Thread is old, but still relevant so will post an answer that works here after reviewing 10+ forum threads. Setup is a Lenovo T450 laptop w/ Intel 5500 integrated graphics on Win7 Pro, driving an LG 34" ultrawide monitor with HDMI. Audio playback devices included a "WsAudio" device and Realtek for the laptop, but no audio device for the monitor itself. Found comments on this that were flat out wrong, stating that there should not be an audio playback device with the monitor's name. Yes there should be, and the way to fix this issue is as follows: Step 1, go into Device Mgr, right click your Display Adapter and choose "Update Driver". This will update the Intel graphics driver to include HDMI support. Step 2, go back into your audio Playback Devices and you will see a new entry, mine is "LG Ultrawide, Intel(R) Display Audio". Bingo! Right-click to make that the default device, and you're done. Doesn't even require a reboot to make this work. Problem was easy to solve once I had the right information, which I found on a Dell user forum site.