I booted to 4.8 again and saw the dmesg.
This is the error: [ 3.375735] ... [ 12.768084] [drm:drm_atomic_helper_commit_cleanup_done [drm_kms_helper]] *ERROR* [CRTC:26:pipe A] flip_done timed out
Apparently it is a known problem https://bbs.archlinux.org/viewtopic.php?id=218581 related to the Intel video driver in 4.8.
I booted to 4.8 again and saw the dmesg.
This is the error: atomic_ helper_ commit_ cleanup_ done [drm_kms_helper]] *ERROR* [CRTC:26:pipe A] flip_done timed out
[ 3.375735] ...
[ 12.768084] [drm:drm_
Apparently it is a known problem https:/ /bbs.archlinux. org/viewtopic. php?id= 218581 related to the Intel video driver in 4.8.