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

The 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?

This is a bug. To avoid delay you can use workaround. From terminal run:

  1. sudo nano /etc/default/grub

Then add the kernel boot parameter: video=SVIDEO-1:d, so it will look like this: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=SVIDEO-1:d"

  1. sudo update-grub
  2. sudo reboot
  • didn't work for me :( – lucacerone Feb 5 at 8:25
  • Works very well on Macbook with ElementaryOS too :) – user17254 Feb 9 at 13:41
  • 2
    with this boot parameter the boot time improved from about 3 Minutes to 20 seconds (ubuntu 18.04) with a Intel GM965 graphic – sdu May 21 at 14:38
  • Fixed issue on Arch Linux on Lenovo ThinkPad R61i. – Erikas Jul 11 at 18:18
  • It work on my old Intel Pentium Dual-core 32bit, lubuntu 16 – LeCanardNoir Aug 21 at 18:51

I have still this problem after adding video=SVIDEO-1:d to grub like described above.

But I found this entry (https://bugs.archlinux.org/task/51703) with this comment:

Comment by Luis Bourgard (unnilquadium) - Friday, 26 January 2018, 19:08 GMT Still present in 4.14.14 It only happens with the xf86-video-intel package installed (running on a laptop with intel integrated graphics on an i5-2410m). Uninstalling that package fixes the issue, but it also introduces some screen tearing.

I removed the package with sudo apt-get remove xserver-xorg-video-intel. Maybe this works for us.

  • 2
    Exactly! Removing xf86-video-intel fixed the issue. This package is recommended to avoid everywhere! – Erikas Jul 11 at 17:56
  • Don't working on my old intel pentium dual-core 32bit with lubuntu 16 – LeCanardNoir Aug 21 at 15:12

protected by Community Jul 26 at 15:01

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