Comment 28 for bug 1800196

Hi all,
We have found a workaround, for the display not usable.
I give it here for people like me who were stuck... with dell.

Since I cannot comment my post #24, here a summary:
Step to reproduce:
Plug HDMI cable 4k ready, of course connected to 4k screen.

Actual result:
Purpul screen (default color of my background) on both screen...
To have any things displayed I need to use CTRL + ALT + F1.

Using "Screen Mode" key (i.e. F8) we were able to have display properly set.
Hope this helps...
BR
Eric.