Lenovo Thinkpad R61
From Jay's Cafe' Wiki
drm_atomic_helper_wait_for_flip_done
drm_atomic_helper_wait_for_dependences
...try:
xed admin:///etc/default/grub
Modify the line there as:
GRUB_CMDLINE_LINUX_DEFAULT="video=SVIDEO-1:d quiet splash"
Save. Then sudo update-grub & reboot...
