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hanlin
November 14th, 2009, 07:23 PM
After the upgrade to Karmic, I've noticed that my wireless has been very slow. I couldn't figure out why, until today, when I saw that it was only connected at 54M. I have an intel 4965 wireless card with a 802.11n router. I know for a fact that it used to connect to the router at 130M (at least that's what the router software says). But now, it's only connected at 54M. The router shouldn't be an issue since other computers on the wireless network are connected at 130M. Any ideas why this laptop can't connect at full speeds?

djbon2112
November 29th, 2009, 02:37 AM
I seem to be having the same issue. My n card and n router only show a connection of 26 Mb/s!

jgrocha
December 10th, 2009, 11:59 PM
Same problem here, with Ubuntu Karmic 9.10.

My Wireless AP is "Wireless N" (SMC WBR14-3GN). Another laptop, with *another* operating system can archive the 130Mbps.

My Ubuntu laptop (ASUS G70), with "Intel(R) Wireless WiFi Link AGN driver for Linux, 1.3.27k", can only operate at 54Mbps.

The output of "iwlist wlan0 scan", only reports speeds up to 54Mbps. I think the problem is on the reported speed.
If the iwlist output doesn't show the 130Mbps speed, it is impossible to do something like:
sudo iwconfig wlan0 rate 130M

The output of iwconfig:

wlan0 IEEE 802.11abgn ESSID:"POR8033"
Mode:Managed Frequency:2.412 GHz Access Point: 00:12:CF:CC:D7:0E
Bit Rate=54 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=69/70 Signal level=-41 dBm Noise level=-94 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

More comments are welcome.