I connected a PS3 to an Asus 24" Monitor (Asus PB248Q) via HDMI. The monitor does not have internal speakers but has a jack for headphones.
If I connect a headset to the headphones jack I can hear the audio in the main PS3 menu (for example, the clicks that sound when you are selecting a user).
However, if I load Call of Duty, there is no sound coming out of the headset. The volume is fully turned up (both in the monitor's OSD and in PS3). Sound stops in the switch to CoD.
I notice that when Call of Duty loads, "HDMI" appears a couple times on the monitor so I assume that Call of Duty is doing some kind of HDMI initialization that ends up turning off sound.
By comparison, if the HDMI connection is made to a Sony Bravia TV, then is sound is fine for Call of Duty so it seems an issue specific to this monitor that does not have built-in speakers. I wonder if Call of Duty does some kind of handshake at load-time with the monitor and then turns off sound if it does not detect built-in speakers
Is there any setting I can configure to solve this issue?