Sony VAIO VGX-TP1 Series User Manual page 48

Connecting with a cable or satellite set-top box (STB)
You can connect your computer to cable service access that uses a set-top box (cable or satellite). When using the set-top
box (STB) setup, you can only change channels through the STB, using its controls or the supplied remote commander.
When using the STB setup:
A standard TV remote control cannot be used to change TV channels. You can use your TV remote control to set the TV
to the channel-out number (channel 3, 4, etc.) or direct video input specified by your cable or satellite service provider.
You may be able to use a universal remote control or commander to change TV channels, if the device is capable of
controlling the STB.
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Using Your VAIO Computer