Bug#833182: drmSetMaster failed: Permission denied
Yesterday I noticed another issue and wondered if it might be related
to this one. Turns out: yes, it is.
The issue as I observed it was the complete lack of all XDG_* environment
variables when I logged in. Didn't matter whether it was console or ssh.
(There was also no /run/user/MYUID directory created for me.)
After some digging, I found that there is a known issue in recent
systemd: <https://github.com/systemd/systemd/issues/7074>
Long story short, any user defined by a network service like NIS will not
work in systemd because systemd-logind runs (by default config) in a
no-networking-allowed sandbox. And my user account is defined in NIS.
There are multiple possible workarounds. The one I tried first was
installing the nscd package. That didn't fix it immediately, but it
*did* fix it after rebooting. So, I never moved on to other potential
solutions such as defining a drop-in override for systemd-logind to turn
off the IPAddressDeny=any feature. That may be better or worse; I can't
say.
My problem may be different from others in this thread, despite the
same symptomatic error message in the X log. I'm going to open a
separate bug against the nis package just in case; if it turns out that
I'm wrong, then the bug can be marked as a duplicate.
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