Please update the latest audio driver from our website to fix this problem.
Here are the download links for Hi-Fi models.
For Hi-Fi Z77X
https://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=608&tab=3
For Hi-Fi H77S
https://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=609&tab=3
