug 351700] kwin is frame skipping

[Nikos Chantziaras via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351700

Nikos Chantziaras  changed:

   What|Removed |Added

Version|5.4.2   |5.5.2

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