Changing the Tx-Power does not change the power, I check the power using a smartphone.
Software: OpenWrt 18.06-SNAPSHOT r7405-06a20afb34 / LuCI openwrt-18.06 branch (git-18.329.26825-5e87083)
or
OpenWrt 17.01
It's not possible to use a cell phone to do what you describe. Did you confirm the power change on the router's command line (e.g. using iw)?
Why can not I check the signal power with a smartphone?
I changed TX-power from 20db to 4db and power signal has not changed.
iwinfo:
wlan1 ESSID: ""
Access Point: 62:38:E0:DA:41:F7
Mode: Master Channel: 13 (2.472 GHz)
Tx-Power: 4 dBm Link Quality: 51/70
Signal: -59 dBm Noise: -66 dBm
Bit Rate: 86.6 MBit/s
Encryption: WPA2 PSK (CCMP)
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: 11AB:2A55 11AB:0000 [Marvell 88W8864]
TX power offset: none
Frequency offset: none
Supports VAPs: yes PHY name: phy1
If v2 flavour power table is fixed
cat /sys/kernel/debug/ieee80211/phy0/mwlwifi/info | grep power
cat /sys/kernel/debug/ieee80211/phy0/mwlwifi/info | grep power
power table loaded from dts: no
I guess, it depends on what you actually changed the power to.
Depending... you need this to check a radio's power:
Or RF power meter.
- Please explain why the system says 4 dBm - as you wish?
The smartphone accurately represents the change in signal strength.
I do not know what to explain here.
- It says 4 dBm. That's what you wish, correct?
- Have you reooted?
I'm not sure what you mean here. I'm hoping you don't mean you believe your phone is actually a RF power meter.
I would experiment by walking a distance with the device or laptop at 20 dBm, then changing it to 4 dBm. You may have to do this via command line, so you can definitely observe the disconnect without it revering because the distance is too far for signal at 4dBm.
I set 1,2,3 ... 19, 20 db. Power signal has not changed.
Of course, I did reboot.
Of course, phone is not RF power meter, but a change from 20db to 1db would certainly have noticed
Are you guessing...using web GUI??
Please post /etc/config/wireless
It’s a known fact that the mwlwifi driver doesn’t allow power changing. The command is ignored by the driver.
** this may only apply to the newer devices which load from internal EEPROM rather than DTS power tables. The device mentioned in this thread fits that description anyway.
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the file is the same as in the GUI
something can be done about it?
Your complaint/query falls to Linksys/Marvell. The short answer is “no”, the long answer is that it MIGHT be possible if you modify the driver.
BUT, the firmware is closed source, so you’d be doing a bit of guesswork.