Aaron, Edd, thank you! The issue is resolved now. GnuPG works fine after I've enabled pcsc daemon and added necessary line to ~/.gnupg/scdaemon.conf.
Thanks to all who tried to help, and sorry for the noise. My Yubikey worked fine without pcscd for more than a year, that was misleading. On 04/17, Aaron Bieber wrote: > FWIW it works fine for me: > > Yubikey 4: > λ gpg2 --card-status > > Reader ...........: Yubico Yubikey 4 OTP CCID 00 00 > > Yubikey Neo: > λ gpg2 --card-status > Reader ...........: Yubico Yubikey NEO OTP CCID 00 00 > > I am using security/pcsc-lite and security/ccid. -- With best regards, Pavel Korovin