Public bug reported:
ed@userver:~$ lsb_release -rd
Description: Ubuntu Focal Fossa (development branch)
Release: 20.04
ed@userver:~$ apt-cache policy pkgname lightdm-gtk-greeter
lightdm-gtk-greeter:
Installed: 2.0.6-0ubuntu1
Candidate: 2.0.6-0ubuntu1
Version table:
*** 2.0.6-0ubuntu1 500
500 http://us.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
100 /var/lib/dpkg/status
N: Unable to locate package pkgname
I'm not sure if the issue is in the LightDM greeter, but it only happens
after I use the greeter.
I expect my desktop to get displayed soon after I click "Unlock" on the
greeter.
What happens is that there is a delay with black screen of at least 2
seconds (often 10 minutes).
Details:
When I "Switch User" and then click unlock button, I get a black screen
with no mouse cursor for 2 seconds, and then black screen with mouse
cursor for approx 0.65 seconds for every minute my PC was in DPMS (after
495 minutes in DPMS the black screen is up for a very long 321 seconds).
If I'm on greeter screen and keep moving mouse to avoid DPMS, then I
only have the 2 second delay.
This only happens with NVidia drivers (nouveau drivers don't have any
delay at all). I tested on fresh installs of both Ubuntu 19.10 with
default gdm and UbuntuStudio 19.10 with LightDM and now UbuntuStudio
20.04 nightly build. If I prevent DPMS by moving my mouse every few
minutes, then I only have the 2 second delay. I am not able to reproduce
this issue on UbuntuStudio 18.04.
Methods that cause delay:
- Click "Switch User" on the Whisker menu.
- Click "Switch User" on the "Action Buttons" on panel 0.
- dm-tool switch-to-greeter (displays greeter)
- dm-tool lock (starts DPMS, then greeter)
Methods that DO NOT cause delay:
- Click "Lock" on the Whisker menu.
- Click "Lock" on the "Action Buttons" on panel 0.
- xdotool key Ctrl+alt+l (runs screensaver, only delay if click "Switch
User")
- xflock4 (runs screensaver, only delay if click "Switch
User")
- xset dpms force off (runs screensaver, only delay if click "Switch
User")
Another interesting symptom is that the first 2 second black screen does
have the mouse pointer in 19.10, but not in 20.04. Also, If I Lock
instead of Switch User, then my desktop comes up immediately.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: lightdm-gtk-greeter 2.0.6-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-14.17-lowlatency 5.4.18
Uname: Linux 5.4.0-14-lowlatency x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu18
Architecture: amd64
Date: Sun Mar 1 00:56:12 2020
InstallationDate: Installed on 2020-02-29 (0 days ago)
InstallationMedia: Ubuntu-Studio 20.04 LTS "Focal Fossa" - Alpha amd64
(20200227)
ProcEnviron:
LANGUAGE=en_US
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: lightdm-gtk-greeter
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: lightdm-gtk-greeter (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1865323
Title:
Switch User+DPMS then click Unlock causes a delay with black screen
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