Bug#972417: xfce4-power-manager: System left idle => 'display power management' auto-locks session => no X session or lightdm greeter
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Hash: SHA256
control: forcemerge 870641 -1
On Sun, 2020-10-18 at 10:23 +0200, franck wrote:
> Package: xfce4-power-manager
> Version: 1.6.1-1
> Severity: grave
>
> Dear Maintainer,
>
> [ Bug description ]
> Bug happens when the screen auto-locks due to user inactivity. Then the
> screen switches off.
> To easily test that, set following to 1 min or so
> Xfce menu Applications -> Settings -> Power Manager -> Display -> 'Switch
> off after'
>
> After such auto-lock, it appears not possible to get back the X session
> anymore.
> Because
> - by moving mouse or typing on keyboard the screen does not wake up. It
> stays off, black.
> - with Ctrl+Alt-F7 one gets
> This session is locked
> You’ll be redirected to the unlock
> dialog automatically in a few seconds
> but after waiting a few seconds the screen switches off again.
> => no way to get to the lightdm greeter.
> In both cases: not possible to get back the running X session anymore.
The lightdm greeter is on tty8, so try with Ctrl-Alt-F8.
>
> => I filled this bug against xfce4-power-manager
> But I have no clue whether xfce4-power-manager
> - processes the locking completely by itself ?
> - just prepares locking, like deactivating keyboard/mouse? and then trigger
> like light-locker-command --lock...
> - only asks another package to do the full locking procedure.
>
>
>
> Bug occurred under (at least) both kernels:
> linux-image-4.19.0-11-amd64-unsigned 4.19.146-1
> linux-image-5.8.0-0.bpo.2-amd64 5.8.10-1~bpo10+1
>
>
>
> Also this bug gives a bad image to the user:
> - 'system crashed'
> - wondering what is the cause:
> - is my graphic card not properly waking up ?
> - or a bug in kernel ?
> - or Xorg ?
> - or light-locker ?
> ...
> Thus they are probably numerous of open bugs that could be closed by fixing
> this bug.
Actually it's (or should be) already fixed in stable.
>
>
> [ Bugs reported against other packages, & that seem linked to this bug ]
> Bugs in source package light-locker
> #906902 System left idle makes system freeze
> #870641 light-locker, lightdm: screen stays off after resume
> and all the merged one:
> 805711, 846278, 868087, 908329, 922095, 929461, 929834, 931555
> #835461 light-locker breaks suspend/resume with nvidia legacy 340 drivers
> Bugs in source package lightdm
> #867620 lightdm unlock screen randomly doesn't appear
With all those bugs already opened and the mess we're already in, why opening
*yet another one*? Honestly it adds more confusion than anything at that
point.
As indicated in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=870641#218
the bug *should* be fixed in 10.5 with kernel 4.19.0-10. You indicated that
you tested with linux-image-4.19.0-11-amd64-unsigned 4.19.146-1
Can you retry with that kernel and check you have the “atomic” message in the
kernel log:
broken atomic modeset userspace detected, disabling atomic
Regards,
- --
Yves-Alexis
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