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HP Compaq Pro 6300 and Elite 8300 All-in-One PCs - Capacitive Sensor Buttons Do Not Work

Environment
HP Compaq Elite 8300 All-in-One Desktop PC series
HP Compaq Pro 6300 All-in-One Desktop PC series
Windows 7
Windows 8
No PS/2 peripheral is connected to PC
Questions/Symptoms
Front panel buttons do not work
Capacitive Sensor buttons do not work
Manual installation of Windows operating system
Cause
The front panel of the Elite 8300 AiO and Pro 6300 AiO contains a group of capacitive sensor (aka "capsense") buttons that allow the modifaction of settings such as Volume, Mute, and Brightness. These buttons are controlled via PS/2 scan codes. Unless a PS/2 keyboard or mouse is attached prior to Windows loading, these buttons will not function without the inclusion of a certain registry key. This key is included in the HP factory image. However, a manual installation of the OS may not include this key.
The following image shows the location of these capsense buttons:
Answer/Solution
Download and install SoftPaq 60481. This SoftPaq will add the registry key which enables support for hot-plugging PS/2 devices (such as the capsense buttons). Click here to access "HP All-in-One Panel Button Support for Windows ".
  note:
As of the creation of this article, the SoftPaq's Release Notes imply support for Windows 8 only. However, this SoftPaq has also successfully resolved this issue in Windows 7.

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