Respond to SecureAttentionKey events from logind (once the MR for logind is merged #1922
Conversation
Why does it hang? Technically it should work to have multiple greeters on the same seat simultaneously, even though it does not make sense. |
If it helps, it's when I am using xorg-user as the greeter. I have not tested on my multiseat vm yet so it's only seat0 that I saw this I am not sure why it hangs, it only hangs if you try to activate the greeter again when the greeter is active. It seems to be something to do with the xserver itself or something? Because it's seems to be the display server that acts up, it doesn't respond to Ctrl+Alt+Fx either... |
…is sent to a seat when the greeter is already active
n3rdopolis
force-pushed
the
systemdrequestgreeter
branch
from
4877f3d
to
01cabf9
Compare
Maybe a deadlock during VT switch? |
Could be, or it could be it trying to restart the greeter/server incompletely or something If I try to vt switch away from the greeter vt and back to it, it still seems to deadlock (This is with QEMU's virtual serial console that I am able to run the chvt commands) It could also be an older xserver.... or just this VM Are you able to replicate with x11-user and these sets of commands by chance? |
|
Testing on a clean Kubuntu 24.04 ISO, with that set of commands to double-fire SwitchToGreeter, and well it seems that instead of hanging, it is starting the greeter twice, first on tty1, then on tty3, It defaults to running Xorg as root, and not x11-user, it seems like that this is the issue, it is trying another instance, it just was starting multiple greeters before, and maybe x11-user is different, and is stepping on the first instance, maybe that explains the hang |
This depends on systemd/systemd#29542 not merged yet, subject to change
The first commit fixes an issue where the greeter hangs if SwitchToGreeter double fires.
Something that if the systemd MR is merged will be easier for users to accidentally trigger, at least with logind, as it is possible to hit Ctrl+Alt+Shift+Esc or whatever the final sequence is, when the greeter is active
dbus-send --system --type=method_call --print-reply --dest=org.freedesktop.DisplayManager $XDG_SEAT_PATH org.freedesktop.DisplayManager.Seat.SwitchToGreeter
sleep 5
dbus-send --system --type=method_call --print-reply --dest=org.freedesktop.DisplayManager $XDG_SEAT_PATH org.freedesktop.DisplayManager.Seat.SwitchToGreeter