Multimedia keys and Xfce

Pétùr peturvilj at
Thu Apr 18 11:11:24 CEST 2019

Thanks a lot for this.

The diff shows no difference even when a key works, and then does not
work after a reboot. the change of behavior appears only when rebooting.

Like I have the two same keyboards (logitech K780), I tried to plug the
older keyboard to my laptop. And it multimedia keys works !

To sum up :

- newer K780 keyboard + laptop : bug with multimedia keys
- old K780 keyboard + laptop or tower : ok

I used a windows computer to install the logitech software. It shows the
older keyboard run firmware 001.004.00028 when newer uses 001.005.00029.

I think this explains the issue. The newer version seems not completely
recognize by linux kernel (I guess). I use 4.19.0-4-amd64.

I also installed last git version of Solaar
( but it doesn't change this.


Le 17/04/2019 à 02:05, Wojciech S. Czarnecki a écrit :
> On Tue, 16 Apr 2019 15:41:45 +0200
> Pétùr <peturvilj at> wrote:
>> Any idea?
> Something is messing with your keyboard map likely.
> After reboot open console and do fresh dump:
> ~$ xmodmap -pke > after_reboot_xmodmap
> Then after your keys stopped working as expected
> do next dump
> ~$ xmodmap -pke > wrongmedia_xmodmap
> Then do diff:
> diff -U0 after_reboot_xmodmap wrongmedia_xmodmap
> If these two dumps differ, you may start to search for culprit within
> programs/scripts ran inbetween.
> If these two are identical it looks 1-unfortunate, or 2-dim, or 3-doom.
> 1. your hw at some point went astray. It happened with some Acers where media keys
> were at chord with 'Fn'. Box somewhat changed scancodes after unknown to
> me Fn-something slip.
> 2. you activated some kind of 'User Experience Feedback' (Chrome?) that mess.
> 3. you've got a rootkit/trojan with buggy keylogger 
> Hope this helps,

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