Alt+SysReq REISUB not working

Despite the fact that /etc/sysctl.d/99-sysctl.conf contains:
kernel.sysrq=1
and cat /proc/sys/kernel/sysrq confirms this is set by displaying:
1
The magic key combo merely appears to kill the X server and I go back to lightdm greeter for logging back into my XFCE session.
Is there something about XFCE/lightdm I'm not aware of? There does not appear to be any keyboard shortcut overrides.

Holding down Alt+SysRq, I then press REISUB in that order and its the E key combo that appears to restart the X Server.
Looking on-line, I see the following:
E: Send the SIGTERM signal to all processes except init
and then looking in the journal I see:
Mar 16 20:19:34 pc kernel: SysRq : Keyboard mode set to system default
Mar 16 20:19:35 pc kernel: SysRq : Terminate All Tasks
Mar 16 20:19:35 pc systemd-journal[141]: Journal stopped
Mar 16 20:19:36 pc systemd-journal[6946]: Permanent journal is using 327.2M (max allowed 4.0G, trying to leave 4.0G
Mar 16 20:19:36 pc systemd-journald[141]: Received SIGTERM.
Mar 16 20:19:36 pc systemd-udevd[6913]: starting version 210
Mar 16 20:19:36 pc systemd[1]: dhcpcd.service: control process exited, code=exited status=1
Mar 16 20:19:36 pc systemd[1]: Unit dhcpcd.service entered failed state.
Mar 16 20:19:36 pc systemd[1]: systemd-logind.service has no holdoff time, scheduling restart.
Mar 16 20:19:36 pc systemd[1]: lightdm.service holdoff time over, scheduling restart.
Mar 16 20:19:36 pc systemd[1]: Unit lightdm.service entered failed state.
Mar 16 20:19:36 pc systemd[1]: systemd-journald.service has no holdoff time, scheduling restart.
Mar 16 20:19:36 pc systemd[1]: Stopping Journal Service...
Mar 16 20:19:36 pc systemd[1]: Starting Journal Service...
Mar 16 20:19:36 pc systemd[1]: Started Journal Service.
Mar 16 20:19:36 pc systemd-journal[6946]: Journal started
Mar 16 20:19:35 pc dhcpcd[337]: received SIGTERM from PID 0, stopping
Mar 16 20:19:35 pc dhcpcd[337]: enp3s0: removing interface
Mar 16 20:19:35 pc dhcpcd[337]: exited
Mar 16 20:19:35 pc dhcpcd[6921]: dhcpcd not running
Mar 16 20:19:35 pc dbus[6938]: [system] Successfully activated service 'org.freedesktop.systemd1'
Mar 16 20:19:35 pc lightdm[474]: pam_unix(lightdm:session): session closed for user imbjr
Mar 16 20:19:35 pc systemd[1]: Failed to send out specific PropertiesChanged signal for systemd-journald.service: C
Mar 16 20:19:35 pc systemd[1]: Failed to send out specific PropertiesChanged signal for systemd-udevd.service: Tran
Mar 16 20:19:35 pc systemd[1]: Failed to send out specific PropertiesChanged signal for systemd-udevd-kernel.socket
Mar 16 20:19:35 pc systemd[1]: Failed to send out specific PropertiesChanged signal for systemd-udevd-control.socke
Mar 16 20:19:35 pc systemd[1]: systemd-udevd.service has no holdoff time, scheduling restart.
Mar 16 20:19:35 pc systemd[1]: Stopping udev Kernel Device Manager...
Mar 16 20:19:35 pc systemd[1]: Starting udev Kernel Device Manager...
Mar 16 20:19:35 pc systemd[1]: Started udev Kernel Device Manager.
Mar 16 20:19:35 pc systemd[1]: lightdm.service: main process exited, code=exited, status=1/FAILURE
Mar 16 20:19:35 pc systemd[1]: Unit lightdm.service entered failed state.
Mar 16 20:19:35 pc systemd[1]: dhcpcd.service: main process exited, code=exited, status=1/FAILURE
Mar 16 20:19:36 pc systemd[514]: Stopping Default.
Mar 16 20:19:36 pc systemd[454]: Stopping Default.
Mar 16 20:19:36 pc systemd[514]: Stopped target Default.
Mar 16 20:19:36 pc systemd[514]: Stopping Basic System.
Mar 16 20:19:36 pc systemd[454]: Stopped target Default.
Mar 16 20:19:36 pc systemd[514]: Stopped target Basic System.
Mar 16 20:19:36 pc systemd[454]: Stopping Basic System.
Mar 16 20:19:36 pc systemd[454]: Stopped target Basic System.
Mar 16 20:19:36 pc systemd[454]: Stopping Paths.
Mar 16 20:19:36 pc systemd[454]: Stopped target Paths.
Mar 16 20:19:36 pc systemd[454]: Stopping Timers.
some of which might me when I am forced to use the machine's power button.

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