Not Your Another Common Network Problem
The head-scratcher is this:
My atheros-based laptop cannot connect to wireless networks running on low channels.
The lower the channel, the worse the connection. At channel 1, I cannot even ping local routers. It starts at 400ms and after few retries reaches 50 000ms, then times out indefinitely.
On channel 11 everything works flawlessly, on 9 and 10 - moderately good.
Before you jump to obvious conclusions, let me rule out some obvious conclusions:
1. Hardware fault:
- everything works fine under Windows, live CD of Ubuntu 9.10 and 10.04, BackTrack liveCD
2. Settings problem:
- it first occurred on ubuntu 9.04 (few months after installation) and after upgrading to 10.04 problem continues
- it also occurs on freshly installed Arch which has NO settings nor files imported from old linux
- occures on gnome (Ubuntu) and pure xfce4 (arch)
3. Location, router, overloaded band:
- it occurs in various countries, various cities, various networks
- it occurs even if all wifis are running on 11 and only one on channel 1
- tried ath5x and madwifi
- it keeps happening with every kernel since Oct 2009. Before, I did not test it.
- it works on kernel supplied on livecds of Ubuntu 9.10 and 10.04
- it is happening at least since 2.6.31 onwards (2.6.34 included)
6. Network Manager and WICD:
- happens using either of them
So, give it your best shot. I have been trying to find an answer to it on various forums since October last year and yet came up with a solution.