From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-15?Q?Nicolas_G=F6ddel?= Subject: Artifacts on external monitor with Optimus and GK107 on Thinkpad W530 Date: Tue, 29 Apr 2014 16:45:17 +0200 Message-ID: <535FBAFD.2010300@freakscorner.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: nouveau-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Sender: "Nouveau" To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org List-Id: nouveau.vger.kernel.org Hi there, last week I installed Ubuntu Gnome 14.04 on my Thinkpad W530. It has the following specifications: Intel Core i7-3820QM Intel HD 4000 and nVidia Quadro K2000M 15,6" FHD RGB 1920x1080 With "Optimus" enabled in the BIOS, I am able to use the external monitor via VGA-1-2. But there are refresh problems only on the external monitor: Mouse traces, parts of a window remain on the screen after closing the window, etc. My idea was to enable VSync for the external monitor but I don't know how to enable this. If you say enabling VSync will not help, maybe you have an other idea to avoid these refresh problems? This is what 'glxgears' outputs (First 8 lines the glxgears window was on the external screen, last 3 lines the window was on the internal screen): nicolas@tp-w530:~$ glxgears Running synchronized to the vertical refresh. The framerate should be approximately the same as the monitor refresh rate. 14814 frames in 5.0 seconds = 2962.673 FPS 16443 frames in 5.0 seconds = 3288.454 FPS 15912 frames in 5.0 seconds = 3182.394 FPS 14498 frames in 5.0 seconds = 2898.920 FPS 13834 frames in 5.0 seconds = 2766.738 FPS 14584 frames in 5.0 seconds = 2916.712 FPS 14802 frames in 5.0 seconds = 2960.245 FPS 11026 frames in 5.0 seconds = 2205.070 FPS 299 frames in 5.0 seconds = 59.675 FPS 299 frames in 5.0 seconds = 59.680 FPS 299 frames in 5.0 seconds = 59.676 FPS This is how I tested VSync. Best Regards, Nicolas