Bug#1004060: systemd: breaks lightdm / lightdm-gtk-greeter
On 2022-01-24 18:52:28 +0100, Vincent Lefevre wrote:
> On 2022-01-24 18:32:43 +0100, Yves-Alexis Perez wrote:
> > out of curiosity, did you try to move the mouse (and bring it “back” to the
> > main screen) and see if the login dialog appears? My main setup also uses a
> > dual screen (docked laptop with an external screen), and I didn't (yet)
> > experienced the issue you describe, but both my screens have pretty similar
> > resolutions (laptop is 1920×1080, external screen is 1920×1200).
>
> I had tried to move the mouse, but this didn't have any effect. So
> this is rather different than bug 993752 (where moving the mouse
> switches the width of the screen) I had reported in September.
Note that the virtual screen is the 4K one, thus only a part of the
desktop is visible on the laptop screen (there is no scrolling). The
mouse pointer cannot go beyond of the 4 edges (and corners) of this
4K virtual screen.
> > Also are both screens on and visible?
In my latest test, I noticed the following: initially, only the laptop
screen was visible, and it had the login dialog, but a fraction of
second later, it became black also for a fraction of second, then the
screen appeared on both monitors (laptop + left 4K monitor), mirrored,
but without the login dialog and menu.
So I suspect that lightdm detected that a second monitor was connected
*after* the greeter appeared. It handled it, but the greeter was then
no longer visible.
Note also that if I type Alt-F4 to do a shutdown, a confirmation dialog
should appear, but it doesn't. I can still confirm by hitting Enter,
though.
--
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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