Re: Artifacts on external monitor with Optimus and GK107 on Thinkpad W530

["Nicolas Göddel" <mailinglists-WO/VGsxbqFypxiQzEpw4SQ@public.gmane.org>]

Hi,

as additional information here a youtube video showing the problem after closing
a vlc window:

https://www.youtube.com/watch?v=-GWaEo-pEGs

Am 29.04.2014 16:45, schrieb Nicolas Göddel:
> 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
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