Bug#1004060: systemd: breaks lightdm / lightdm-gtk-greeter
On 2022-01-20 13:59:21 +0100, Vincent Lefevre wrote:
> This issue is actually also now reproducible with systemd 250.2, but
> the systemd version seems to have an effect of the possible behaviors
> (A, B and C below):
>
> With systemd 250.2:
> A. 2 monitors detected, the greeter appears.
> B. 2 monitors detected, the greeter does not appear.
>
> With systemd 250.3:
> B. 2 monitors detected, the greeter does not appear.
> C. 1 monitor detected (the laptop screen), the greeter appears on
> this monitor.
>
> Case C is actually like a one-monitor setup (it could occur in the
> past, perhaps still currently with systemd 250.2, but I haven't
> done many tests with this version, mainly focusing on 250.3).
> Note that when 2 monitors are detected, they are always mirrored.
>
> Case B has never appeared before (I was always in case A or C),
> while my monitor setup hasn't changed. 2 things have changed on
> my laptop in the last few days:
>
> 1. Some packages have been upgraded, but lightdm-gtk-greeter is
> still from November 2020 (2.0.8-2). Concerning lightdm, this
> is lightdm 1.26.0-8 from 11 January 2022, but only with minor
> changes compared to lightdm 1.26.0-7 from Febrary 2020.
> I might check later.
I've tried with lightdm 1.26.0-7 (from Debian/stable) and no workaround
(i.e. no active-monitor=1 in lightdm-gtk-greeter.conf).
First reboot: case B, i.e. the bug also occurred.
Second reboot: case A (so that case can also occur with systemd 250.3).
I doubt that the systemd matters at all, possible except by slightly
changing the timing, which might make some case more/less likely than
before.
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
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