$ xfce4-display-profile-chooser.sh -s list -k
Select the profile you want to set:
0) Exit
1) id: 00e01c59a3e26956e8406566d446619db82d2c27, name: right¢er
2) id: 0b0761505df198cb6d85592748a1134abfe1b17a, name: right+center
3) id: 2d8f98d91c740983b8ad03f18d8b578d32d0a8ac, name: all 3, state: set; not active
4) id: 305047e96ec089021660ee5965f893ac80268731, name: center
5) id: 356a192b7913b04c54574d18c28d46e6395428ab, name: 1
6) id: 77de68daecd823babbb58edb1c8e14d7106e83bb, name: 3
7) id: 85c274929bc0e28eafd3734f2c25046c3b95b36b, name: middle
8) id: AutoEnableProfiles, name: true
9) id: Notify, name: true
10) id: Schemas, name: 2d8f98d91c740983b8ad03f18d8b578d32d0a8ac
11) id: ced82d6ccf96442f473200ee3a6c1465363bff88, name: center+right
12) id: d87c448044defb778f33158d8ccf94a20531d600, name: all
make your choice: 3
Display connected to DP-2 do not support this profile (3840x2160 59.996625Hz).
Display connected to DisplayPort-1-0 do not support this profile (3840x2160 30.000000Hz).
Display connected to HDMI-A-1-0 do not support this profile (3840x2160 30.000000Hz).
Cannot set profile 2d8f98d91c740983b8ad03f18d8b578d32d0a8ac - all 3.
Cannot set any profile, claiming the monitors do not support the resolution, even if that profile is already active and working. Note that my computer randomly "looses" profiles, i.e. only two of the 12 (but really 10) profiles listed in the dump above are actually available in display settings. Also note that the "all 3" profile is active, in spite of the flag saying otherwise.
$ dpkg-query -l xf* | grep -i '^ii' --color=no
ii xfburn 0.6.2-1 amd64 CD-burner application for Xfce Desktop Environment
ii xfce4-appfinder 4.14.0-1 amd64 Application finder for the Xfce4 desktop environment
ii xfce4-cpugraph-plugin 1.1.0-1 amd64 CPU load graph plugin for the Xfce4 panel
ii xfce4-dict 0.8.3-1 amd64 Dictionary plugin for Xfce4 panel
ii xfce4-indicator-plugin 2.3.4-0ubuntu2 amd64 plugin to display information from applications in the Xfce4 panel
ii xfce4-mailwatch-plugin 1.2.0-3 amd64 mail watcher plugin for the Xfce4 panel
ii xfce4-netload-plugin 1.3.2-1 amd64 network load monitor plugin for the Xfce4 panel
ii xfce4-notes 1.8.1-3 amd64 Notes application for the Xfce4 desktop
ii xfce4-notes-plugin 1.8.1-3 amd64 Notes plugin for the Xfce4 desktop
ii xfce4-notifyd 0.4.4-1 amd64 simple, visually-appealing notification daemon for Xfce
ii xfce4-panel 4.14.3-1 amd64 panel for Xfce4 desktop environment
ii xfce4-panel-profiles 1.0.10-0ubuntu1 all layout manager for the Xfce panel
ii xfce4-places-plugin 1.8.1-1 amd64 quick access to folders, documents and removable media
ii xfce4-power-manager 1.6.6-1 amd64 power manager for Xfce desktop
ii xfce4-power-manager-data 1.6.6-1 all power manager for Xfce desktop, arch-indep files
ii xfce4-power-manager-plugins 1.6.6-1 amd64 power manager plugins for Xfce panel
ii xfce4-pulseaudio-plugin:amd64 0.4.3-0ubuntu1 amd64 Xfce4 panel plugin to control pulseaudio
ii xfce4-screensaver 0.1.10-0ubuntu1 amd64 screen saver and locker that is integrated with the xfce4 desktop
ii xfce4-screenshooter 1.9.7-1 amd64 screenshots utility for Xfce
ii xfce4-session 4.14.2-0ubuntu1 amd64 Xfce4 Session Manager
ii xfce4-settings 4.14.3-0ubuntu1 amd64 graphical application for managing Xfce settings
ii xfce4-statusnotifier-plugin 0.2.2-1 amd64 plugin to display status notifiers in the Xfce4 panel
ii xfce4-systemload-plugin 1:1.2.3-1ubuntu1 amd64 system load monitor plugin for the Xfce4 panel
ii xfce4-taskmanager 1.2.3-0ubuntu1 amd64 process manager for the Xfce4 Desktop Environment
ii xfce4-terminal 0.8.9.1-1 amd64 Xfce terminal emulator
ii xfce4-verve-plugin 2.0.0-1 amd64 Verve (command line) plugin for Xfce panel
ii xfce4-weather-plugin 0.10.2-0ubuntu0.20.04.1 amd64 weather information plugin for the Xfce4 panel
ii xfce4-whiskermenu-plugin 2.4.3-1 amd64 Alternate menu plugin for the Xfce desktop environment
ii xfce4-xkb-plugin 1:0.8.1-2 amd64 xkb layout switch plugin for the Xfce4 panel
ii xfconf 4.14.1-1 amd64 utilities for managing settings in Xfce
ii xfdesktop4 4.14.2-1 amd64 Xfce desktop background, icons and root menu manager
ii xfdesktop4-data 4.14.2-1 all Xfce desktop background, icons and root menu (common files)
ii xfig 1:3.2.7b-2 amd64 Facility for Interactive Generation of figures under X11
ii xfig-doc 1:3.2.7b-2 all XFig on-line documentation and examples
ii xfig-libs 1:3.2.7b-2 all XFig image libraries and examples
ii xfonts-75dpi 1:1.0.4+nmu1 all 75 dpi fonts for X
ii xfonts-base 1:1.0.5 all standard fonts for X
ii xfonts-encodings 1:1.0.5-0ubuntu1 all Encodings for X.Org fonts
ii xfonts-scalable 1:1.0.3-1.1 all scalable fonts for X
ii xfonts-utils 1:7.7+6 amd64 X Window System font utility programs
ii xfpanel-switch 1.0.10-0ubuntu1 all transitional package
ii xfsprogs 5.3.0-1ubuntu2 amd64 Utilities for managing the XFS filesystem
ii xfwm4 4.14.1-0ubuntu1 amd64 window manager of the Xfce project