[OpenWrt-Devel] How to fix the unknown in the IWINFO

[INYO L]

Hi, 
How can I read the TX power, Signal, and others
root at WirelessRouter:/etc# iwinfowlan0     ESSID: "wifi"          Access Point: 00:0F:02:70:3C:20          Mode: Master  Channel: 11 (2.462 GHz)          Tx-Power: 20 dBm  Link Quality: unknown/70          Signal: unknown  Noise: unknown          Bit Rate: unknown          Encryption: none          Type: nl80211  HW Mode(s): 802.11bgn          Hardware: unknown [Generic MAC80211]          TX power offset: unknown          Frequency offset: unknown          Supports VAPs: yes  PHY name: phy0
Thank you ! 
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