Logitech Presenter R400 Keys in Linux Mint 16/Petra (KDE)

In general the Presenter R400 works fine, it’s immediately active after the USB receiver is plugged in and the large keys representing Page Up/Down are working out of the box, thus presentations in LibreOffice/OpenOffice, PDF Viewer (in my case Okular) and Google Docs are stepping forward and backwards using the main keys.

In contrast the smaller keys for jumping to presentation mode and disabling the display are sending codes, that my KDE desktop can’t process.

The solution in my case (Linux Mint 16/Petra, KDE Desktop) was a change in the file /lib/udev/hwdb.d/60-keyboard.hwdb, which contains a section for Logitech Presenter R400:

# Logitech Presenter R400
keyboard:usb:v046DpC52Dd*dc*dsc*dp*ic*isc*ip*in00*
 KEYBOARD_KEY_070029=esc
 KEYBOARD_KEY_07003e=f5
 KEYBOARD_KEY_070037=b
#KEYBOARD_KEY_070029=presentation
#KEYBOARD_KEY_07003e=presentation
#KEYBOARD_KEY_070037=displaytoggle

To activate the changes without reboot, I used the following two commands (update hwdb.bin file and reload it), followed by reconnecting the USB receiver:

udevadm hwdb --update
udevadm control --reload

Cable & Connector Quiz

After I dumped some stuff in my attic containing cables and connectors of the good old PC times, I wonder, if I should not put them into the next Tabaluga Box or try to setup an interesting game for serious nerds:

  • Put a collection of ancient stuff, let’s say 10 cables with old SCSI or IDE/Floppy connectors including all forms of cables with Sub-D-connectors (SCSI, Serial, Parallel) into a closed box. And don’t forget these “interesting” tiny connectors for IDE-CDROMs and sound cards.
  • If it’s your turn, get a cable out of the box (the first you get your hands on, no reselection, eyes closed).
  • You have now a pre-defined time to identify the cable/connectors.
  • All others decide, if you are wrong or not.
  • Several levels of Difficulty
    1. More time, you can use all senses. Internet access?
    2. Less time
    3. Eyes closed, lights out, whatsoever, only tactile
    4. Put cable into life on real ancient hardware and prove your theory.

Of course for level 4 you will also need a running system with IDE disks, legacy ports, internal and external Fast SCSI devices etc.

Asus O!Play Collection

Got a present recently, a discarded O!Play Mini.

Looking at the specs, it’s comparable to the HDP-R1¬†looking at the input/outputs and formats, but nevertheless I will have a look at it, perhaps the gap to the current release 1.16 is big enough for a little upgrade session.

A day later I recognized, that there is no LAN connectivity on the Mini, so it’s nice for USB storage, but not of much use in my typical environment with recordings on a central VDR/NAS system.