After manually updating the OS (in the System tab of OS webui), and choosing the RT kernel in "Linux Kernel" of "SnakeOil" tab and saved, the RT kernel is not listed in the boot up grub menu and the previous using kernel is used instead.
![[Image: image.png]](https://i.ibb.co/RTkcG50/image.png)
![[Image: image.png]](https://i.ibb.co/JK1zkSb/image.png)
After using "update-grub2", "grub-install" and etc (I'm sorry that I was a bit confused here and need some senior user to clarify for me), then after reboot it works. The max latency is roughly 10 times less than lowlatency kernel, the rest are similar.
![[Image: image.png]](https://i.ibb.co/vxdFkZ2/image.png)
![[Image: image.png]](https://i.ibb.co/nCX4Gc6/image.png)
And for the sound, please allow me some more time.