Bug#1011523: systemd-logind: lightdm ignores keyboard input for the first 3 seconds

[Michael Biebl]

Control: reassign -1 lightdm

Am 24.05.22 um 14:40 schrieb Vincent Lefevre:
> Package: systemd
> Version: 251-2
> Severity: minor
> 
> I'm using the lightdm display manager with lightdm-gtk-greeter.
> After the systemd upgrade, for about the first 3 seconds after
> the login box appears, keyboard input is ignored. Downgrading
> systemd to 250.4-1 makes the problem disappear, and upgrading
> it again makes the problem reappear.
> 
> The journalctl logs for systemd-logind
> 
>    journalctl -u systemd-logind.service -b [-1]
> 
> shows a time difference between these two systemd versions:
> 
> With systemd 250.4-1:
> 
> May 24 14:12:23 cventin systemd[1]: Starting User Login Management...
> May 24 14:12:23 cventin systemd-logind[661]: New seat seat0.
> May 24 14:12:23 cventin systemd[1]: Started User Login Management.
> May 24 14:12:23 cventin systemd-logind[661]: Watching system buttons on /dev/input/event0 (Power Button)
> May 24 14:12:23 cventin systemd-logind[661]: Watching system buttons on /dev/input/event1 (Power Button)
> May 24 14:12:23 cventin systemd-logind[661]: Watching system buttons on /dev/input/event2 (DELL Dell USB Entry Keyboard)
> May 24 14:12:27 cventin systemd-logind[661]: New session c1 of user lightdm.
> 
> With systemd 251-2:
> 
> May 24 14:17:48 cventin systemd[1]: Starting User Login Management...
> May 24 14:17:48 cventin systemd-logind[603]: New seat seat0.
> May 24 14:17:48 cventin systemd[1]: Started User Login Management.
> May 24 14:17:52 cventin systemd-logind[603]: New session c1 of user lightdm.
> May 24 14:17:57 cventin systemd-logind[603]: Watching system buttons on /dev/input/event0 (Power Button)
> May 24 14:17:57 cventin systemd-logind[603]: Watching system buttons on /dev/input/event1 (Power Button)
> May 24 14:17:57 cventin systemd-logind[603]: Watching system buttons on /dev/input/event2 (DELL Dell USB Entry Keyboard)
> 
> With systemd 250.4-1, I get "New session c1 of user lightdm" after the
> "Watching system buttons on ..." messages, while with systemd 251-2,
> I get it 5 seconds before, which could be related to this keyboard issue.
> 
> Note: of course, my keyboard is the "Dell USB Entry Keyboard" in question.

I'm not really familiar with lightdm and I don't see any such issue with 
gdm3.
So I'm going to reassign this issue tentatively to lightdm, as its 
maintainer will probably be in a better positition to help you get 
proper debug logs from lightdm.


@lightdm maintainers: if you find that this is a genuine bug in systemd, 
please re-assign back.

Michael