Comment 4 for bug 1813672

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Oleg Cherkasov (o1e9) wrote :

Some kind of similar issue on ThinkPad X250 20CM004EMN. Switching back to 4.15.0-43-generic solved the problem.

Booting with 4.15.0-44-generic on Ultra Dock station gives blank screen on login/display manager. Undocking does not solve the issue so only SysRq+REISUB or hard reboot help. X250 rejects to fall sleep on closed lid or Fn+4 combination. Tried on two different Ultra Dock stations with various monitors, the result is the same.

Booting with 4.15.0-44-generic undocked brings login/display manager as expected. It is possible to dock after that.