Ubuntu 17.10 Gnome/Xorg Lenovo 4th gen X1 20FBxxx Skylake i7 Intel built-in
video
Kernel 4.13.0-32-generic #35-Ubuntu SMP
When connecting Thinkpad Dock with 2 Dell monitors, screen locks up
(mouse is moving though) and is not responding. Monitors are not
recognized. Unlocks 20 sec after disconnect. Happens every time after
first connection following a reboot (first connection after reboot is
OK)
dmesg shows a lot of:
drm:intel_wait_ddi_buf_idle [i915_bpo]] *ERROR* ...
Workaround:
sudo vi /usr/share/X11/xorg.conf.d/20-intel.conf
paste:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "DRI" "3"
EndSection
reboot
The issue does not return, unless the above file it removed.
Hat tip to
https://wiki.archlinux.org/index.php/intel_graphics#Skylake_support
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https://bugs.launchpad.net/bugs/1552040
Title:
Laptop sometimes doesn't detect external monitor
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