Bug#623186: [xserver-xorg-video-nouveau] Hangs/slows down every few seconds

[Sven Joachim <svenjoac@gmx.de>]

Am 18.04.2011 um 09:39 schrieb Carsten Pfeiffer:

> I've just switched from the proprietary driver to nouveau and everything 
> looked great at first (perfect resolution, desktop performance was good, etc.). 
>
> However I soon noticed that the XServer repeatedly starts to hang or slow down 
> for a second or so even when the system is otherwise idle. E.g. I just move 
> the mouse in a circle and every 7-8s the cursor starts to stutter for a 
> second. When this happens I see the X process writing something (monitored 
> with iotop). Checking with strace, I notice that it appends this:
>
> [   673.108] (II) NOUVEAU(0): EDID vendor "LEN", prod id 16562
> [   673.108] (II) NOUVEAU(0): Printing DDC gathered Modelines:
> [   673.108] (II) NOUVEAU(0): Modeline "1920x1080"x0.0  139.00  1920 1980 2028 
> 2050  1080 1090 1100 1130 -hsync -vsync (67.8 kHz)
> [   673.108] (II) NOUVEAU(0): Modeline "1920x1080"x0.0  115.83  1920 1980 2028 
> 2050  1080 1090 1100 1130 -hsync -vsync (56.5 kHz)
>
> every 7-8 seconds to /var/log/Xorg.0.log

Does it help if you boot with the drm_kms_helper.poll=0 kernel parameter?

Regards,
        Sven