I have created a MKV file which includes subtitles. My TV accepts the MKV file (video and audio are fine) but I am unable to switch on the subtitle. Which button on the remote control or where in the TV GUI can I switch on the subtitle for MKV playback?

If it is not possible (yet), is there comming a firmware release which is able to handle MKV subtitling?

Model: 32PFL9606H/12
Firmware: Q5551-