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