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I recently installed Ubuntu 22.04 on my new Toshiba Tecra A50-K and some of the Fn keys do not work. They don't even register when pressed with the Fn command. Specifically the brightness keys Fn+F6, F7 and other keys like F8, and F9.

I have tried a lot of solutions available on the internet but none of them are working.

Ajay
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Divyajyoti
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  • What is the debugging output you get from https://unix.stackexchange.com/a/6231/524752 ? – Daniel T Jan 26 '24 at 19:37
  • @DanielT It is not allowing me to post the entire output in the comment. It is the same as the one given on the link. Also, I don't know how this output will help solve the issue since the problem is not with the entire keyboard but only with these specific keys. – Divyajyoti Jan 28 '24 at 19:00
  • Please run sudo apt install evtest then sudo evtest and select your keyboard from the list. Then press the function keys and post what new output appears. Also run xev, press the function keys, and post the new output. – Daniel T Jan 28 '24 at 21:45
  • @DanielT When I press other keys, it detects the inputs but when I press the above-mentioned keys, there's no input detected. It does not even respond to the key press. – Divyajyoti Feb 04 '24 at 23:01
  • Then there is nothing Linux can do. Check in BIOS if something disabled those keys. Some keyboards also have a key to make lock keys or make the function keys do other things like brightness – Daniel T Feb 05 '24 at 03:44

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For now, I have created a cutomized shortcut using xdotool. I took help from the answer on this link https://askubuntu.com/a/305803/1017697 and have managed to add some more additional information here.

First find the keycode for brightness. This can be done by using xmodmap -pke with grep for keyword search

xmodmap -pke | grep -i brightness

This gives the output something like this:

keycode 232 = XF86MonBrightnessDown NoSymbol XF86MonBrightnessDown
keycode 233 = XF86MonBrightnessUp NoSymbol XF86MonBrightnessUp
keycode 237 = XF86KbdBrightnessDown NoSymbol XF86KbdBrightnessDown
keycode 238 = XF86KbdBrightnessUp NoSymbol XF86KbdBrightnessUp
keycode 251 = XF86MonBrightnessCycle NoSymbol XF86MonBrightnessCycle
keycode 252 = XF86BrightnessAuto NoSymbol XF86BrightnessAuto

Now, go to settings and create a new shortcut with

Name: Brightness Up
Command: xdotool key XF86MonBrightnessUp

and map it to the F6 key. Similar steps for brightness down.

Divyajyoti
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