I have a new Slackware 14.1 system on which I'd like to use a Logitech MK520 wireless keyboard and mouse but I can't get it to work. The keyboard works fine while booting at the lilo prompt, but after the system starts the keyboard and mouse are ignored both in a terminal and KDE.

I have two MK520's, same symptoms with both.
Running Ubuntu 14.04 booted from a USB stick, they work fine.
They work fine on a Slackware 13.1 system, and a Win7 system.

Any ideas?

Will it start working later if you unplug usb rf device and plug it back in? If so you may then be able to update your install. Slight chance this will fix it.

Do you have bluetooth enabled at startup? I have the exact same kb & mouse and it works fine.

I have the same KB & Mouse and it works perfectly fine on 14.1 64-bit.

@jefro: Tried unplugging/replugging the USB RF module, no joy. Tried booting with it plugged in, no go. Tried booting without it plugged in and plugging it in later, no effect. Tried it with conventional USB keyboard & mouse with/without RF module with all above permutations, no effect. Conventional KB/mouse works no matter what, mk520 never does (neither of them).

@zrdc28: I have no idea if bluethooth is on or not, nor do I know how to find out. Note that although it uses a 2.4 GHz radio, it is not a bluetooth device. Assuming that perhaps bluetooth is relevant, the motherboard (Asus Z97 Deluxe) does have integrated bluetooth. Could this be a factor?

@bassplayer, does your system support bluetooth?

The MK520 is not a blue tooth device, but an 2.4 GHz RF device. Although not advertized, all the MKxxx kb/mouse combos work just spiffy with all Linux distros. Here are some steps to troubleshoot:

1. Does the kb work after boot but before you run "startx"? If so, then X.org is the culprit. (If you set your runlevel to go directly to a GUI login, don't!)
2. If needed plug in a std ps/2 or usb kb, run "lsusb" to see if your unifying receiver is detected. It should be, mine is.
3. The MK520 uses a unifying receiver and that may have gotten confused when initially paired. see also: https://wiki.archlinux.org/index.php...fying_Receiver

Have fun!
Ed

To reiterate the symptoms:

Two separate devices (by which I mean two separate keyboard/mouse pairs) work flawlessly with Slackware 12.2, Slackware 13.1, and of course Windows 7. Neither works with vanilla 14.1 kernel 3.10.17 beyond the LILO prompt. When presented with the login prompt nothing happens when striking any keys on the keyboard(s). This is on tty1 (through 6 presumably but I can't switch ttys either). Using runlevel 3 so X isn't loaded; although it doesn't work when the GUI is booted either.

I don't recall the device ID but lsusb did list a "Logitech, Inc. Unifying Receiver".

However!

I installed the 3.14.12 kernel from -current after seeing a similar problem involving a Logitech wireless keyboard in this thread, and my keyboard & mouse now work fine. I now have a small display issue, but that's a matter for another thread. Accordingly, I'm marking this thread as [Solved]. Thanks for the suggestions, all!

As a further followup on this, the MK520 does not work with the Slackware 14.1 install DVD, either.