Bug#1053991: Further information
Hi
Since filing the above report, I have been using the 6.1.0-12 
(6.1.0-12-rt) kernel [version 6.1.52-1], on which the system displays on 
both monitors.
This morning I booted the computer and the system was only displaying on 
one monitor.  I checked physical connections and apt update log since 
the last time I used the computer.  I could not see anything obvious to 
explain why I was only getting one monitor.
As an extreme measure, I reinstalled Debian, formatting / and /swap 
partitions but keeping /home.
The system rebooted into 6.1.0-13 [version 6.1.55-1], which displayed on 
both monitors and is expected behaviour.
I'm guessing the problem lies elsewhere so please feel free to close the 
bug.
Kind regards,
R
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