After some time I am back to:
hcitool lescan
Set scan parameters failed: Input/output error

Issuing
hcitool cmd 0x03 0x0003
< HCI Command: ogf 0x03, ocf 0x0003, plen 0
> HCI Event: 0x0e plen 4
  02 03 0C 00

helps again, but I still can't find any BLE devices with hcitool lescan. 
Nevertheless the i/o error is gone and btmon also doesn't report any error.
Sadly the result is still a non functional lescan ...

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https://bugs.launchpad.net/bugs/1870837

Title:
  hcitool lescan says 'Set scan parameters failed: Input/output error'

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