Comment 7 for bug 1852016

Two other apps that show the problem: pavucontrol and cheese.
I'm using the openbox window manager. I assume the apps are looking for some sort of reply that a gnome desktop would give them.

In strace, it's waiting on:

poll([{fd=15, events=POLLIN}], 1, 25000)
(the fd 15 for cheese, 11 for pavucontrol).

If I run journalctl -b 0 while pavucontrol is waiting to start, I get the attached log: I've edited it to show the end of one run of pavucontrol and then a second run up to the point where it hangs (with comments interspersed by me). At the end of the previous run, after I hit ^C, it prints

Failed to create file chooser proxy: Error calling StartServiceByName for org.freedesktop.impl.portal.desktop.gtk: Timeout was reached

A web search for that message gives a gazillion hits -- lots of people are seeing this -- but so far I haven't found a solution/workaround.