gpg-agent caching with smartcard

[Tapani Tarvainen]

I can't seem to make gpg-agent cache smartcard PIN at all,
whether signing, decrypting or authenticating ssh.
All of those work fine otherwise, but I have to enter the PIN 
every time.
I did set "signature PIN" to "not forced" in the card.

I am using subkeys, which may or may not be relevant,
gpg version 1.4.2, gpg-agent 1.9.20

Searching I found only one reference to similar problem, with
no solution:

http://lists.gnupg.org/pipermail/gnupg-devel/2005-March/021888.html

Is this a bug, or am I missing something?

-- 
Tapani Tarvainen