The solution is to disable the DELL U2419H playback device (or other HDMI monitor) as follows: When the headphones were unplugged, playback switched back to the in-built Realtek speakers and sound was heard as normal. When the headphones were plugged in, playback switched automatically to the Dell monitor and consequently no sound was heard.
This is unhelpful because the monitor does not even have in-built speakers! When the HDMI monitor is plugged in, a DELL U2419H playback device was installed, probably by the monitor device driver. This answer should apply to any HDMI monitor. Known monitors that show this problem include: The laptop was plugged into an external monitor using HDMI. Have completed uninstalled and then re-installed Realtek audio drivers but without resolving the problem (headphones only work if they were plugged in when the PC is booted). "RtkAudUService"="\"C:\\Windows\\System32\\RtkAudUService64.exe\" -background"Ĭould this be a hardware problem? Is there anything to check in the BIOS? Update I tried this but this did not resolve the issue (headphones only work if Windows is booted with them plugged in).
If you startup Windows with the headphones unplugged, sound is never played through the headphones.Īccording to this article on Dell Support, the "solution" is to re-install the drivers. But now plug the headphones back in, and sound continues from the built-in speakers (and not the headphones). Unplug the headphone from the jack, and sound comes through the built-in speakers. Start up Windows with the headphones already plugged into the audio jack, and sound is correctly played through the headphones.
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