for some reason after latest kernel/nvidia and other updates on my 12.04.5 LTS running kernel Linux ThinkPad-W520 3.13.0-43-generic #72~precise1-Ubuntu SMP Tue Dec 9 12:14:18 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux all my hotkeys such as volume, mute even brightness stopped working

both on my laptop and via my usb keyboard (thinkpad too) connected via USB

I tried to google and search here but couldn't find exact matching problem except this similar question which doesn't have an answer too

  • try updating the driver softwares of your laptop. – Ali786 Dec 22 '14 at 9:20

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