[kwin] [Bug 372739] Vsync disabled: slowmotion effects or wrong fps?

[Antonio Orefice]

https://bugs.kde.org/show_bug.cgi?id=372739

--- Comment #8 from Antonio Orefice  ---
and it picks: 
Refresh Rate: 75.0247 for both monitors with and without tearing prevention
enabled, which should be fine...

What puzzles me is why window movements are:
*jerky:
  with vsync disabled and screen at 75hz
*smooth:
  with vsync enabled at any refresh rate
  with vsync disabled and screen at 60hz
  with vsync disabled and screen at 75hz but MaxFPS=75 specified in kwinrc

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[kwin] [Bug 372739] Vsync disabled: slowmotion effects or wrong fps?

[Antonio Orefice]

https://bugs.kde.org/show_bug.cgi?id=372739

--- Comment #7 from Antonio Orefice  ---
Created attachment 102386
  --> https://bugs.kde.org/attachment.cgi?id=102386=edit
supportinformation from kwin when running without vsync enabled

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[kwin] [Bug 372739] Vsync disabled: slowmotion effects or wrong fps?

[Martin Gräßlin]

https://bugs.kde.org/show_bug.cgi?id=372739

--- Comment #6 from Martin Gräßlin  ---
> I gather this information:
> 1- From the kwin's "Show FPS" effect:
> it shows 60..62 fps

The effect clearly states that it's not a benchmark. The number doesn't say 
anything.

The way to check what kwin picks is in the supportInformation.

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[kwin] [Bug 372739] Vsync disabled: slowmotion effects or wrong fps?

[Antonio Orefice]

https://bugs.kde.org/show_bug.cgi?id=372739

--- Comment #5 from Antonio Orefice  ---
Hi again,
maybe there is a misunderstanding here, sorry.
The problem i have with limited framerate does not depend on the driver
settings,

I'm able to reproduce it even without nvidia's ForceFullCompositionPipeline=On

What happens, is that if i remove MaxFPS= line from kwinrc and disable any
"tearing prevention" in the compositor settings, kwin seems to render things at
60..62fps.

I gather this information:
1- From the kwin's "Show FPS" effect:
it shows 60..62 fps

2- by observing the windows edges while i drag it:
If kwin's render rate were close to the display refresh, i'd expect to see
smooth window dragging with a single "tearing" line, and this is indeed what
happens if i specify MaxFPS=75 OR if i switch to a 60hz mode.
But what happens is that the movement is jerky and there are several tearing
lines/artifacts.

As soon as i enable kwin's Tearing prevention ON (the method doesn't matter),
the fps effect jumps to 75, i repeat, this happens with AND without any special
driver configuration.

Thanks for your attention.

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[kwin] [Bug 372739] Vsync disabled: slowmotion effects or wrong fps?

[Martin Gräßlin]

https://bugs.kde.org/show_bug.cgi?id=372739

--- Comment #4 from Martin Gräßlin  ---
KWin is able to detect the refresh rate. If you configure your driver in a way
that it breaks KWin that is hardly a problem we care about. Just don't do it
then.

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[kwin] [Bug 372739] Vsync disabled: slowmotion effects or wrong fps?

[Antonio Orefice]

https://bugs.kde.org/show_bug.cgi?id=372739

--- Comment #3 from Antonio Orefice  ---
Hi Martin, thanks for answering.
The real issue here, is that kwin is unable to detect the right refresh rate
when vsync is disabled.
Can we continue here or should i open another bug report about that?
Or maybe even that would be marked as invalid?

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[kwin] [Bug 372739] Vsync disabled: slowmotion effects or wrong fps?

[Martin Gräßlin]

https://bugs.kde.org/show_bug.cgi?id=372739

Martin Gräßlin  changed:

   What|Removed |Added

 Resolution|--- |INVALID
 Status|UNCONFIRMED |RESOLVED

--- Comment #2 from Martin Gräßlin  ---
Custom misconfiguration too high max frame per second. If you need support
please use a support channel like forum.kde.org, but bugs.kde.org is not a
support forum.

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[kwin] [Bug 372739] Vsync disabled: slowmotion effects or wrong fps?

[Antonio Orefice]

https://bugs.kde.org/show_bug.cgi?id=372739

Antonio Orefice  changed:

   What|Removed |Added

Summary|Some effects goes   |Vsync disabled: slowmotion
   |slowmotion when vsync is|effects or wrong fps?
   |disabled|

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