From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Vetter Subject: Re: Tearing video on Sandy Bridge Date: Thu, 3 May 2012 20:43:01 +0200 Message-ID: <20120503184301.GL4983@phenom.ffwll.local> References: <20120503180909.GA12017@mac.home> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-we0-f177.google.com (mail-we0-f177.google.com [74.125.82.177]) by gabe.freedesktop.org (Postfix) with ESMTP id B02D89E710 for ; Thu, 3 May 2012 11:41:55 -0700 (PDT) Received: by werp11 with SMTP id p11so1590992wer.36 for ; Thu, 03 May 2012 11:41:55 -0700 (PDT) Content-Disposition: inline In-Reply-To: <20120503180909.GA12017@mac.home> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org Errors-To: intel-gfx-bounces+gcfxdi-intel-gfx=m.gmane.org@lists.freedesktop.org To: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org On Thu, May 03, 2012 at 08:09:09PM +0200, tino.keitel+xorg@tikei.de wrote: > Hi, > > the tearing video issue with XV output seemed to be fixed on my old > computer with i945 graphics at some point. Last year I upgraded to a > box with i5-2400, and got bitten again by tearing video. Currently I > use kernel 3.4-rc5, Xserver 1.12 and xorg-intel 2.18. I use gnome3 and > gnome-shell on my desktop, and tried several players (mplayer, vlc, > mythtv). > > Am I just doing something wrong, or is smooth video playback not the > scope of the Sandy Bridge development? We used scanline waits embedded in the gpu command stream to achieve tear-free video. On snb hw designers killed that feature :( The only way to get tear-free screen updates on snb is with pageflips, which requires a opengl compositor (and wayland if you have more than one screen). -Daniel -- Daniel Vetter Mail: daniel@ffwll.ch Mobile: +41 (0)79 365 57 48