Sony VGC-LV170J - Manual (Page 78)

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Using Your VAIO Computer
To change the HDMI input volume
Press the Up ( V) or the Down (v) button to increase or decrease the volume.
!
While the HDMI input is selected:
- You can only use the Up/Down buttons to change the volume. You cannot use the volume control buttons on the wireless keyboard or the supplied
remote commander to change the volume.
- You can only use the OSD menu to change the brightness. You cannot use the function keys on the wireless keyboard to change the brightness.