Missing input devices when using LightDM

[schauveau]

I am using sway compiled from git master on Debian and I noticed that my Fn+Brightness keys were not reporting any events when Sway is started by LightDM (via a custom desktop file in /usr/share/wayland-sessions/ ). Everything works fine when Sway is manually started from a VT.

So I eventually figured out that Sway via LigthDM is missing 3 input devices including the one that reports brightness key events. However, those missing input devices exist and can be tested using evtest or libinput. I also noticed that the missing input devices (and the brightness key events) become visible after switching back and forth to another VT.

I suspect a race condition between LightDM and Sway (because of ibus?)

I am using a SSD so Sway starts quite fast. Adding a sleep 1 before sway appears to solve the problem for me.

System information:

• debian buster
• ligthdm 1.26.0-3
• sway version 1.0-rc1-145-g19df2e59 (Mar 6 2019, branch 'master')

[ddevault]

Report this bug with lightdm please.

[schauveau]

canonical/lightdm#63