Date: Tue, 15 Jan 2019 22:29:52 +0100 From: Jan Beich <jbeich@FreeBSD.org> To: Johannes Lundberg <johalun0@gmail.com> Cc: Greg V <greg@unrelenting.technology>, freebsd-x11@freebsd.org, Christian Weisgerber <naddy@mips.inka.de> Subject: Re: Intel modesetting and tearing Message-ID: <ef9d-vcbz-wny@FreeBSD.org> In-Reply-To: <CAECmPws7LMUZDHGP6VJJhm-XNXSE8hqbdyYDB4frVd_98rS2Nw@mail.gmail.com> (Johannes Lundberg's message of "Thu, 10 Jan 2019 18:40:31 %2B0000") 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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Johannes Lundberg <johalun0@gmail.com> writes: > On Thu, Jan 10, 2019 at 18:35 Greg V <greg@unrelenting.technology> wrote: > >> >> >> On Thu, Jan 10, 2019 at 9:22 PM, Johannes Lundberg <johalun0@gmail.com> >> wrote: >> > On Thu, Jan 10, 2019 at 16:03 Christian Weisgerber >> > <naddy@mips.inka.de <mailto:naddy@mips.inka.de>> >> > 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=E2=80=99s less noticeable on smaller screens but on 4= K@60Hz > it=E2=80=99s quite severe and no Compton settings help. I tried them all.= Or maybe > you mean Compton in combination GL in Firefox? Tearing probably depends on hardware. On my 4K@60Hz display (LG 27MU67-B connected to mainboard over DisplayPort 1.2) it isn't as severe, so I'm using compton *without* --vsync[1]. However, before drm-v4.9 at some point I had unfixable tearing due to what appeared broken VSync. -- [1] My config https://github.com/FreeBSDDesktop/kms-drm/issues/32
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