Re: How to test MediaTek mt7921!

On Tue, 28 Jul 2026, Bjoern A. Zeeb wrote:

Hi,

various updates:

(1)

> 	https://reviews.freebsd.org/D58479 mt76: mt7921: update man page

That review is in main now and will be MFCed to stable/15 approx end of the week.


(2)

If you have trouble updating this in single user mode (mount -uw /, vi /etc/rc.conf, ..)

> * If anything goes wrong boot into single user and add
>  devmatch_blacklist="${devmatch_blacklist} if_mt7921"
>  to rc.conf, which will prevent the driver from being automatically loaded.

you can also type this into the loader prompt:

 	devmatch_blocklist="if_mt7921"

which should help for that boot so you can add rc.conf from multi user.


(3)

There is a bug in generic LinuxKPI which was discovered by one of you:

 	https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297121

This was leading to timeouts and mt7921 not working.  A temporary workaround
would be to set the following in your loader.conf to avoid bouncing:

 	compat.linuxkpi.skb.mem_limit=1


(4)

I am aware of one case where the chipset would not work but only run into
timeouts upon loading firmware.  I've head similar problems last year, which
are documented at:
https://github.com/FreeBSDFoundation/proj-laptop/issues/66#issuecomment-3418857232
and the following comments down to end of November.  I had the same issue
on Linux on these Laptops.
You would see messages similar to
 	mt7921e 0000:02:00.0: Message 000021ed (seq 1) timeout
along with others like:
 	mt7921e 0000:02:00.0: Timeout for driver own
or:
 	.. failed to release patch semaphore

I am trying to see what can be done about this, especially given laptops ship
with the card included, so should be a good combination of HW.


(5)

Lastly!  We also had a success story of someone able to associate and having packets.



That's it for now.  Please keep us updated if you are trying it out!

/bz

-- 
Bjoern A. Zeeb                                                     r15:7