Boot very slow because of drm_kms_helper errors
This is a bug. To avoid delay you can use workaround. From terminal run:
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"
sudo update-grubsudo reboot
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.
For screen-tearing correction, these ideas may also help (https://bbs.archlinux.org/viewtopic.php?id=233957):
Post by jaylittle - 2018-06-25 21:54:22 If you want to solve your screen tearing issue in Xfce without relying upon the broken intel xorg driver, just disable the built in Xfce compositor and run something like compton as part of your session startup. That should resolve your issue with screen tearing and allow you to use the more reputable kms driver.