Question

2

How to disable wifi power management (rtlwifi, rtl8192cu)

rated 0 times [ 2] [ 0] / answers: 1 / hits: 22622 / 3 Years ago, thu, june 17, 2021, 5:26:00

I have problems using my wifi connection under Ubuntu 13.04. As many others also reported, Thema realtek driver RTL8192CU causes connection problems.

Edit: This happens on two different machines (Ubuntu 13.04 and Ubuntu 12.10; Kernels 3.5, 3.8 & 3.9)

In my case it seems to disconnect every time the kernel tries to reduce the TX power:
wlan1: Limiting TX power to 27 (27 - 0) dBm as advertised by ...

Question: is it possible to prevent the kernel/driver from doing this?

dmesg snippet I found many times in the log:

[   69.721477] wlan1: authenticated

[   69.721887] rtl8192cu 2-2:1.0 wlan1: disabling HT/VHT due to WEP/TKIP use

[   69.725351] wlan1: associate with 00:18:84:23:50:4a (try 1/3)

[   69.744272] wlan1: RX AssocResp from 00:18:84:23:50:4a (capab=0x431 status=0 aid=2)

[   69.744348] wlan1: associated

[   69.744606] cfg80211: Calling CRDA for country: NA

[   69.772495] wlan1: Limiting TX power to 27 (27 - 0) dBm as advertised by 00:18:84:23:50:4a

[   76.075829] rtlwifi:rtl_watchdog_wq_callback():<0-0> AP off, try to reconnect now

[   76.075859] wlan1: Connection to AP 00:18:84:23:50:4a lost

nm-tool:
(At this time it was connected to my wifi (Becks) and browsing the internet was not possible.)

- Device: wlan1  [Becks] -------------------------------------------------------

  Type:              802.11 WiFi

  Driver:            rtl8192cu

  State:             connected

  Default:           yes

  HW Address:        EC:1A:59:10:4B:35



  Capabilities:

    Speed:           18 Mb/s



  Wireless Properties

    WEP Encryption:  yes

    WPA Encryption:  yes

    WPA2 Encryption: yes



  Wireless Access Points (* = current AP)

    EasyBox-FF0700:  Infra, 7C:4F:B5:FF:07:30, Freq 2422 MHz, Rate 54 Mb/s, Strength 94 WPA WPA2

    FRITZ!Box Fon WLAN 7170: Infra, 00:04:0E:89:40:21, Freq 2437 MHz, Rate 54 Mb/s, Strength 94 WPA

    belkin.3948:     Infra, 08:86:3B:E0:80:48, Freq 2412 MHz, Rate 54 Mb/s, Strength 92 WPA WPA2

    Delidovich's Home: Infra, 64:70:02:F6:FD:54, Freq 2452 MHz, Rate 54 Mb/s, Strength 92 WPA2

    *Becks:          Infra, 1C:C6:3C:35:FC:44, Freq 2417 MHz, Rate 54 Mb/s, Strength 76 WPA

    ASUS:            Infra, C8:60:00:94:9A:F6, Freq 2417 MHz, Rate 54 Mb/s, Strength 92 WPA



  IPv4 Settings:

    Address:         192.168.1.2

    Prefix:          24 (255.255.255.0)

    Gateway:         192.168.1.1



    DNS:             192.168.1.1

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

dresuitable

Add To Favorites

Follow

Total Points: 69

Total Questions: 116

Total Answers: 122

Location: Honduras

Member since Sun, Dec 26, 2021

2 Years ago

dresuitable questions

1 Bluetooth headphones cannot connect after update to Ubuntu 22.04

Wed, Sep 14, 22, 06:22, 2 Years ago

1 When does Ubuntu 22.04.2 come out?

Sat, May 15, 21, 04:38, 3 Years ago

1 Upgrading to 22.04 printer doesn't works in Color

Fri, Apr 14, 23, 09:53, 1 Year ago

1 UFW disabled/inactive on reboot

Tue, May 16, 23, 18:13, 1 Year ago

1 Backing up Linux using timeshift on an external hard drive

Sun, Apr 24, 22, 12:59, 2 Years ago

View All

answered 3 Years ago ticrew · Accepted Answer

When your computer tries to associate with the AP or access point that has the mac address BSSID 00:18:84:23:50:4a, this is where your problem begins because your BSSID for Becks is listed as 1C:C6:3C:35:FC:44. Also, 00:18:84:23:50:4a appears to be using WEP and your netowrk uses WPA authentication.

First, use a terminal to navigate to '/etc/NetworkManager/system-connections' with sudo. Gnome and the Ubuntu desktop use nautilus, Kde uses dolphin, and XFCE uses thunar but here I will show nautilus for the purpose of explaining this.

sudo -i nautilus '/etc/NetworkManager/system-connections'

Check to see if this folder contains any profiles saved for networks you do not use. You must have some configuration for the network your computer was trying to connect to. Deleting any unneeded profile will prevent future attempts to automatically connect to these networks. You should only have profiles here for the networks you want to keep.

Now to the internet. If your computer shows a connection to the router but you can't get a connection to the internet, you may be having some kind of a subsequent issue. The loss of connectivity may have resulted in the loss of an external DHCP lease and you may need to reset your modem.

Some routers use a single external DHCP lease from the modem for the main wired connection to the internet, generating an individual internal DHCP lease for each of your devices to use on the local network automatically. This allows devices to connect without having to obtain a new lease. Other times, each individual device on the network is assigned an external lease depending on the type of router and settings you use.