After I upgraded my udev package from udev-175-i486-1 to udev-182-i486-1 the keyboard stopped working in X; the mouse still works.

Xorg.0.log for both contain:

(II) Using input driver 'evdev' for 'Keyboard0'
(**) Option "CoreKeyboard"
(**) Keyboard0: always reports core events
(EE) evdev: Keyboard0: No device specified.
(EE) PreInit returned 2 for "Keyboard0"
(II) UnloadModule: "evdev"


with udev 175 this happens:
(II) config/udev: Adding input device Power Button (/dev/input/event5)
(**) Power Button: Applying InputClass "evdev keyboard catchall"
(**) Power Button: Applying InputClass "keyboard-all"
(II) Using input driver 'evdev' for 'Power Button'
(**) Power Button: always reports core events
(**) evdev: Power Button: Device: "/dev/input/event5"
(--) evdev: Power Button: Vendor 0 Product 0x1
(--) evdev: Power Button: Found keys
(II) evdev: Power Button: Configuring as keyboard

and much more dealing with the keyboard; with udev 182 the mouse gets added next, the keyboard is never mentioned again.

have you installed new packages that was added in the last few days?

Slackware-current running fine here. Like willysr said maybe run slackpkg install-new.

udev started to depend on kmod beginning with 1.82; also it started using /run/udev instead of /dev/.udev . I didn't even have a /run directory. Installing kmod and creating /run/udev solved the problem.