@werner @ikloecker Any more thoughts / updates on this?

Just got around to testing this on Linux, and I can confirm the same behavior: decryption PIN caching works on 2.2 and doesn't work on 2.3.

@znull You can also fix the detection issue by building with ./configure --disable-ccid-driver, in which case you won't need the disable-ccid setting anymore.

@ikloecker Sorry for not being clear, I was not aware different operations have different behaviors in regard to entering / caching the PIN.

So I did a bit more reading on smartcard PIN caching, and took a better look at the debug logging of gnupg 2.2, and learned that, indeed, the PIN is cached by the card and not by any one gnupg component.

Yes, I already linked to T5415, but that breaks YubiKey completely, and I fixed it with disable-ccid.