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
ifindex 2
wdev 0x1
addr 74:40:bb:2e:b8:c1
ssid nullfarm
type managed
wiphy 0
channel 6 (2437 MHz), width: 40 MHz, center1: 2447 MHz
txpower 20.00 dBm
multicast TXQ:
qsz-byt qsz-pkt flows drops marks overlmt hashcol
tx-bytes tx-packets
0 0 0 0 0 0 0 0
0
On 5.8, `set txpower auto` sets it to be 30.00 dBm (as reported by
rerunning `iw dev wlo1 info`). However, this does not noticeably change
the received signal strength (as there is variation in received signal,
a small difference in the mean would be hard to detect). I also tried
`set txpower 100` to 1.00 dBm; this also does not appear to change the
received signal strength. So I suspect the txpower setting must not be
getting through to the hardware.
On 5.4, `set txpower auto` sets it to be 20.00 dBm (i.e., no change).
Attempting to match 5.8 auto by `set txpower 3000` actually sets it to
be 20.00. `set txpower 100` works but none of these changes to txpower
affect the received signal strength.
On 5.3, `set txpower auto` sets it to be 30.00 dBm (same as 5.8). `set
txpower 100` also works but again, none of these changes affect the
received signal strength.
I am conducting these tests ~5m away from the access point, although
through walls/floor. The 5.3 and 5.8 received signal strength is
generally between -61 and -65 dBm while on 5.4 it is generally between
-78 and -80 dBm.
A cold boot into 5.4 does not change the behavior.
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https://bugs.launchpad.net/bugs/1885663
Title:
RTL8822BE [10ec:b822] Subsystem [103c:831b] wifi regression
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