Smartcard power-down

[the2nd at otpme.org]

Hi,

i found this thread 
(https://lists.gnupg.org/pipermail/gnupg-users/2014-September/050811.html) 
pointing out that a "gpgconf --reload scdaemon" should power-down a 
connected smartcard and thus lead to re-asking the PIN. I've tried this 
with a yubikey neo but does not work. I've also tried sending SIGHUP to 
scdaemon as well as gpg-agent but i never get re-asked for the PIN when 
doing a ssh login. After restarting gpg-agent i always get asked for the 
PIN so it seems to work in general. Is there anything i can check?

regards
the2nd