Sony VGC-RT100Y - Manual (Page 77)

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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.
While the computer input is selected, you cannot change the HDMI input volume.