I don't think its due to missing drivers. I was able to mount my old sdcard manually via terminal just fine (think even vold did as well).
Just the android file browser or some applications had issues to access the card directly.
Don't ask me why
but i think it's the document provider not beeing able to, well , provide files from the exfat mounted sdcard.
So i moved everything via terminal to internal storage, then formated the sdcard as ext device via settings dialog. SDcard was accessible after that (for instance TB had access again) - so i moved files back and since then enjoy my linos
Just the android file browser or some applications had issues to access the card directly.
Don't ask me why
So i moved everything via terminal to internal storage, then formated the sdcard as ext device via settings dialog. SDcard was accessible after that (for instance TB had access again) - so i moved files back and since then enjoy my linos