Very slow connection on an Intel(R) WiFi Link 5100 AGN

Question

So my wi-fi card is a Intel 5100 AGN and so far doesnt works. if anyone managed to make it work give me any hint. Ubuntu user :) tried disabling ipv6 - no result

Answer 1

There is a problem with kernel 3.0.0.x and Intel wifi under 802.11n.

We are all waiting for the fix in the kernel.

There is a workaround:

1. Create a file /etc/modprobe.d/intel_11n_disable.conf containing :

   options iwlagn 11n_disable=1
   

2. sudo update-initramfs -u

3. reboot or sudo modprobe -r iwlagn && sudo modprobe iwlagn

Ref:

• https://bugs.launchpad.net/ubuntu/+source/linux/+bug/871254

Answer 2

Did disable via options iwlagn 11n_disable=1

After a kernel update to 3.0.0.13-generic i tried to set

options iwlagn 11n_disable=0

This did enable N speed without the reappearance of the lost and slow connections or dead dd-wrt access points.

Answer 3

Update: Since I got downvoted, I changed the answer a bit:

1. Backup the .deb files, just in case:

   sudo apt-get download network-manager network-manager-gnome
   

This will download two .deb package files in your home directory

1. Purge network manager and install wicd

   sudo apt-get purge network-manager network-manager-gnome
   sudo apt-get install wicd wicd-gtk
   

2. Reboot. Try to connect using wicd.

If anything goes wrong, just purge wicd and reinstall network manager:

sudo apt-get purge wicd wicd-gtk
sudo dpkg -i network-manager*.deb

Answer 4

This :

There is a problem with kernel 3.0.0.x and Intel wifi under 802.11n. We are all waiting for the fix in the kernel. There is a workaround:

1. Create a file /etc/modprobe.d/intel_11n_disable.conf containing :

   options iwlagn 11n_disable=1

2. sudo update-initramfs -u

3. reboot or sudo modprobe -r iwlagn && sudo modprobe iwlagn

Ref: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/871254

works for me, EXCEPT that I need to do it every time I reboot :(

I wrote a script to spare me a bit of pain but I'd be SO grateful if someone could tell me why it's not persistent and mainly how to make it persistent!

Thanks everybody!

P.S. : my wifi controller details:

$ lspci -v
...
08:00.0 Network controller: Intel Corporation WiFi Link 5100
        Subsystem: Intel Corporation WiFi Link 5100 AGN
        Flags: bus master, fast devsel, latency 0, IRQ 45
        Memory at c0300000 (64-bit, non-prefetchable) [size=8K]
        Capabilities: <access denied>
        Kernel driver in use: iwlwifi
        Kernel modules: iwlwifi
...