The data screen is not supported in either pvr.nextpvr or the API to the backend. never saw the point to implementing providers as it is mainly cosmetic.
FYI in Tvheadend this works fine; if such items are in Kodi, it would be fine to be supported by add-ons as well - it's useful at least for debugging because from Kodi you can't see this info elseewhere (AFAIK) and sometimes you need it.
The signal strength info can be of value but only for digital tuners and is not multi-platform and is sometimes incorrect. I know when my signal is bad by watching but no doubt technical users who are used to it will miss it.
Well, this looks to be a common Kodi's issue. I have reported that in LE forum a couple years ago but nobody from devs cared about it. So I had to make a custom scripts for my tuners that show that info correctly in right top corner when I activate it by button like you see on screnshot in post #14.
Watching TV and doing an EPG update is not supported and will cause issues. If you must do it issue a pkill DeviceHostLinux in PostUpdateEPG.sh
I understand but it "repaired" the tuning (I suppose temporarily and after reboot or NPVR service restart it won't work again).
Thanks for the additional info regarding to PostUpdateEPG.sh.
I don't know how this works in Tvheadend but it's much better for sure (except the occassional EPG database corruption/screwing).
Perhaps you should consider looking for (conditional, configurable) EPG update after switching channels (switching channels in NPVR is very slow anyway, if it ever works, compared with Tvheadend).
QuoteNextPVR logs would tell us why only on frequency is being scanned.
The log posted earlier, hopefully it should be there.