Updates may/should solve your sound issue
Start→All Programs→Windows Update.
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You can download the driver from the manufacturer's website. Go to site and search for your model number. The download is free of charge under support tab.
Please let me know if you have questions.
SOURCE: Panasonic CF-51 Toughbook Fn keys don't work at all
The following website contains the needed drivers:
https://eww.pavc.panasonic.co.jp/pc/cgi-bin/itn/toughbook/dl01.cgi
Select your model of CF-51 Toughbook, but you MUST be specific. There are about nine variations of the CF-51 so you must use the right drivers.
Download the hkeyapp, hkeyset, and hotkey files and unpack all files. Use the default unpack locations. If you download the files for a laptop version that is not your own, when you try to run any of these files the computer will tell you that the file is not for your model. If the files successfully unpack then you know you have the right files.
For hkeyset and hkeyapp you must run the set-up applications in the unpacked folders.
Go to Control Panel>System>Hardware>Device Manager and go to Other Devices.
The Hotkeys will appear as an "Unknown Devices" so if there is more than one, right click and choose "Update Driver".
Select "Install driver from specific location" and direct it to "C:\util2\drivers\hotkey" folder.
The computer will find the file and install the driver after which point you must restart the computer.
Hope this helps. It took me a while to figure this stuff out on my own so hope it speeds up somebody else's attempt.
Andrew
SOURCE: Toughbook CF-51 Sound
I recently tried a dual boot with Windows7/Ubuntu 9.10. I lost audio despite all efforts in both of those operating systems until I reinstalled XP.
Still I had no sound until I installed a correct HOTKEY driver off the panasonic web site. Apparently there is an important switching function by this driver (?!) that is required. BEWARE OF THIS!
My system: CF-51LCMDDBM Mk2ll
SOURCE: Installed Windows 7 on Panasonic Toughbook CF-51
..install an audio driver, it is found on the DVD package..
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