connecting interfaces with a udev rule triggers return to gdm login screen

[Michael Vogt]

As part of our udev backend we do something like:
$ sudo udevadm control --reload-rules ; sudo udevadm trigger --subsystem-nomatch=input

On 22.04 after boot this will trigger the gdm screen to reappear. It looks almost like the user is logged out except that the session is still running but the user is put on the VT of gdm.

This was also observed on arch.

[Michael Vogt (mvo)]

On the first run after a reboot I see the following with "sudo udevadm trigger --subsystem-nomatch=input -v". Interestingly doing it again causes the same list to be printed but it does not trigger the return to the gdm screen.

[Michael Vogt (mvo)]

This could be the solution https://gitlab.gnome.org/GNOME/gdm/-/commit/307c683f00e1711973139837992ca0f6f55314a5

[Michael Vogt (mvo)]

I just tested it and and with the attached debdiff I can no longer reproduce the problem.

[Jeremy Bícha (jbicha)]

This was cherry-picked as part of https://launchpad.net/ubuntu/+source/gdm3/42.0-1ubuntu3

I will be doing another gdm3 upload today to unblock gdm3 from jammy-proposed.

[Daniel van Vugt (vanvugt)]

The upstream fix was https://gitlab.gnome.org/GNOME/gdm/-/merge_requests/175

Although Jeremy put the fix in gdm3 version 42.0-1ubuntu3, most people would not have got it till 42.0-1ubuntu6.