Out of curiosity I’m checking out LineageOS at the moment, so far thumbs up .
But FM radio doesn’t work for me. I wiped my phone, had to format data because of encryption, and then installed lineage_FP2-ota-2017-06-14.zip, modem-17.06.4.zip and open_gapps-arm-7.1-pico-20170715.zip via TWRP.
The stock App is giving me “Process failed. If the problem persists, please turn FM off and on.”
Turning it off and on doesn’t help. I also tried forcing turn off and clearing App data and cache in Settings. Restarting the phone doesn’t help either.
And earphones are connected as antenna, as it prompts for this if they aren’t (so at least the earphone connection gets detected).
To check whether it is perhaps the App’s fault, I also tried SpiritF (free Open Source Spirit2 FM) from here, which doesn’t work, too …
Now what to do?