@anon13373109 Thanks this worked!
$ cat /sys/module/hid_apple/parameters/fnmode
1
$ echo 0 | sudo tee /sys/module/hid_apple/parameters/fnmode
[sudo] password for user:
0
After changing this to zero, the Fn+Fx started registering as function keys, so I was able to flip consoles with Ctrl+Alt+Fn+Fx
.
I then pressed Fn+X+L
for four seconds (to switch on function key lock) and it worked, so I am able to use simply Ctrl+Alt+Fx
.
Really appreciate your help on this @anon13373109.