** Description changed:
Login screen (gdm3) is purple blank after switching userA -> userB ->
userA again.
Sometimes need to switch 5 times.. but definitely after around 5 times
gdm3 breaks (it shows just a blank purple screen with the cursor).
## Workaround
Ctrl+Alt+F3 (or F4.. F5...) until I get to the user I need to (and unlock the
screensaver there).
OR: switch to the console and run "exec sudo systemctl restart gdm3". ("exec"
is not necessary but highly desirable from the security point of view, so there
won't be a logged in session).
+ ## Workaround 2
+
+ To not use gdm3. There are alternatives such as sddm or ligthdm:
+
+ sudo apt install sddm
+
+ OR
+
+ sudo apt install lightdm
+
+
+ Ctrl+Alt+F5 (drop to a console)
+ sudo systemctl stop gdm3
+ exec sudo systemctl start display-manager
+
+
+ ## Details
+
arno@z390-linux:~$ dpkg -l gdm3
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-=======================-============-=================================
ii gdm3 3.36.3-0ubuntu0.20.04.4 amd64 GNOME Display Manager
- arno@z390-linux:~$ cat /proc/cmdline
+ arno@z390-linux:~$ cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-5.11.0-25-generic
root=UUID=a39515ec-3bed-493b-8286-3904a4aac9de ro quiet splash vt.handoff=7
- arno@z390-linux:~$ nvidia-smi
- Wed Aug 11 16:42:07 2021
+ arno@z390-linux:~$ nvidia-smi
+ Wed Aug 11 16:42:07 2021
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 460.91.03 Driver Version: 460.91.03 CUDA Version: 11.2
|
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC
|
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M.
|
| | | MIG M.
|
|===============================+======================+======================|
| 0 GeForce RTX 207... Off | 00000000:01:00.0 On | N/A
|
| 0% 37C P8 17W / 215W | 473MiB / 7979MiB | 1% Default
|
| | | N/A
|
+-------------------------------+----------------------+----------------------+
-
+
+-----------------------------------------------------------------------------+
| Processes:
|
| GPU GI CI PID Type Process name GPU Memory
|
| ID ID Usage
|
|=============================================================================|
| 0 N/A N/A 2211 G /usr/lib/xorg/Xorg 35MiB
|
| 0 N/A N/A 10496 G /usr/lib/xorg/Xorg 106MiB
|
| 0 N/A N/A 10626 G /usr/bin/gnome-shell 157MiB
|
| 0 N/A N/A 16828 G /usr/lib/xorg/Xorg 35MiB
|
| 0 N/A N/A 38063 G ...AAAAAAAAA= --shared-files 80MiB
|
+-----------------------------------------------------------------------------+
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gdm3 3.36.3-0ubuntu0.20.04.4
ProcVersionSignature: Ubuntu 5.11.0-25.27~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-25-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset
nvidia
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Wed Aug 11 16:37:35 2021
InstallationDate: Installed on 2020-09-26 (318 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: gdm3
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/bugs/1939592
Title:
Login screen (gdm3) is purple blank after switching userA -> userB ->
userA again
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