Tvheadend

My guess would be a kernel update has killed your drivers, something like that. Look at syslog to see what that says, and look at your update history or reboot to an earlier kernel to see what's changed recently.

I would agree but the update was for language translations ...nothing else...
When i look in dmesg, adapter ddbridge and digital device card0 are here like in /dev/

Did you try rebooting again? I had this happen to me the other day and a second reboot fixed it. No idea why.

Failing that I'd still try reinstalling the drivers, because they might need to be rebuilt for some reason.

I tried all that you said....
i also install DVBlink server, it found my 4 tuners...
I made a copy of the system, now i have installed a brand new one.
I will do this: first, all updates,reboot, then drivers, reboot and finally tvheadend and reboot...
After i will compare logs etc to verify if something is "different" between both install...

Hi

After exploring files, i found that: linked option was selected for two tuners of the card...I don't remember anything about that...
I dont even know what is linked option for... I disabled linked option , one reboot and guess what, all my tuners came back

;o)