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I'm using a Lenovo SL500 for several years now and suddenly the Volume keys stopped working. It could be that a kernel updated caused it - I don't know.

However when I go to the keyboard settings -> Shortcuts -> Sound and Media, I can set e.g. Volume Mute with my multimedia key and then it says "AudioMute". But when I later hit the Volume Mute key nothing happens.

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Maybe your volume/mute keys got reassigned to some other program? –  Pavel Dec 7 '13 at 10:33
    
How can I check this? –  tauran Dec 8 '13 at 15:36
    
askubuntu.com/questions/24916/how-do-i-remap-certain-keys –  Pavel Dec 8 '13 at 16:05
    
I tried a new user account and there everything was ok. So it's definitely a settings problem. However xmodmap -pke gives the same output in both user accounts. –  tauran Dec 11 '13 at 15:36
    
It's a bug, see here................ bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/… –  seamus Jul 9 at 23:01

2 Answers 2

up vote 1 down vote accepted

Resetting media key prefrences worked for me

dconf reset -f /org/gnome/settings- daemon/plugins/media-keys/

if it does not work maybe you should try

dconf reset -f /org/gnome/settings- daemon/plugins
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I found a solution: deleting ~/.pulse then logout. Next time it happens I will try the other answer too.

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This has fixed my problem, but you must reboot the computer, not just logout, or you may find all the sound controls to be quite broken. I recommending taking a backup of .pulse incase you need to revert. –  Steve May 30 at 8:40

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