Arch Linux

Helloguysss

Member

Registered: 2025-03-18

Posts: 4

Mediatek MT7921U wifi card problem

The monitor mode of my Mediatek MT7921U chip wifi adapter does not work on new kernels.

It works fine in version 6.15. I don't know which version is the breaking point, but I think monitor mode doesn't work properly in newer kernel versions (such as linux-zen 6.19).

When monitor mode is enabled, SSIDs don't appear during scanning, and I'm not sure, but hidden networks appear. It only works normally in managed mode. TX-power was stuck at 3 dB anyway, but it doesn't work on any new kernels.

If you need a log or anything else, I'll provide it.

loqs

Member

Registered: 2014-03-06

Posts: 18,796

Re: Mediatek MT7921U wifi card problem

Have you tried the usual approach to debugging kernel regressions? Let me know if you need any help with the bisection.