Wireless slow in Arch2010.05/Ubuntu10.04 but fast in Windows 7

Hi all,
First time writer.
I've recently purchased a new laptop: Lenovo G550, Intel Wireless 5100AGN. On it I first installed Ubuntu 10.04 along side Windows 7 and immediately I noticed that while Windows on average upholds a download speed of 435 kb/s Ubuntu would only pull about 80kb/s through the wire. I tested on another laptop and sure enough the speed was 435 kb/s there as well. I installed Arch instead of Ubuntu and installed the this firmware:
core/iwlwifi-5000-ucode 8.24.2.12-2
    Intel wireless firmware for Intel's 5100BG, 5100ABG, 5100AGN, 5300AGN and 5350AGN wireless devices
But the speed was still slow. I tried enabling the testing-repo and updated everything incl. the kernel, but the speed remains painfully slow.
Its an open unencrypted network which I connect to using netcfg and this simple profile:
CONNECTION='wireless'
DESCRIPTION='Home'
INTERFACE='wlan0'
SECURITY='none'
ESSID='wireless'
IP='dhcp'
I've spent several days trying to sort out this issue and have no more tricks up my sleeve, help would be greatly appreciated.
Thanks,
Lau

I have also 5100agn, ipv6 disabled.
G mode - 30mbps - download speed
N mode   < 10 mbps download speed, 40mbps upload. I don't know how fix this N mode is very slow.
Under winXP - G same, N ~ 80mbps
You can try add
options iwlagn 11n_disable=0 11n_disable50=1
to modprobe.conf, it's ugly solution
Last edited by klama (2010-07-01 19:22:17)

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