I have encountered in latest LE 13 Nightly on RPi 4B ( LibreELEC-RPi4.aarch64-13.0-nightly-20241101-5b3a206 ) the KEY_SUBTITLE devinput action in Kodi was changed, when watching the Live TV or video recordings.
In past it was simply toggling on/off the subtitles, now the subtitle configuration menu is open and the selection must be made. This is very annoying.
Probably it's a change in Kodi (Build 22.0-ALPHA1 21.90.700). If anybody has a comment related to this change, I would be glad to be informed.
Currently I don't have a registration in Kodi forum, also for the case it should be related to LE instead, I am opening this thread here.
I can fix that by remapping the IR Remote key to keyboard's "t" button ( kodi-send --button="t") but I believe this recent KEY_SUBTITLE behavior change is a nonsense...
So if anyone of developers could revert it back somehow, please do it, I am sure it would be a best solution.
irw output: 172 0 KEY_SUBTITLE devinput
Now points to: DialogSelectSubtitle (description: Open a window dialog to select a subtitle stream. (v22 Piers addition))
In past it was probably pointing to: ShowSubtitles (description: Toggles whether subtitles are shown or not.)
Another option which would make sense: NextSubtitle (description: Change to the next subtitle language, if there is more than one.)
It's at line 201 of the /usr/share/kodi/system/keymaps/remote.xml file.
The quick fix is to copy that file to /storage/.kodi/userdata/keymaps folder and edit line 201 to <subtitle>ShowSubtitles</subtitle>
then reload keymaps with the kodi-send --action="reloadkeymaps" command.
BTW. the positioning of subtitles (invoked by CTRL+t on keyboard ) does not work and AFAIK it never worked, also in manual mode the subtitle's positoning does not work.