From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?utf-8?Q?Cl=C3=A9ment?= Lassieur Subject: Re: Xorg tearing fix on Intel HD Graphics 4000 Date: Mon, 07 Aug 2017 23:48:25 +0200 Message-ID: <87shh36od2.fsf@lassieur.org> References: <877f053hc7.fsf@gnu.org> <87k24539rz.fsf@elephly.net> <87d19xwjxe.fsf@gnu.org> <87h8z9jlvk.fsf@netris.org> <87vank7h4x.fsf@gmail.com> <87injkiatt.fsf@netris.org> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:52800) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dept5-0000FX-4M for guix-devel@gnu.org; Mon, 07 Aug 2017 17:48:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dept0-0002DS-0B for guix-devel@gnu.org; Mon, 07 Aug 2017 17:48:35 -0400 Received: from mail.lassieur.org ([83.152.10.219]:43658) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1depsz-0002C8-Nk for guix-devel@gnu.org; Mon, 07 Aug 2017 17:48:29 -0400 In-reply-to: <87injkiatt.fsf@netris.org> List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org Sender: "Guix-devel" To: Mark H Weaver Cc: guix-devel Mark H Weaver writes: > If we want to make UXA the default acceleration method for > xf86-video-intel, I've attached a patch that accomplishes this without > overriding auto-configuration. Given the severity of the problems on > the X200, I would be in favor of applying this patch to master. The > X200 is an important system for us because it is one of only two > RYF-certified laptops. On X200 this patch introduces the bug I described here: https://bugs.freedesktop.org/show_bug.cgi?id=101620#c4 > FWIW, I do not notice any visually apparent difference in performance > between UXA and SNA on the X200 for things like web browsing, watching > videos, and running gnome-shell. Nonetheless, I've seen reports that > SNA performs significantly better than UXA, at least on newer Intel > chips: > > http://cynic.cc/blog/posts/sna_acceleration_vs_uxa/ > https://ickle.wordpress.com/2013/10/02/and-over-in-the-red-corner/ > https://www.reddit.com/r/archlinux/comments/17sy9l/intel_graphics_uxa_vs_sna/ > > I would invite someone who cares about this to enhance > 'xorg-configuration-file' in (gnu services xorg) to allow users to > optionally specify which accel-method to use for each driver. That would be useful indeed, I will have a look at it.