Bug#846278: light-locker is counterproductive
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On Tue, 2019-01-29 at 09:30 +0100, Tomas Pospisek wrote:
> * I had very spurious problems with the lock screen (say once in three
> months) under Debian stretch
> * however under 'buster' the problem is 100% repeatable
> * I have tried with both light-locker 1.8.0-3 and 1.8.0-2
That's very likely a bad interaction with the intel/modesetting driver
actually. It looks like there was regressions in vt-switch handling between
Stretch and Buster, which is why you see the black screen.
>
> * after uninstalling light-locker, everything "just works" that is,
> after resume I am presented the lightdm login screen
It works but that means your desktop actually not locked at all.
Light-locker is only a locker: when it's activated, it'll lock the desktop (on
vt 7) with the “redirect” message. Then it'll enable lightdm on vt 8, waiting
for the proper user to log in. When that's done, it'll switch back to vt 7.
>
> Some findings:
>
> * so, for some reason, the lock screen seems to be appearing on F7 and
> the desktop on F8. Once I am logged in, the desktop seems to be
> magically switching over to F7.
The lock screen is on vt7 (on top of your desktop, now locked). The login
screen is on vt8.
The situation is far from ideal, indeed, especially with the Intel driver
which doesn't handle vt switches properly. The manual vt-switch (Ctrl-Alt-
F1/Ctrl-Alt-F8) danse usually workaround the issue though.
Regards,
- --
Yves-Alexis
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