Problem changing the signal power wi-fi

[olimpiumarius]

Hello,

Router Linksys WRT1900ACS v2 Kernel Version 4.19.66 SNAPSHOT r10815-fd4804ce33 / LuCI Master (git-19.228.36069-f3bcb91)

driver name: mwlwifi chip type: 88W8864 hw version: 7 driver version: 10.3.8.0-20181210 firmware version: 0x0702091a power table loaded from dts: no firmware region code: 0x30 mac address 2g: enable 5g: disable antenna: 4 4 irq number: 49 ap macid support: 0000ffff sta macid support: 00010000 macid used: 00000001 radio: enable iobase0: 58325fdd iobase1: 2f18e395 tx limit: 768 rx limit: 64 qe trigger number: 5607907

If I want to change the signal power transmission from the Luci web interface, it has no effect, the value remains still set on Auto. The problem with channel display also persists!

I must admit that i saw an improvement on the 2Ghz and 5 Ghz wifi side following the fixes on the wifi updates side, and a fix for the mwl...

[kubrickfr]

1) Unfortunately this driver seems to be dead 2) No #332, no #291 and no #315. An many more times no.

[borkra]

Max power values are fixed at the certification time, any change to them even though it is technically a software change, require re-certification of the product, which is expensive and time consuming. I doubt Linksys will go for it on a legacy product. But you can ask Linksys support if they are interested.

[tiagogaspar8]

This power limit is related to the channel number, non DFS channels have low power. If you issue the command iw phy0 info (I believe it's this one, but it won't vary much from that) you can see each channel and it's power limit.

[borkra]

In addition power limits depend on a country one is in.

power limits often reduced by manufacturers when they have hardware design issues most common ones excessive signal bleed into nearby channels and excessive antenna gain.

[olimpiumarius]

root@swrt:~# iw phy0 info Wiphy phy0 max # scan SSIDs: 4 max scan IEs length: 2247 bytes max # sched scan SSIDs: 0 max # match sets: 0 max # scan plans: 1 max scan plan interval: -1 max scan plan iterations: 0 Retry short limit: 7 Retry long limit: 4 Coverage class: 0 (up to 0m) Device supports AP-side u-APSD. Device supports T-DLS. Available Antennas: TX 0 RX 0 Supported interface modes:

• managed
• AP
• AP/VLAN
• monitor
• mesh point Band 2: Capabilities: 0x106f RX LDPC HT20/HT40 SM Power Save disabled RX HT20 SGI RX HT40 SGI No RX STBC Max AMSDU length: 3839 bytes DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: 4 usec (0x05) HT TX/RX MCS rate indexes supported: 0-23, 32 VHT Capabilities (0x33837930): Max MPDU length: 3895 Supported Channel Width: neither 160 nor 80+80 RX LDPC short GI (80 MHz) SU Beamformer SU Beamformee RX antenna pattern consistency TX antenna pattern consistency VHT RX MCS set: 1 streams: MCS 0-9 2 streams: MCS 0-9 3 streams: MCS 0-9 4 streams: not supported 5 streams: not supported 6 streams: not supported 7 streams: not supported 8 streams: not supported VHT RX highest supported: 0 Mbps VHT TX MCS set: 1 streams: MCS 0-9 2 streams: MCS 0-9 3 streams: MCS 0-9 4 streams: not supported 5 streams: not supported 6 streams: not supported 7 streams: not supported 8 streams: not supported VHT TX highest supported: 0 Mbps Frequencies:
  • 5180 MHz [36] (23.0 dBm)
  • 5200 MHz [40] (23.0 dBm)
  • 5220 MHz [44] (23.0 dBm)
  • 5240 MHz [48] (23.0 dBm)
  • 5260 MHz [52] (20.0 dBm) (radar detection)
  • 5280 MHz [56] (20.0 dBm) (radar detection)
  • 5300 MHz [60] (20.0 dBm) (radar detection)
  • 5320 MHz [64] (20.0 dBm) (radar detection)
  • 5500 MHz [100] (27.0 dBm) (radar detection)
  • 5520 MHz [104] (27.0 dBm) (radar detection)
  • 5540 MHz [108] (27.0 dBm) (radar detection)
  • 5560 MHz [112] (27.0 dBm) (radar detection)
  • 5580 MHz [116] (27.0 dBm) (radar detection)
  • 5600 MHz [120] (27.0 dBm) (radar detection)
  • 5620 MHz [124] (27.0 dBm) (radar detection)
  • 5640 MHz [128] (27.0 dBm) (radar detection)
  • 5660 MHz [132] (27.0 dBm) (radar detection)
  • 5680 MHz [136] (27.0 dBm) (radar detection)
  • 5700 MHz [140] (27.0 dBm) (radar detection)
  • 5720 MHz [144] (disabled)
  • 5745 MHz [149] (13.0 dBm)
  • 5765 MHz [153] (13.0 dBm)
  • 5785 MHz [157] (13.0 dBm)
  • 5805 MHz [161] (13.0 dBm) valid interface combinations:

• { AP } <= 16, #{ mesh point } <= 1, #{ managed } <= 1,

             total <= 16, #channels <= 1, radar detect widths: { 20 MHz (n                                  o HT), 20 MHz, 40 MHz, 80 MHz, 160 MHz }
  
  HT Capability overrides:

• MCS: ff ff ff ff ff ff ff ff ff ff
• maximum A-MSDU length
• supported channel width
• short GI for 40 MHz
• max A-MPDU length exponent
• min MPDU start spacing Supported extended features:
  • [ CONTROL_PORT_OVER_NL80211 ]: control port over nl80211 root@swrt:~#

[borkra]

Do not see the problem here, max allowed power (per router certification) is matching current power

[olimpiumarius]

It seems that this problem no longer persists in the latest drive versions