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?
> 

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?
So is this maybe just a perceived slowness?

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.

Regards,
Michael
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