After wake up from suspend or hibernate i can see the desktop from before

[GiH]

Hi,
some annoying security problem here: After wake up from suspend or hibernate i can see the desktop from before for ca. 1 sec. Then comes the fadeout-effect and then lock screen. I assume the fadeout-effect must be before suspend/hibernate and not after resume.
This is not just nasty but a real security issue. How can i get a rid of it?

My config files:

/etc/systemd/logind.conf

[Login]
#NAutoVTs=6
#ReserveVT=6
#KillUserProcesses=no
#KillOnlyUsers=
#KillExcludeUsers=root
#InhibitDelayMaxSec=5
#UserStopDelaySec=10
#HandlePowerKey=poweroff
#HandleSuspendKey=suspend
#HandleHibernateKey=hibernate
HandleLidSwitch=hibernate
HandleLidSwitchExternalPower=suspend-then-hibernate
#HandleLidSwitchDocked=ignore
#HandleRebootKey=reboot
#PowerKeyIgnoreInhibited=no
#SuspendKeyIgnoreInhibited=no
#HibernateKeyIgnoreInhibited=no
#LidSwitchIgnoreInhibited=yes
#RebootKeyIgnoreInhibited=no
#HoldoffTimeoutSec=30s
#IdleAction=ignore
#IdleActionSec=30min
#RuntimeDirectorySize=10%
#RuntimeDirectoryInodes=400k
#RemoveIPC=yes
#InhibitorsMax=8192
#SessionsMax=8192

/etc/systemd/sleep.conf

[Sleep]
AllowSuspend=yes
AllowHibernation=yes
AllowSuspendThenHibernate=yes
#AllowHybridSleep=yes
SuspendMode=suspend
SuspendState=mem standby freeze
HibernateMode=platform shutdown
HibernateState=disk
HybridSleepMode=suspend platform shutdown
HybridSleepState=disk
HibernateDelaySec=30min

dconf

org.gnome.settings-daemon.plugins.power sleep-inactive-battery-type: ‘hibernate’
org.gnome.settings-daemon.plugins.power sleep-inactive-ac-type: ‘suspend’
org.gnome.settings-daemon.plugins.power power-button-action: ‘interactive’
org.gnome.desktop.lockdown disable-lock-screen: false

my system:

OS: Manjaro 21.1.0 Pahvo
Kernel: x86_64 Linux 5.10.56-1-MANJARO
DE: GNOME 40.0
WM: Mutter
CPU: Intel Core i5-8265U
GPU: UHD Graphics 620 + NVIDIA GeForce MX230
GPU-Driver: video-hybrid-intel-nvidia-driver

nvidia packages:

lib32-libvdpau 1.4-1
lib32-nvidia-utils 470.57.02-1
libvdpau 1.4-1
linux510-nvidia 470.57.02-5 (linux510-extramodules)
mhwd-nvidia 470.57.02-1
mhwd-nvidia-390xx 390.144-1
nvidia-dkms 470.57.02-1
nvidia-prime 1.0-4
nvidia-utils 470.57.02-1

[freggel.doe]

When resuming from suspension, Gnome shows the desktop before prompting user password

With the disclaimer that I’m not a GNOME user and that I also never suspend or hibernate my system ─ this is a desktop, not a laptop ─ the issue you are reporting has been reported here before, and I’m afraid it’s an upstream bug in GNOME. It was already around in GNOME 3.38 and it has apparently managed to sneak into the GNOME 4.0 code as well.

[linub]

i have the same thing on KDE when waking from sleep.

[GiH]

Can not confirm. I had old installation from last year steady updated to last month (to GNOME 40.0, trough GNOME 3.38). I didn’t had this effect.

Now i have a fresh installation and have this.

Probably some settings from past was taken through update routines and “saved” the right behavior of this transition effect?

[GiH]

I have investigated a little…
Now i believe the problem is not in GNOME or KDE but in systemd loginctl module.
If i start from the terminal the command:

$ loginctl lock-session

so i can see the same behavior:

1. The screen gets dark
   1.1. (at this point the system goes to suspend/hibernate mode, i guess)
2. The screen shows the last desktop for ca. 1 sec
3. The lock screen is appears

The hotkey Super+L doesn’t show this behavior.

It is possible to add a hook to the sleep routines of systemd (see /usr/lib/systemd/sleep) but which command is fired on Super+L hotkey?

[GiH]

Repaired from alone after some updates. I have just noticed the right behavior now. But i have no explanation.

[ApoorvPotnis]

Don’t know regarding GNOME, but this is a long-standing bug on KDE. 316734 – The desktop gets displayed for couple seconds after waking the system.