Importing subkeys from smartcard

[Joke de Buhr]

hi,

if I transfer my smartcard to an new host I can run 
  gpg2 --card-edit
    fetch

to import my public key from a keyserver. But if done so gnupg doesn't 
recognize the private subkeys stored on the smartcard. How do I tell gnupg 
where it should look for the private subkeys?
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