Panasonic Toughbook CF-31AAA7J1M Reference Manual page 3

Introduction
Regarding Windows 7
Sound and video
Sound (e.g. MP3, WMA) and video (e.g. MPG, WMV) recorded in PC Cards and SD Memory Cards may be interrupted
during playback. If this happens, copy them to the hard disk drive and play back.
Depending on the processing status on Windows, sound may be interrupted at Windows startup. You can mute the sound at startup.
Right-click the desktop and click [Personalize] - [Sounds].
A
Remove the check mark from [Play Windows Startup sound], and click [OK].
B
When high-frequency sound occurs
If high-frequency sound occurs around keyboard while using the computer, check the settings for the USB power saving function.
A standard user needs to enter an administrator password and click [OK].
Set [USB selective suspend setting] to [Enabled].
Click (Start) - [Control Panel] - [System and Security] - [Power Options].
A
Click [Change plan settings] of the current power plan.
B
In [Change settings for the plan], click [Change advanced power settings].
C
In [Advanced settings], double-click [USB settings].
D
Double-click the displayed [USB selective suspend setting].
E
Change settings of [On battery] and [Plugged in] to [Enabled].
F
Click [OK] and exit the [Advanced settings] screen.
G
Switching the GPU that is used
<Only for the model with Discrete Video Controller>
When you start up the computer for the first time after purchase, the discrete GPU is activated to maintain high performance.
You can manually change the GPU that is used.
1
Log on to Windows.
2
Click on the notification area, and click
3
Select [Switchable Graphics].
4
To switch to the Intel
To switch to the discrete GPU, select [Performance Video] in [Switchable Graphics].
®
GPU, select [Power Saving Video] in [Switchable Graphics].
.
3