New comment by rubin55 on void-packages repository

https://github.com/void-linux/void-packages/issues/34554#issuecomment-999481844

Comment:
Ok fair enough. For posterity, I ran into an issue when both Bluetooth and Wi-Fi were enabled and thought it was a recent regression in the Linux kernel, hence the wish to have it available in older kernel versions.

Turns out this issue exists on older kernel versions equally. I wrote about the issue here: https://www.reddit.com/r/thinkpad/comments/rkvggg/thinkpad_p14s_gen2_amd_linux_515_mediatek_7961/

TL;DR; if you come here and think you have an issue with `mt7921e` and/or with `btusb`, check your wireless band with `iwconfig wlan0`. If its in the ~2.4Ghz range, you will find that it is very likely conflicting with your bluetooth stack which is also operating within the same range. Quick workaround: make sure you have a Wi-Fi router that can do ~5Ghz and connect your Wi-Fi on the ~5Ghz band, which avoids conflict with your bluetooth stack.

Other drivers (i.e., `iwl2200`) have a `bt_coex` option that seems to avoid this issue. `mt7921e` does not have this option (yet?). I emailed Sean Wang, who is one of the developers at MediaTek who works on `mt7921e` to share my experiences.