[Bug 545853] [NEW] [iwl3945] Wifi connects at 1Mbps

[TJ]

Public bug reported:

I'm currently testing a Lucid i386 install side-by-side with my primary
Karmic amd64 working environment with the ubuntu-desktop.

I've found when the wireless network (802.11g 54Mbps WPA2 PSK) connects
it stays at 1Mbps for some time before switching to 54Mbps. Previously
(Karmic, Jaunty, Hardy, etc.) the connection was immediately running at
54Mbps. The WAP is about 3 meters away and there are no other devices
within range operating on these frequencies (on a farm here).

Sometimes the link shifts speed to 54Mbps pretty quickly (couple of
minutes) but at others it stays at 1Mbps for 10 minutes or more. I want
to stress that this behaviour isn't seen with previous releases.

$ sudo iwlist wlan0 scan
wlan0     Scan completed :
          Cell 01 - Address: 00:16:B6:DA:68:15
                    Channel:13
                    Frequency:2.472 GHz (Channel 13)
                    Quality=63/70  Signal level=-47 dBm  
                    Encryption key:on
                    ESSID:"tjworld.net"
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                              24 Mb/s; 36 Mb/s; 54 Mb/s
                    Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
                    Mode:Master
                    Extra:tsf=0000000f93c31c45
                    Extra: Last beacon: 44ms ago
                    IE: Unknown: 000B746A776F726C642E6E6574
                    IE: Unknown: 010882848B9624B0486C
                    IE: Unknown: 03010D
                    IE: Unknown: 2A0100
                    IE: Unknown: 2F0100
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : TKIP
                        Pairwise Ciphers (2) : CCMP TKIP
                        Authentication Suites (1) : PSK
                    IE: Unknown: 32048C129860
                    IE: Unknown: DD09001018020010000000
                    IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00

$ iwconfig wlan0
wlan0     IEEE 802.11abg  ESSID:"tjworld.net"  
          Mode:Managed  Frequency:2.472 GHz  Access Point: 00:16:B6:DA:68:15   
          Bit Rate=1 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=66/70  Signal level=-44 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

$ lspci -nn | grep Wireless
06:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection [8086:4222] (rev 02)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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[iwl3945] Wifi connects at 1Mbps
https://bugs.launchpad.net/bugs/545853
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