https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198936
Bug ID: 198936
Summary: Xorg consume 100% with XFCE after latest DRM2 changes
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 154848
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=154848&action=edit
Patch suggestion
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 can test patches if you have other suggestions.
--HPS
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