udev appears slow to process Yubikey uevents

[bryzinga]

Hi there! Been a while since my last issue.

I currently am running into issues with my Yubikey 5C. Whenever I plug it into my laptop, it seems to take 15-20 for it to be usable by other applications such as KeePassXC and GPG.

Running programs such as "ykman" or "gpg --card-status" always fail to recognize the Yubikey for the first 15-20 seconds it is plugged in. When I run "pcscd -a -d -f", nothing gets output either for the first 15 seconds. But when I run "udevadm monitor", the kernel is clearly recognizing the device and populates two hidraw devices in /dev, but udev seems to be the one that takes forever to actually do anything with it (such as applying rules). I don't experience this issue when I boot a live Fedora image on my laptop or on my desktop running Arch, so I'm fairly confident this is an issue with udev and Gentoo, whether of my own misconfiguration or something else. I've done several searches with various terms, but I can't seem to find anyone else with the same problem on any Linux distro. This is really more of a convenience issue than a functional issue, since I have been accustomed to always plug in my Yubikey the second I need it, so I'm morealess peeved that it works fine elsewhere but not on my laptop.

I have pcscd added to my default runlevel and set to hotplug in the OpenRC conf file, as well as making sure that GPG was configured correctly as shown in the wiki article: https://wiki.gentoo.org/wiki/YubiKey/GPG . I also have tried installing Yubico's udev rules in /etc/udev/rules.d/: https://github.com/Yubico/libfido2/blob/main/udev/70-u2f.rules . I don't believe it's an issue with any other application either as the issue occurs in a TTY without any graphical applications running.

Something interesting I notice when monitoring udev is that when I plug in my Yubikey and immediately unplug it, udev will still register the device 15-20 seconds after it was first plugged in, then immediately de-register it:

[bryzinga]

Hi all! Does anyone happen to have an idea or know where else I can look to solve this? I appreciate any help!

[mturnbull]

Hi all! Also no solutions just yet, but also experiencing this issue. i don't have a yubikey 5c, but rather a 5 NFC, and plugged in through a USB-A to USB-C adapter (Framework 16 laptop). I thought this was a hardware issue for a few months, but seeing this posted here gives me hope it's a configuration issue. Might be worth adding that I've used the same Yubikey (not just the same model, but the same one) on multiple other computers (mostly Debian or Ubuntu, one Windows) without seeing this issue.

Time permitting, I'll see if I can mess around with udev rules, but it may be a few days before I can get to that... :/

Interestingly, though `gpg --cardd-status` doesn't work for sometimes upwards of 60 seconds, a `ykman info` can read the device's serial number instantly. I wonder if this may be a useful lead?
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