[Bug 107636] New: Intel NUC: no remote desktop possible in case no monitor attached

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107636

            Bug ID: 107636
           Summary: Intel NUC: no remote desktop possible in case no
                    monitor attached
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: nl_gaijin at yahoo.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hardware: Intel NUC6i3SYH, containing CPU i3-6100U with integrated graphics.
BIOS version 0068 (latest).

Previous OS: Ubuntu 16.04.5. Upgraded a few days ago to Ubuntu 18.04.1 LTS.
This machine is used as headless server on a local network. It is controlled
via another computer on the same network, using Remmina remote desktop client.

Issue: since the Ubuntu upgrade is it no longer possible to view the NUC
desktop remotely unless a display is physically connected to the NUC (either to
HDMI or mini DisplayPort). Only when a display is connected is it possible to
see the NUC's desktop on a remote computer using Remmina. Without it is only a
black screen visible in Remmina.
This issue was not present when using Ubuntu 16.04.1 ~ 16.04.5. Here it was not
necessary to physically connect a display to the NUC in order to get remote
desktop control.
In Ubuntu settings have I switched off screen lock and switched off all power
saving settings. This had no effect on this issue.

My guess (but I'm no expert) is that the graphics processor switches itself
off, or in a low-power mode, in case no display is detected. Which is nice for
a mobile device (e.g. laptop), but not relevant for a NUC which is permanently
powered.

Is this a bug? Or is there a setting somewhere in Ubuntu 18.04 that I can fix
this myself?

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