Wireless 3945ABG very slow?

[mac-duff]

Hi there,
I have the sensation that my wifi connection is quite slow because it also doesnt matters to which network I am connected to.
I am running Ubuntu 12.04 and have a Intel Wifi Card:
0c:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection (rev 02)
Subsystem: Intel Corporation Device 1021
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at f9fff000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
Kernel driver in use: iwl3945
Kernel modules: iwl3945


I was looking over the internet if there is something about a driver change, but didnt got a good result

I hope someone can assist me a bit?
Thx
Stephan

[Sonic Reducer]

hi, i'm posting here because i have the same problem. wireless used to be pretty decent, but i installed xubuntu 12.04 and now i can barely break 50kb/s on torrents TOTAL

i think the problem is the switch from ipw3945 to iwl3945, which i've never heard good things about. i cant for the life of me figure out how to install (i dont think it's in the repos anymore)

i've also had a lot of problems with encryption on 12.04. ive read some stuff about encryption being handled by hardware vs software, and how one is good and the other bad, but i dont know.

[Bartender]

Take a look at my post from a few months ago. See if that helps.

I should mention that if the workaround in that thread works, you may have a problem that only comes up with some routers. With our old Linksys WRT54G I had to use this workaround. We got a new Netgear router a few weeks ago. I then removed the workaround and the wireless connectivity is fine.

[Sonic Reducer]

Take a look at my post from a few months ago. See if that helps.

I should mention that if the workaround in that thread works, you may have a problem that only comes up with some routers. With our old Linksys WRT54G I had to use this workaround. We got a new Netgear router a few weeks ago. I then removed the workaround and the wireless connectivity is fine.

i can do better than disabling wireless n, i can have a laptop made before it existed! lol the ipw3945 is wireless a/b/g.

im trying to find any option before i try and install ipw3945 from source.

[mac-duff]

Hi Bartender,
I tried your way and it works. Before when I copied something to my NAS I had 300KB and now 2mbit.

Thanks a lot

[Sonic Reducer]

so i tried it... even though i have a 3945abg...

gksu leafpad /etc/modprobe.d/options.conf

i didn't have an options.conf file already so an empty file was opened. i pasted options iwl4965 11n_disable=1 into the first line and saved, then rebooted.

it's not as fast as it used to be, but definitely better.

do you guys have stability issues for a couple minutes after starting? i disconnected and reconnected a couple times. wicd is also not using the static ip i set for connecting to my wifi, but when i dis/reconnect it will use them. that might be wicd's fault not the 3945's though

[mconley3]

Just thought I would add to this. I have a Gateway with a PRO/Wireless 3945ABG [Golan] Network Connection. I haven't noticed slowness per say, but the connection does "break" when I'm download large files from the internet or lan. I noticed a problem when I upgraded to 11.04, I was hoping 12.04 would fix the problem but it didn't. I put break in quotes because network manager still shows I'm connected, but I can't ping the router. I have to turn off the wifi adapter with a switch and turn it back on again to get the connection to start working. I'm using an SMC Barricade N Wireless Router. I have tried various different things, including disabling N, with no success. I did open a question on launchpad here.
https://answers.launchpad.net/ubuntu...uestion/189625
Seems everyone has a slightly different problem with the driver for this Wifi card. Maybe it depends on the router.

Normal browsing of the internet seems to be fine, when I need to do updates, I hard wire to the network.

There is some hope. I found the following.
https://bugzilla.redhat.com/show_bug.cgi?id=805285
http://bugzilla.intellinuxwireless.o...ug.cgi?id=2359
https://bugzilla.novell.com/show_bug.cgi?id=768567
https://bugs.launchpad.net/ubuntu/+s...x/+bug/1009878

Not really sure how to tell when or if the patch from Intel will get rolled into 12.04/12.10

[wildmanne39]

Thread moved to Networking & Wireless.