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So my desktop computer comes with a built-in wireless adapter part of the motherboard and now I installed an Alpha wi-fi adapter to play around with.

The built in wifi on wlan0 says it's running at 200 dBm power! Which I know it's impossible otherwise I may be able to get the wireless signals of the whole country ;-)

and the other one maxes out at 20 dBm, Ive tried to do the following to increase the alpha power to 30 doing the following:

sudo ifconfig wlan1 down sudo iw reg set BO sudo iwconfig wlan1 txpower 30 sudo ifconfig wlan1 up

but I can't bring it higher than 20 even though theoretically I know it can go up to 30.

My two questions are,

Does anyone know why wlan0 shows at 200 dBm? (Which is clearly wrong!)

And why can't I bring wlan1 (the Alpha device) higher than 20?

Thank you!

wlan0 IEEE 802.11abg ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=200 dBm
Retry short limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off

lo no wireless extensions.

wlan1 IEEE 802.11bgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off

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The 200dBm thing is probably a 23dBm card with a buggy driver accidentally reporting mW instead of dBm.

For the card you think should be capable of 30dBm but seems limited to 20dBm, it could be regional regulatory restrictions it's seeing from beacons of nearby APs, or it could be a default value it uses while unassociated. It might jump to its full potential when associated to an AP that says 30dBm operation is legal in its beacon information elements. It would be helpful if you posed the exact model of the card.

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