How do you start a display manager in a Xephyr window?

[elypter]

i ran

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sudo Xephyr :8 -screen 800x600

and in another window i ran

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dm-tool add-local-x-seat 8

I didnt get any error message but the Xephyr window stays black.

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dm-tool add-nested-seat 

also only opens an empty window.
running regular applications with

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DISPLAY=:8 appname

works

any idea whats wrong?

[Flemur]

any idea whats wrong?

No, but this might help:
https://wiki.archlinux.org/index.php/Xephyr

[elypter]

when running

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 startx -- /usr/bin/Xephyr :1

i get this error

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xinit: XFree86_VT property unexpectedly has 0 items instead of 1
xinit: connection to X server lost

waiting for X server to shut down