Re: Intel modesetting and tearing

On Thu, Jan 10, 2019 at 18:35 Greg V <[email protected]> wrote:

>
>
> On Thu, Jan 10, 2019 at 9:22 PM, Johannes Lundberg <[email protected]>
> wrote:
> > On Thu, Jan 10, 2019 at 16:03 Christian Weisgerber
> > <[email protected] <mailto:[email protected]>>
> > wrote:
> >
> >>  I recently switched from an obsolescent Radeon card to the built-in
> >>  Intel HD Graphics P4600 with i915kms.ko and the modesetting driver.
> >>  That works fine, but there is very noticeable tearing whenever
> >>  something moves on-screen.  If you google for it, you'll find plenty
> >>  of complaints on Linux, so this is not a FreeBSD issue.
> >>
> >>  For MPlayer, replacing the default Xvideo with GL video output (-vo
> >> gl)
> >>  eliminates tearing.
> >>
> >>  And as I found out just today and quite by accident, in Firefox
> >>  toggling layers.acceleration.force-enabled to true will also
> >> eliminate
> >>  all tearing, whether from soft-scrolling or when playing YouTube
> >>  videos.  Hallelujah!
> >
> >
> > Woot?! You mean I can use modesetting AND have tearfree Firefox?
> > Thanks for
> > the tip!! I will use this until I switch i3 -> Sway.
>
> When I still used X on my Intel laptop (of course with the modesetting
> DDX), I don't think GL acceleration of Firefox helped with tearing. (I
> always used GL accelerated Firefox anyway.)
>
> The solution was fiddling with compton flags, IIRC '--backend glx
> --vsync opengl-swc' was enough for the Intel GPU


What resolution? It’s less noticeable on smaller screens but on 4K@60Hz
it’s quite severe and no Compton settings help. I tried them all. Or maybe
you mean Compton in combination GL in Firefox?



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