fpkbd is a keyboard driver for ThinkPad T25 keyboard installed into ThinkPad T480.
Using the standard atkbd + thinkpad_acpi drivers, the keyboard will work as follows:
| Key | Expected Behavior | Actual Behavior |
|---|---|---|
| Microphone mute | Microphone mute | Nothing |
| Fn + F1 | Nothing | Mute |
| Fn + F2 | Screen lock | Volume down |
| Fn + F3 | Battery status | Volume up |
| Fn + F4 | Suspend | Microphone mute |
| Fn + F5 | Touchpad settings | Brightness down |
| Fn + F6 | Camera settings | Brightness up |
| Fn + Home | Brightness up | Nothing |
| Fn + End | Brightness down | Insert |
| Fn + PgUp | Keyboard backlight | Nothing |
| Fn + Space | Zoom | Keyboard backlight |
| Fn + Left | Previous track | Home |
| Fn + Right | Next track | End |
| Fn + Up | Stop playback | Nothing |
| Fn + Down | Play/pause | Nothing |
Unfortunately, it's impossible to do anything with keys which don't produce any event, which means that Microphone mute, Fn + Home, Fn + PgUp, Fn + Up, and Fn + Down are lost forever without patching EC.
With fpkbd, the keyboard will work as follows:
| Key | Expected Behavior | Actual Behavior |
|---|---|---|
| Microphone mute | Microphone mute | Nothing |
| Fn + F1 | Nothing | Microphone mute |
| Fn + F2 | Screen lock | Screen lock |
| Fn + F3 | Battery status | Battery status |
| Fn + F4 | Suspend | Suspend |
| Fn + F5 | Touchpad settings | Touchpad settings |
| Fn + F6 | Camera settings | Camera settings |
| Fn + Home | Brightness up | Nothing |
| Fn + End | Brightness down | Nothing |
| Fn + PgUp | Keyboard backlight | Nothing |
| Fn + Space | Zoom | Keyboard backlight |
| Fn + Left | Previous track | Brightness down |
| Fn + Right | Next track | Brightness up |
| Fn + Up | Stop playback | Nothing |
| Fn + Down | Play/pause | Nothing |
Since Fn + F1 is unused on T25 keyboard, I decided to remap it to microphone mute button. I also decided that it will be a good idea to remap brightness control keys to Fn + Left and Fn + Right. Keyboard backlight is toggled by Fn + Space which is good as well. The rest keys work as expected.
Run make to build the kernel module and then run insmod fpkbd.ko to install the module.
You can also use DKMS and provided dkms.conf.
Fn + F4 is handled by thinkpad_acpi module. You can remap the key placing the following udev hwdb
rule into /etc/udev/hwdb.d/90-thinkpad-keyboard.hwdb:
evdev:name:ThinkPad Extra Buttons:dmi:bvn*:bvr*:bd*:svnLENOVO*:pn*
KEYBOARD_KEY_1a=sleep