kernel-3.17.0-0.rc3.git1.1.fc22.x86_64 very sluggish

[Kevin Fenzi]

Just booted: kernel-3.17.0-0.rc3.git1.1.fc22.x86_64 and video
performance is very slow. 

I do see: 

Sep 03 15:57:41 voldemort.scrye.com rtkit-daemon[756]: The canary thread is apparently
starving. Taking action.
Sep 03 15:57:41 voldemort.scrye.com rtkit-daemon[756]: Demoting known real-time threads.
Sep 03 15:57:41 voldemort.scrye.com rtkit-daemon[756]: Demoted 0 threads.
Sep 03 15:58:34 voldemort.scrye.com kernel: [drm:__gen7_gt_force_wake_mt_get] *ERROR*
Timed out waiting for forc
ewake to ack request.

Booting 3.17.0-0.rc3.git0.1.fc22.x86_64 all is back to normal. 

kevin