Fixed
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Alpine: the logon screen came up and nothing typed. No keyboard, no mouse, and not even Ctrl+Alt+F1 -- because the X server holds the console in graphics mode and hears nothing at all. The X server finds its input devices through udev; Alpine runs mdev, and
xorg-server's need forlibudev.sois answered bylibudev-zero, a stub that reports no devices. The screen is drawn, and the machine is deaf.install.sh --fullnow installseudevalong with the X server and, on a machine that is not on udev already, runssetup-devd udevto move it over.
If a machine is in that state right now, this is the cure (over SSH, since the console cannot type):
doas sh -c 'apk add eudev && setup-devd udev && rc-service l2kdm restart'
curl -fsSL https://jacktulli.github.io/w2k | sh