I have the almost same issue with my Dell latitude E5520 plugged into the dock
station WD15. This issue occurred after the latest linux kernel upgrade (to
4.15.044.46).
At startup all my screen are correctly initialized. But when my computer enter
in power-save mode (i.e screen become black after a while), my laptop is not
responding anymore. I need to restart it. Notice that the "magic keys" works :
the sequence alt+sys+[s,u,b] restart the computer.
** Changed in: linux (Ubuntu Bionic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1813663
Title:
External monitors does not work anymore 4.15.0-44
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