Slow download speed using Centrino Wireless-N 1030 with Ubuntu 12.04

[SEKarlos]

Hi,

Hopefully someone can help an absolute beginner!

I'm not able to receive a download speed of more than 56 KB/s using Ubuntu Release 12.04 (precise) 32-bit, Kernel Linux 3.2.0-41-generic-pae with the Intel Centrino Wireless-N 1030 interface on a Dell XPS L502X laptop. The broadband tariff is unlimited and I'm experiencing this slow speed with the laptop connected to the mains so power management shouldn't be throttling the speed.

When I ran the diagnostic for my router it tells me it's downloading up to 511 KB/s.

If I'm running Windows 8 free trail version (both OS are running on same laptop) I'm able to receive roughly 511 KB/s and if I tether the laptop to my mobile i can download over 511 KB/s, using wi fi in each instance.

Would really appreciate knowing how to solve the slow download speed issue cause compared to ******* this OS rocks!!!


Thanks

SE

[wildmanne39]

Hi, copy and paste this command in the terminal (ctrl+alt+t) please:

wget -N -t 5 -T 10 http://dl.dropbox.com/u/57264241/wireless_script && chmod +x wireless_script && ./wireless_script

It will download a script and create a text file in your home folder with wireless information so we can see the condition of your wireless at this time and the Mac address, WPA key and WEP key are removed for your security, then reply back, click on the paper clip and attach the netinfo.txt file.

If you do not have ethernet either then follow the directions at this link for running the script without internet.
http://ubuntuforums.org/showpost.php?p=12350385
Thanks

[DuckHook]

Hi SEKarlos and welcome to the forum community and to Ubuntu/Linux.

Would like you to open a terminal and do:

iwconfig | grep -A6 Bit

lsmod | grep iwlwifi

...that's the letter 'l' in iwlwifi and not the number "1'. Also, case matters in Linux. Probably best to copy and paste my code into your terminal to forestall typos. Please post output back to this thread. We are trying to see quality of your connection and if you are using the iwlwifi driver, which has been known to cause some problems. If this is your driver, you may have a problem similar to this one, for which we could try this solution. But before jumping the gun, just post back the output of above command first. Do NOT, repeat, do NOT implement the linked solutions until we ascertain your driver and do further tests. You could render Ubuntu WIFI completely inoperative with the wrong solution so must tread carefully.

Beaten to the punch by Wild Man again!

@OP

Always follow Wild Man's instructions first. True guru, that Wild Man.

[SEKarlos]

Hi,

Thanks for trying to resolve, really appreciate it.

Please find the file attached (had to compress it as was told to large to email).

Rgds

[SEKarlos]

@ Duck Hook

Please see below the outputs from the commands you asked me to enter

ubuntu@ubuntu-Dell-System-XPS-L502X:~$ iwconfig | grep -A6 Bit
lo no wireless extensions.


wwan0 no wireless extensions.


eth0 no wireless extensions.


Bit Rate=54 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thrff Fragment thrff
Power Managementff
Link Quality=70/70 Signal level=-40 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:913 Missed beacon:0


ubuntu@ubuntu-Dell-System-XPS-L502X:~$ lsmod | grep iwlwifi
iwlwifi 366509 0
mac80211 436493 1 iwlwifi
cfg80211 178877 2 iwlwifi,mac80211



Thanks for you assitance.

[wildmanne39]

Please do:

echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
sudo modprobe -rfv iwlwifi
sudo modprobe -v iwlwifi

Also linux drivers work better if you can change your router encryption to wpa2 only if you have that option.

Try channel 1 or 11 after you run the above commands.

You have several networks in your area this creates a nightmare for network manger.
Thanks

[DuckHook]

...Thanks for you assitance.

Wild Man is way ahead...

Please do:

echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
sudo modprobe -rfv iwlwifi
sudo modprobe -v iwlwifi

Also linux drivers work better if you can change your router encryption to wpa2 only if you have that option.

Try channel 1 or 11 after you run the above commands.

You have several networks in your area this creates a nightmare for network manger.
Thanks

...See what I mean?

After implementing his solution, be sure to tell us how it goes.

[SEKarlos]

Hi Wild Man,

Thanks for sending the help.

I assumed you intended for me to copy and paste all the code in one go? I did and got the following response: options iwlwifi 11n_disable=1

However, my wifi then disconnected and will not reconnect, I can no longer switch wi fi on (i'm now connected via ethernet cable)!

Did i execute the code incorrectly?


Rgds

[wildmanne39]

You need to copy and paste the code one line at a time.
Thanks

[SEKarlos]

Hi Wild Man,

I entered each line one at a time (please see below for details of terminal entries and outputs), but she's still only giving me 56 KB/s unfortunately. For the router I changed to channel 11 and selected 'WPA2-PSK(Wi-Fi Protected Access 2 with Pre-Shared Key)'.

I did notice though that when connected by ethernet the max download speed is also 56 KB/s, does this suggest it is an issue other than wi fi ?











ubuntu@ubuntu-Dell-System-XPS-L502X:~$ echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
[sudo] password for ubuntu:
options iwlwifi 11n_disable=1
ubuntu@ubuntu-Dell-System-XPS-L502X:~$ sudo modprobe -rfv iwlwifi
rmmod /lib/modules/3.2.0-41-generic-pae/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko
rmmod /lib/modules/3.2.0-41-generic-pae/kernel/net/mac80211/mac80211.ko
rmmod /lib/modules/3.2.0-41-generic-pae/kernel/net/wireless/cfg80211.ko
ubuntu@ubuntu-Dell-System-XPS-L502X:~$ sudo modprobe -v iwlwifi
insmod /lib/modules/3.2.0-41-generic-pae/kernel/net/wireless/cfg80211.ko
insmod /lib/modules/3.2.0-41-generic-pae/kernel/net/mac80211/mac80211.ko
insmod /lib/modules/3.2.0-41-generic-pae/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko 11n_disable=1 11n_disable=1
ubuntu@ubuntu-Dell-System-XPS-L502X:~$