It seems you have wrong configuration. It was mentioned in this thread few times basic configuration - e.g. here
thnx sooo much for pointing me in right direction!!!
finally mld QCA9274 5/6GHz works not just on openwrt but also on debian/ubuntu
With the new commits in mt76 snapshot, which seem to include that patch, they do not correct the power as the ImmortalWrt patch did.
And what's worse, with the new commits, the ImmortalWrt patch has stopped working for me...
Sadly only 6Ghz band seems to be affected/improved with yesterdays mt76 tx drivers.
As long as the situation continues I’ll continue to utilize this patch:
https://github.com/openwrt/mt76/commit/8088940ffd047a6d282a95af829562e8038f5b2d.patch
Negative side effect is the increased heat dissipation of the ic’s involved (+10 to +20 C).
Some time before the mt76 update, I had with 6GHz a high upload speed, quite the same as the download speed, about 1.3Gbit/s (measured with iperf3). Now I have a way lower upload speed, about 800Mbit/s or so.
I am writing again to confirm that the ImmortalWrt patch does work after the latest commits in mt76. Without it, even despite the latest commits, my empty EEPROM BE14 still did not work.
But, again, its performance is far inferior to an MT6000. Next week I will receive RG178 pigtails and a plastic casing that I will have to drill holes in so that I can attach them to the antennas.
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I found out one of the culprits: my laptop antennas. When the lid is open, the antennas are inside the lid, the upload speed is way faster, sometimes even faster than download speed. But if I close the lid the upload speed goes way down.