Date: Thu, 10 Jan 2019 23:17:22 +0300 From: Greg V <greg@unrelenting.technology> To: Johannes Lundberg <johalun0@gmail.com> Cc: Christian Weisgerber <naddy@mips.inka.de>, freebsd-x11@freebsd.org Subject: Re: Intel modesetting and tearing Message-ID: <1547151442.4829.1@smtp.migadu.com> In-Reply-To: <CAECmPws7LMUZDHGP6VJJhm-XNXSE8hqbdyYDB4frVd_98rS2Nw@mail.gmail.com> References: <slrnq3eqtu.m3o.naddy@lorvorc.mips.inka.de> <CAECmPwvmTzaYO=9_mokOc6nebD1z-VEsyUHpsJE1dwkB%2BsM6aA@mail.gmail.com> <1547145358.4829.0@smtp.migadu.com> <CAECmPws7LMUZDHGP6VJJhm-XNXSE8hqbdyYDB4frVd_98rS2Nw@mail.gmail.com>
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On Thu, Jan 10, 2019 at 9:40 PM, Johannes Lundberg <johalun0@gmail.com>=20 wrote: >=20 >=20 > On Thu, Jan 10, 2019 at 18:35 Greg V <greg@unrelenting.technology>=20 > wrote: >>=20 >>=20 >> On Thu, Jan 10, 2019 at 9:22 PM, Johannes Lundberg=20 >> <johalun0@gmail.com <mailto:johalun0@gmail.com>> >> wrote: >> > On Thu, Jan 10, 2019 at 16:03 Christian Weisgerber >> > <naddy@mips.inka.de <mailto:naddy@mips.inka.de>=20 >> <mailto:naddy@mips.inka.de <mailto:naddy@mips.inka.de>>> >> > wrote: >> > >> >> I recently switched from an obsolescent Radeon card to the=20 >> built-in >> >> Intel HD Graphics P4600 with i915kms.ko and the modesetting=20 >> driver. >> >> That works fine, but there is very noticeable tearing whenever >> >> something moves on-screen. If you google for it, you'll find=20 >> plenty >> >> of complaints on Linux, so this is not a FreeBSD issue. >> >> >> >> For MPlayer, replacing the default Xvideo with GL video output=20 >> (-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. >>=20 >> When I still used X on my Intel laptop (of course with the=20 >> modesetting >> DDX), I don't think GL acceleration of Firefox helped with tearing.=20 >> (I >> always used GL accelerated Firefox anyway.) >>=20 >> The solution was fiddling with compton flags, IIRC '--backend glx >> --vsync opengl-swc' was enough for the Intel GPU >=20 > What resolution? It=FFs less noticeable on smaller screens but on=20 > 4K@60Hz it=FFs quite severe and no Compton settings help. I tried=20 > them all. Or maybe you mean Compton in combination GL in Firefox? Yeah, I *always* used GL in Firefox. =
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