Description of problem:

I come back to my desktop and the lockscreen is up (monitors not asleep) but frozen and unresponsive. No mouse pointer, no response to keyboard <enter>, <ctrl-alt-F3>, etc. Machine is accessible over ssh and otherwise fine.

Version-Release number of selected component (if applicable):

Up-to-date Fedora Workstation 25 (beta) on Lenovo P710 with Radeon RX480, three displays.

How reproducible:

Happened twice today. I don't know how to trigger it.

Steps to Reproduce:
1. boot system
2. log in
3. wait? :/

Actual results:

Lock screen unresponsive.

Expected results:

Screens stay asleep until input is detected, then lockscreen transitions to login prompt.

Additional info:

journalctl says from the time of the freeze:

Nov 03 10:03:24 nanger kernel: [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* displayport link status failed
Nov 03 10:03:24 nanger kernel: [drm:amdgpu_atombios_dp_link_train [amdgpu]] *ERROR* clock recovery failed
Nov 03 10:03:24 nanger kernel: [drm:amdgpu_crtc_page_flip [amdgpu]] *ERROR* failed to get vblank before flip