Public bug reported:
Scenario:
- Install Xubuntu-22.04 without any modification.
- In the energy settings, select "standby" and "lock screen when..."
- Goto standby with button in the "Start" menu, or with "systemctl suspend"
- Resume, pushing the button at the docking station (Dell PR03X)
Black screen shown. Ctrl-Alt-F2 switches to the console; system is running
normal.
xfce4-screensaver-dialog is running - nothing good for.
Alt-ctrl-F2 + Alt-ctrl-F7 does not resolve the issue.
This worked fine on Xubuntu 20.04., presenting the password dialog for
unlock.
Without screen locking, resume also works fine on 22.04.
The use of xfce4-screensaver-dialog seems to provoke the issue.
> lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.1 LTS
Release: 22.04
Codename: jammy
> lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
This bug is a security vulnerability because screen locking cannot be
used in conjunction with suspend/resume.
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
** Information type changed from Private Security to Public
** Description changed:
Scenario:
- Install Xubuntu-22.04 without any modification.
- In the energy settings, select "standby" and "lock screen when..."
- - Goto standby in the "Start" menu, or with "systemctl suspend"
+ - Goto standby with button in the "Start" menu, or with "systemctl suspend"
- Resume, pushing the button at the docking station (Dell PR03X)
Black screen shown. Ctrl-Alt-F2 switches to the console; system is running
normal.
- xfce4-screensaver-dialog us running - nothing good for.
+ xfce4-screensaver-dialog is running - nothing good for.
Alt-ctrl-F2 + Alt-ctrl-F7 does not resolve the issue.
- This worked fine on Xubuntu 20.04.
+ This worked fine on Xubuntu 20.04., presenting the password dialog for
+ unlock.
Without screen locking, resume also works fine on 22.04.
The use of xfce4-screensaver-dialog seems to provoke the issue.
> lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.1 LTS
Release: 22.04
Codename: jammy
> lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
This bug is a security vulnerability because screen locking cannot be
used in conjunction with suspend/resume.
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You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gdm3 in Ubuntu.
https://bugs.launchpad.net/bugs/1992233
Title:
xfce4-screensaver / Black screen after resume with locked screen
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1992233/+subscriptions
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