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Possible Duplicate:
Slow wireless with an Intel 4965

We run Ubuntu 12.04, 32bit, with the current kernel 3.2.27-generic on an MSI EX700.

I've already added the 11n_disable=1 tweek, without whcih, wireless has been unusable.

Now, it works OK, but speedtest shows:

Windows XP - down 11.68mbps, up 2.07mbps

Ubuntu 12.04 - down 2.06mbps up 2.0mbps

We've disabled ipv6, tried static and dinamic IPs, tried both swcrypto=0 and swcrypto=1 options, none of whcih made any difference.

The problem may be the symptom of high packet loss. For example, here's the output of iwconfig after booting and testing the speeds:

wlan0     IEEE 802.11abg  ESSID:"amu"  
      Mode:Managed  Frequency:2.462 GHz  Access Point: 00:78:9E:FA:32:C8   
      Bit Rate=54 Mb/s   Tx-Power=15 dBm   
      Retry  long limit:7   RTS thr:off   Fragment thr:off
      Encryption key:off
      Power Management:off
      Link Quality=58/70  Signal level=-52 dBm  
      Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
      Tx excessive retries:11  Invalid misc:3627   Missed beacon:0

I've posted a help request before with lots of technical info and outputs.

Community
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mikewhatever
  • 33,013

3 Answers3

2

(answer in progress)

The iwl4965/iwlegacy driver has had a number of regressions in the past, but they've usually been fixed.

The high invalid misc number may be related to your low throughput.

Please try/test/answer a couple of things, and ask me for a howto when needed:

  1. Do you experience this problem with the Ubuntu 12.04 Desktop Live CD (which runs kernel 3.2.0-23, IIRC)?
  2. Can you try using wicd instead of NetworkManager?
  3. Can you compile and try the latest iwl4965 driver from the compat-wireless tree?
  4. What is the manufacturer/model number of your router?
  5. Does your laptop have bluetooth?
ish
  • 141,990
-1

There seems to be no fix. Replace it with the same form factor if you can find it.

Intel Pro 4965AGN is old (about 2007 or so), and apparently, it had this problem on Linux for many years. It is unlikely that Intel will ever fix the driver for such an old piece of hardware, that it hasn't been able to fix thus far. I'd imagine this task is of a very low priority on the maintainers' to do list,if it's on the list at all. It is unfortunate, because Intel branded wireless cards used to have good Linux support, and were known to work out of the box.

mikewhatever
  • 33,013
-1

rfkill is a small tool to query the state of the rfkill switches, buttons and subsystem interfaces.

Maybe try:

rfkill unblock all

I assume based on your question that you tried different modules versions and configurations if not please do it :)

I hate to say that, blacklist iwl4965 module and try using ndiswrapper.

Eliah Kagan
  • 119,640
pl1nk
  • 6,667