![]() Suggestions that may enable proper jack detection without having to disable the device in the device manager: This also means that Windows drivers are equally error-prone. Unfortunately, most motherboards ship a unique or nearly-unique audio chipset, making the problem worse. ![]() On the Linux operating system, the Advanced Linux Sound Architecture (ALSA) driver developers have struggled with jack detection for years, having the labor-intensive task of making it work on tons of different sound cards. Jack detection is actually a software mechanism that is easily broken and very hardware-specific. ![]() It does this to prevent people from having to manually dig around in the control panel to listen to audio: it helps new users because the audio "just plays" out of whichever device the jack is plugged into. But if some other device has a connected jack and the default device doesn't, it will switch to the device that is connected. When jack detection is working correctly on Windows 7, Windows will automatically keep using a device marked as default as long as an audio output (speakers, headphones, etc) is plugged into the device. It is a fairly new technology based on sensing whether an electrical current is being drawn from the audio port (a very small amount of energy is needed to transmit the audio over a standard 3.5" cable). Jack detection is a mechanism which detects whether you have a sound device plugged into your sound jack. The reason this is happening is likely because the VIA sound driver has a bug that causes it not to perform "jack detection" correctly. This won't let you use your HDMI audio unless you enable it again, so you'll have to remember how to do that but the upside is that you won't even see the HDMI audio device in the playback/recording properties in the control panel. One way to go about this is to disable the HDMI audio device in the Device Manager.
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