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

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  1. #1
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    Slow download speed using Centrino Wireless-N 1030 with Ubuntu 12.04

    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 windoze this OS rocks!!!


    Thanks

    SE

  2. #2
    Join Date
    Feb 2008
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    Ubuntu 12.04 Precise Pangolin

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

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

  3. #3
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    Re: Slow download speed using Centrino Wireless-N 1030 with Ubuntu 12.04

    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
    Attached Files Attached Files

  4. #4
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    Re: Slow download speed using Centrino Wireless-N 1030 with Ubuntu 12.04

    Please do:
    Code:
    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

  5. #5
    Join Date
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    Ubuntu 14.04 Trusty Tahr

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

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

    Would like you to open a terminal and do:
    Code:
    iwconfig | grep -A6 Bit
    Code:
    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.
    Last edited by DuckHook; April 18th, 2013 at 03:46 AM. Reason: Ninja'd by Wild Man
    Newb: How far must I jump to clear the ledge halfway down?
    Guru: It's bad to jump off cliffs. Let's look at better options.
    Newb: Stop harping about "best practices" and just tell me.


  6. #6
    Join Date
    Apr 2013
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    Re: Slow download speed using Centrino Wireless-N 1030 with Ubuntu 12.04

    @ 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.

  7. #7
    Join Date
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    Re: Slow download speed using Centrino Wireless-N 1030 with Ubuntu 12.04

    Quote Originally Posted by SEKarlos View Post
    ...Thanks for you assitance.
    Wild Man is way ahead...

    Quote Originally Posted by Wild Man View Post
    Please do:
    Code:
    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.
    Newb: How far must I jump to clear the ledge halfway down?
    Guru: It's bad to jump off cliffs. Let's look at better options.
    Newb: Stop harping about "best practices" and just tell me.


  8. #8
    Join Date
    Apr 2013
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    30

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

    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

  9. #9
    Join Date
    Feb 2008
    Location
    Texas
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    14,758
    Distro
    Ubuntu 12.04 Precise Pangolin

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

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

  10. #10
    Join Date
    Nov 2013
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    1

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

    Thanks to this thread. I followed WildMan's instructions on the first page and my connections are not dropping off anymore.

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