[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=383023

tempel.jul...@gmail.com changed:

   What|Removed |Added

 Resolution|WAITINGFORINFO  |FIXED
 Status|NEEDSINFO   |RESOLVED

--- Comment #14 from tempel.jul...@gmail.com ---
KWin compositing is fine nowadays. :)

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=383023

kde@grau.net changed:

   What|Removed |Added

 Resolution|--- |WAITINGFORINFO
 Status|REPORTED|NEEDSINFO
 CC||kde@grau.net

--- Comment #13 from kde@grau.net ---
This issue report is quite old. Can you please confirm, that it still persists
with KDE 5.23?

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=383023

tempel.jul...@gmail.com changed:

   What|Removed |Added

 Status|NEEDSINFO   |UNCONFIRMED
 Resolution|WAITINGFORINFO  |---

--- Comment #12 from tempel.jul...@gmail.com ---
Closing, as continued here:
https://bugs.kde.org/show_bug.cgi?id=397850

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=383023

--- Comment #11 from tempel.jul...@gmail.com ---
*wanted to say "connection" and not "detection".

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=383023

tempel.jul...@gmail.com changed:

   What|Removed |Added

Version|5.10.3  |5.13.4
 Resolution|--- |WAITINGFORINFO
 Status|UNCONFIRMED |NEEDSINFO

--- Comment #10 from tempel.jul...@gmail.com ---
Would it be possible that this gets reviewed again?
Let's keep mpv out of it as there seem to be other Intel issues with it.

But Firefox with OpenGL rendering should scroll absolutely stutter free, which
is not the case with KWin X11 compositing on neither Radeon or Intel graphics.

It seems there is a detection to triple buffering, as changing the option to 0
already helps a lot (but also increases additional altency).

Firefox scrolling in a Gnome X11 session is stutter free and Mutter/Gnome Shell
also has low input latency at the same time.

Not even e.g. moving Dolphin's window is stutter free with KWin X11 and free
drivers.

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=383023

--- Comment #9 from tempel.jul...@gmail.com ---
Ok, there is still a very minor stuttering left when scrolling with the
mousewheel (not autoscrolling).
Compton for life...

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[pavel kropitz]

https://bugs.kde.org/show_bug.cgi?id=383023

pavel kropitz  changed:

   What|Removed |Added

 CC||univ...@fu-solution.com

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=383023

--- Comment #8 from tempel.jul...@gmail.com ---
Someone found out that setting KWIN_TRIPLE_BUFFER=0 solves the issue on both
Intel and Radeon (Mesa):
https://forum.kde.org/viewtopic.php?f=111=138262=379117#p379117
I got a Radeon RX 560 now and I can confirm that it indeed does the trick.

It also solves the problem of stuttery compositing for the first few seconds
after compositing gets enabled (is this some kind of TB probing?).

So, it seems to me that TB=0 should be the default for Mesa drivers so that the
user wouldn't have to investigate regarding this problem with an environment
variable tweak.

PS: OGL 3.1 and Re-use screen content setting work without issues with TB=0.

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=383023

--- Comment #7 from tempel.jul...@gmail.com ---
Happens with automatic too. I can boot a Kubuntu 17.04 live disc and experience
the issue ootb.

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=383023

--- Comment #6 from Martin Flöser  ---
Please change the settings in Tearing prevention. You are using Re-use screen
content which shows a warning that it causes performance issues with your
hardware. Best use automatic.

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

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https://bugs.kde.org/show_bug.cgi?id=383023

--- Comment #5 from tempel.jul...@gmail.com ---
I restarted the whole system after changing the refreshrates to be extra sure.
:)

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=383023

--- Comment #4 from Martin Flöser  ---
Given the output it could be that the refresh rate for repainting does not get
recalculated when screen refresh rate changes.

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=383023

--- Comment #3 from tempel.jul...@gmail.com ---
Created attachment 107043
  --> https://bugs.kde.org/attachment.cgi?id=107043=edit
qdbus org.kde.KWin /KWin supportInformation for 75Hz resolution

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

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https://bugs.kde.org/show_bug.cgi?id=383023

--- Comment #2 from tempel.jul...@gmail.com ---
Created attachment 107042
  --> https://bugs.kde.org/attachment.cgi?id=107042=edit
qdbus org.kde.KWin /KWin supportInformation for 60Hz resolution

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[kwin] [Bug 383023] Firefox and mpv stutter with 75Hz on Intel Skylake IGP

[Martin Flöser]

https://bugs.kde.org/show_bug.cgi?id=383023

--- Comment #1 from Martin Flöser  ---
Please provide the output of
qdbus org.kde.KWin /KWin supportInformation
for both refresh rates.

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