Проблема распространенная.
Если громкость достаточная fn+F5,F6, то надо переустановить драйвер горячих клавиш, а не звуковой карты.
Panasonic Hotkey Appendix Application.
You MUST install all Hotkey drivers and software for the blue function keys, and the buttons on front of unit, to work.
Install the Hotkey Driver first and this file last.
Вот оно:
Re-install this driver if the sound stops working from the speaker and the Fn+F4 icon does not appear on screen when pressed.
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