Many many thanks sky42 your script has worked a treat!
I am running a new n100 with libreelec latest nightly on 12.2 (19th Jan-26).
Using it for hdr and hit the intel faults with either no sound or a black screen - trying to play or stopping playing HDR. I have reduced it down to 10bit but whilst that improved things, it was still happening 50% or more. So having a button to refresh the hdmi signal is perfect - especially for the rest of the fam.
Fingers crossed for a perm fix with intel, I know chewitt is keeping any eye, but not keeping up too much hope (understandable)?
Everything is now working perfectly. If on the start of a movie the hdmi handshake fails or the audio drops, press the button on the remote - and all is back to normal. Not flawless, but very close, and a compromise I am willing to take for the speed and performance vs RPI5. Bootup is sub 5 secs.
However I did test a recent nightly on 13 and had to go back to 12.2 as the all hdr was unwatchable due to stuttering. Will try again on a later nightly, but for now sky42 has made a massive difference. Thank you once again.