Yubikey, Suspend and Restore

Another one of those quickies that can save you some time. When my Linux laptop resumed from sleep, I was annoyed that DrDuh’s perfect Yubikey setup would throw me the following when I tried to SSH:

sign_and_send_pubkey: signing failed: agent refused operation

Seems like the key doesn’t like being put to sleep and woken up. Another annoyance, for some reason, also when waking up, laptop’s touchpad was disabled. So I put this little script in /lib/systemd/system-sleep:


devpath=$(grep -l 1050 /sys/bus/usb/devices/*/idVendor) # 1050 is yubikey's vendor id
kpath=$(dirname $devpath)/authorized

if [ "${1}" = "pre" ]; then
        echo 0 >$kpath
if [ "${1}" = "post" ]; then
        echo 1 >$kpath
        synclient TouchpadOff=0 # don't turn off my touchpad

Greetings to ssokolow for the tip which I found searching for “reset usb command line”.