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

[Michael Biebl]

Am 24.06.22 um 16:39 schrieb Vincent Lefevre:

On 2022-06-24 15:57:22 +0200, Vincent Lefevre wrote:

On 2022-05-25 20:43:50 +0200, Yves-Alexis Perez wrote:

I don't think there's really code in the display manager to specifically
handle keyboards, I'd assume it's in the X part, but I might be wrong.

The issue could also be in the X server, e.g. in case of a race condition
whose effects appeared after the upgrade to systemd 251-2.

Well, the X server is not the cause. As said in the Xorg logs:
The server relies on udev to provide the list of input devices.

And the logs show that before the upgrade to systemd 251, the delay
was less than 2 seconds, while after the upgrade to systemd 251,
the delay is now 4 - 7 seconds.

Before:

[    14.784]
X.Org X Server 1.21.1.3
[    16.597] (II) config/udev: Adding input device DELL Dell USB Entry Keyboard 
(/dev/input/event2)

[    15.005]
X.Org X Server 1.21.1.3
[    16.818] (II) config/udev: Adding input device DELL Dell USB Entry Keyboard 
(/dev/input/event2)

After:

[    11.999]
X.Org X Server 1.21.1.3
[    15.909] (II) config/udev: Adding input device DELL Dell USB Entry Keyboard 
(/dev/input/event2)

[     7.688]
X.Org X Server 1.21.1.3
[    14.644] (II) config/udev: Adding input device DELL Dell USB Entry Keyboard 
(/dev/input/event2)

Is the kernel stressed because systemd now starts too many services
in parallel?

So is this maybe just a perceived slowness?



Regards,
Michael

What I can see here is that "Before" the Xorg server was apparently ready after 16.597/16.818 and "After" it is after 15.909/14.644. So it is actually quicker? That said, as neither Yves-Alexis nor me is able to reproduce any issues here, your best bet, if you think this is related to systemd, is to run a git bisect to find the commit which changed the behaviour.

OpenPGP_signature
Description: OpenPGP digital signature