intel centrino Wireless-N 1000 firmware is wrong under LTS 12.04

[Jacob_81]

After a fresh installation, I can't drive my wireless card, Intel Centrino Wireless-N 1000.
The problem is about the firmware used in LTS 12.04.

First I'm very sure that both my hardware switch and soft switch are on.
[code]
nico@jacob-pc:~$ rfkill list all
0: ideapad_wlan: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: ideapad_bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: no
2: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
5: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
nico@jacob-pc:~$
[/code]

Then when running 'iwconfig' command, I got this
[code]
nico@jacob-pc:~$ iwconfig
eth0 no wireless extensions.
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:off/any
          Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm
          Retry long limit:7 RTS thr:off Fragment thr:off
          Power Management:off
[/code]
This means the system can probe my card, but can't drive it.

Third, I used 'iwlist scan' command, 'ifup wlan0' command and 'dhclient wlan0' command, there are the outputs:
[code]
nico@jacob-pc:~$ iwlist scan
eth0 Interface doesn't support scanning.
lo Interface doesn't support scanning.
wlan0 Failed to read scan data : Network is down

nico@jacob-pc:~$ sudo ifup wlan0
[sudo] password for nico:
Ignoring unknown interface wlan0=wlan0.

nico@jacob-pc:~$ sudo dhclient wlan0
RTNETLINK answers: Input/output error
^C
[/code]
This means the system can't drive my card, there may be something wrong with the firmware.

After a long time trying, I found a way to solve this problem at last.
Download a older firmware from
http://wireless.kernel.org/en/users/Drivers/iwlwifi?action=AttachFile&do=get&target=iwlwifi-1000-ucode-128.50.3.1.tgz
This firmware is only for kernel 2.6.30+, the original one is for 3.2+. LTS 12.04 use a latest one from that website,
that's the reason. So just delete or rename the original one which is named iwlwifi-1000-5.ucode,
and put iwlwifi-1000-3.ucode from that tarball to /lib/firmware, and run 'modprobe -r iwlwifi',
 'modprobe iwlwifi', everything will be wonderful.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-firmware 1.79.1
ProcVersionSignature: Ubuntu 3.2.0-39.62-generic 3.2.39
Uname: Linux 3.2.0-39-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.2
Architecture: amd64
Date: Mon Apr 22 10:24:08 2013
Dependencies:

InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-firmware
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mantas Kriaučiūnas (mantas)]

Could you test if your Intel Centrino Wireless-N 1000 still doesn't work with latest Ubuntu 12.04.3 LTS (with kernel linux-image-3.8.0-xx) ?
Maybe problem was only with older Linux 3.2.0 kernels?

[RALOVICH, Kristóf (kristof-ralovich)]

This bug had been reported with at least one other distribution too: https://bugzilla.redhat.com/show_bug.cgi?id=903668

[RALOVICH, Kristóf (kristof-ralovich)]

This bug also occurs under Ubuntu 14.04.1 LTS with kernel" 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux"

[RALOVICH, Kristóf (kristof-ralovich)]

The same bug has already been reported for ubuntu 12.10: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/752829

[RALOVICH, Kristóf (kristof-ralovich)]

This problem/workaround has also been discussed elsewhere, e.g.: http://askubuntu.com/questions/131912/wireless-not-working-on-dell-xps-17-after-installing-12-04/165194#165194

[RALOVICH, Kristóf (kristof-ralovich)]

Unfortunately this problem is still present with both 16.04 and 18.04. Any hope someone looks at it?

[Po-Hsu Lin (cypressyew)]

Hello RALOVICH,
please open a new bug with command "ubuntu-bug linux".
Thank you.