[Documentation] Discourage the usage of i8k tags

[Penaz91]

Greetings, this is my first time opening a discussion here.

I wanted to bring some attention to something that brought me a lot of issues: the i8k driver.

As presented in this thread on Freedesktop's GitLab (https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/2354) I have been having a lot of issues with audio for almost a year.

After a bit of investigating, I came to the conclusion that the audio issues were primarily caused by Conky, via the ${i8k_cpu_temp} command. From there I managed to manually reproduce the issue using the cat /proc/i8k command.

It seems that i8k uses System Management Mode, which suspends all operations, to gather BIOS data, which can be unacceptable to some end users, which could find themselves having issues when low-latency audio is involved (for instance in WebRTC calls) and not knowing why.

After changing ${i8k_cpu_temp} with an ${hwmon ...} command, the audio issues fixed themselves.

I was suggested to bring up the issue with Kernel, which I may soon do, but in the meantime I wanted to spread word of this issue that may hit other people like me.

Thank you very much for your attention.