Request for ca1dfdc9 to be backported to server-21.1-branch

Recently (like 2 months ago) I submitted 3 commits, 2 that seem to have gotten backported to server-21.1-branch b89fdd52 (xf86: Accept devices with the 'simpledrm' driver.) 0ed7b122 (xfree86: On Linux, while only seat0 can have TTYs, don't assmume all seat0s have TTYs)

and server-21.1-branch ca1dfdc9 (os: Try to discover the current seat with the XDG_SEAT var first) that did not get backported

IMHO ca1dfdc9 could be backported too?

Thanks

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