I just installed 16.04 on my MacBook Air, and everything seems to work well, except booting the system. I've been going through the
dmesg-log and found out that
drm_kms_helper-errors occur repeatedly and takes a lot of time each. The excact error is like this:
[drm:drm_atomic_helper_commit_cleanup_done [drm_kms_helper]] *ERROR* [CRTC:26:pipe A] flip_done timed out
CRTC-value and the
pipe-value varies, but otherwise all the errors are identical.
What does this mean and how do I fix it? If it can't be fixed, how do I prevent it from using so much time when booting?