Re: [Call for testers] DRM device-independent code update to Linux 3.8 (take #2)

On Tue, March 24, 2015 00:29, Hans Petter Selasky wrote:
> Hi,
>
>
> Without the attached kernel patch(es), Xorg starts consuming alot of CPU
> and becomes very unresponsive and unusable.
>
> Using ktrace reveals that X-org is issuing DRM_IOCTL_MODE_GETCONNECTOR
> over and over again with no apparent reason. It doesn't happen when using a
> simple window manager like blackbox. I was not able to use XFCE4 (9-stable
> userland) with 11-current kernel at all, after the latest DRM2 kernel
> updates. It worked fine before the update.
>
> I'm not sure what is causing it. Going through the new DRM2 code
> revealed that a mode sorting function did not take all parameters like
> interlaced or not into account, causing the mode list to be reshuffelled
> every time a new mode scan was done. Not sure if Xorg cares about this
> though.

I got the same problem with XFCE4, Xorg at 100% CPU.

Applied the patch and it works again.

Jakob