[gokhan]

> When you plug headphones in, the sound outputs through the headphones.

That's how Windows 10 behaves for me. I already knew it, but just tried again for you playing a movie using VLC and plugging in my headphones. Works like a charm.

[vesrah]

Windows frequently gets confused by my USB DAC and tries to send sound to my HDMI connected monitor.

[hobos_delight]

I have the same experience - on-board sound, usb dac (primary) and hdmi audio interface on an nvidia card.

Every so often it will "forget" that it should be using the usb dac and revert to the hdmi audio output.

[fhood]

No pop-up menus?

[gokhan]

No nothing. Also, forgot to mention another test, went to hibernate while the sound playing through laptop's speakers, plugged in headphones while the machine is off, started the machine. Sound was coming through the headphones after the boot. I'm on a t450s.

[jyrkesh]

I think that's a vendor implementation. I used a Lenovo for a long time, worked perfectly without a pop-up. Just got a Dell XPS 15, it pops up a prompt when I plug stuff in (but it also allows me to set a default behavior, so.... ‍️

[quantummkv]

No, never experienced them on my machine while switching between headphones and external speakers. Maybe you have some misconfigured driver?