SCR3310 reader working for root, but not scard group

[Todd A. Jacobs]

The following line in gnupg-ccid.rules will now create the /dev node
with the correct permissions, but the card reader itself still remains
inaccessible to non-root users:

ACTION=="add", SUBSYSTEM=="usb", ENV{PRODUCT}=="4e6/511f/*", GROUP="scard"

This seems like a simpler way to assign the GID, rather than shelling
out to an external script. Of course, I'm still getting:

$ gpg --card-status
gpg: selecting openpgp failed: ec=6.108
gpg: OpenPGP card not available: general error

which implies the problem wasn't just the device node permissions;
could it be something to do with pcscd itself?