This is my first time tracking down a kernel bug, so it's taking me a
little while as I learn the bisection & kernel compilation procedure.
As an initial step, I have isolated the problem to something Ubuntu-specific.
I have now tried running several mainline 5.4 kernels including, e.g.,
iw dev info *reports* the same default txpower (20.00 dBm) for all
kernels. It is only the actual received signal (at the access point)
that varies. I paste the output of `iw dev wlo1 info` below for 5.4 and
5.8; 5.3 is the almost the same except it lacks the multicast TXQ lines:
Interface wlo1
Public bug reported:
This wireless adapter worked well under 18.04.4 (kernel 5.3) but has
poor range after installing 20.04 (kernel 5.4). This is testing a
2.4GHz connection. While the received signal strength appears to be the
same with either kernel, the transmitted signal is much weaker
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