Thanks for the bug report. A couple of questions:
1. Xrandr.txt says nothing is connected to HDMI, but a monitor is
connected to DisplayPort. Are you using an adapter?
2. Does the same bug occur is you choose 'Ubuntu on Wayland' from the
login screen?
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1915382
Title:
external Monitor shows »No Signal« after dpms sleep
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