Fix very long boot time after migrated to Debian Buster 64bit
The fix
After migrating from Emmabuntüs 32bit to Emmabuntüs 64bit, boot time was very long and the following messages were shown:
[drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] *ERROR* [CRTC:41:pipe B] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [PLANE:35:plane B] flip_done timed out
The problem can be fixed by modifying grub configuration. Open /etc/default/grub, then change the GRUB_CMDLINE_LINUX_DEFAULT line:
GRUB_CMDLINE_LINUX_DEFAULT="video=SVIDEO-1:d quiet splash"
Then run:
sudo update-grub
On next reboot, you should see the difference.