Franczen Attila <francz...@gmail.com>wrote on 20/07/2009 03:21:17 PM:
> Please lend me a hand here. I have made a clean install of Ubuntu
> Jaunty a few months ago, and suddenly the wireless stopped working.
> Even without any WPA or other encryption / authentication, my laptop
> lacks to connect to my router. My wireless is Atheros 5005G, which is
> identified as AR2413 802.11bg NIC by "lshw -C network", and my laptop
> is a Toshiba Amilo Pa 1510. The router is fine, because other boxes
> can connect to it. I recently made a fresh install of Karmik Koala,
> which is already with the 2.6.31 kernel version, hoping that it was a
> kernel bug, and it got fixed. No luck in that direction. I have
> attached some outputs. I hope those are useful. I have also noticed,
> that if I put my laptop right next to the router, then I get DHCP. If
> I move further away, the connection is lost.
It sounds like a signal strength issue - if everything works when you are
right next to the router, then the software side is (probably) not to
blame. Looking at your iwconfig output, you aren't running at maximum power
for the interface. Here's my dormant ath0 (you have wlan0) interface.
[r...@nexus6 ~]# iwconfig ath0
ath0 IEEE 802.11abg ESSID:""
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Tx-Power=27 dBm
Retry min limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
A couple of things from my travels in wireless configuration. First, see
what the card can see when scanning:
iwlist wlan0 scan
This should show a list of access points. See whether you can always see
the router as you move the laptop further away. Particularly pay attention
to the Quality line - I seem to have no trouble around Quality 30/70 but
higher is better.
[r...@nexus6 ~]# iwlist ath0 scan
ath0 Scan completed :
Cell 01 - Address: 00:MM:NN:OO:PP:QQ
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=37/70 Signal level=-73 dBm
Encryption key:on
ESSID:""
Make sure that your rate and channel control is automatic and you can also
override the txpower using iwconfig if it is
iwconfig wlan0 rate auto channel auto
iwconfig wlan0 txpower 27
or
iwconfig wlan0 auto
You can lock down the rate and channel controls if you know specific
settings for these (based on experience/ router configuration).
Cheers,
Toby Haynes_______________________________________________
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