No Wifi on Xubuntu 12.04, Intel Centrino wireless-N 1000

[Christophe CATARINA]

Acer 1810 TZ; wifi was ok on my previous installation(Ubuntu 10.10).

Fresh install of Xubuntu 12.04, fully updated : cannot connect to my wifi network (Freebox V5)

I have seen here several bug reports that seem to challenge this chipset (centrino wireless-N), but nothing identical.
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/994104
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/876147

Within two hours of testing various (including deactivating wifi N), it hung the network twice for a few seconds (the password is then OK).
He will keep searching and asking for more network password regularly (WPA-TKIP).

As this bug affects (X)Ubuntu 12.04, it is not possible to use it on my laptop.
I have not found any workaround for this problem.

dmesg|grep iwl
[ 3.519565] iwlwifi 0000:02:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[ 3.519577] iwlwifi 0000:02:00.0: setting latency timer to 64
[ 3.519613] iwlwifi 0000:02:00.0: pci_resource_len = 0x00002000
[ 3.519617] iwlwifi 0000:02:00.0: pci_resource_base = ffffc9000067c000
[ 3.519621] iwlwifi 0000:02:00.0: HW Revision ID = 0x0
[ 3.519717] iwlwifi 0000:02:00.0: irq 44 for MSI/MSI-X
[ 3.519776] iwlwifi 0000:02:00.0: Detected Intel(R) Centrino(R) Wireless-N 1000 BGN, REV=0x6C
[ 3.557500] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[ 3.577551] iwlwifi 0000:02:00.0: device EEPROM VER=0x15d, CALIB=0x6
[ 3.577557] iwlwifi 0000:02:00.0: Device SKU: 0X50
[ 3.577561] iwlwifi 0000:02:00.0: Valid Tx ant: 0X1, Valid Rx ant: 0X3
[ 3.582693] iwlwifi 0000:02:00.0: Tunable channels: 13 802.11bg, 0 802.11a channels
[ 4.018819] iwlwifi 0000:02:00.0: loaded firmware version 39.31.5.1 build 35138
[ 4.057470] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
[ 4.346762] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S
[ 4.406942] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S

Sea also joinged logs

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-firmware 1.79
ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
Uname: Linux 3.2.0-27-generic x86_64
ApportVersion: 2.0.1-0ubuntu11
Architecture: amd64
Date: Sun Aug 5 19:52:50 2012
Dependencies:

InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=fr:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-firmware
UpgradeStatus: No upgrade log present (probably fresh install)

[Christophe CATARINA (christophe.catarina)]

I finally found a workaround based on limiting wifi to mode wifi G.

In a terminal :
echo "options iwlwifi 11n_disable = 1" | sudo tee / etc / modprobe.d / iwlwifi.conf
sudo modprobe -rfv iwlwifi
sudo modprobe iwlwifi

Now, the wifi works, even if limited in speed.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.5kernel[0] (Not a kernel in the daily directory) and install both the linux-image and linux-image-extra .deb packages.

Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. Please only remove that one tag and leave the other tags. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6-rc1-quantal/

[Christophe CATARINA (christophe.catarina)]

Hello,

I did the tests requested, here is the trace of my manipulations:
---------------
christophe@altair:~$ cd Téléchargements/
christophe@altair:~/Téléchargements$ ll *deb
-rw-rw-r-- 1 christophe christophe 12261522 août 6 18:45 linux-image-3.6.0-030600rc1-generic_3.6.0-030600rc1.201208022056_amd64.deb
-rw-rw-r-- 1 christophe christophe 24295412 août 6 18:45 linux-image-extra-3.6.0-030600rc1-generic_3.6.0-030600rc1.201208022056_amd64.deb
christophe@altair:~/Téléchargements$ sudo dpkg -i *.deb
[sudo] password for christophe:
Selecting previously unselected package linux-image-3.6.0-030600rc1-generic.
(Lecture de la base de données... 200045 fichiers et répertoires déjà installés.)
Dépaquetage de linux-image-3.6.0-030600rc1-generic (à partir de linux-image-3.6.0-030600rc1-generic_3.6.0-030600rc1.201208022056_amd64.deb) ...
Done.
Selecting previously unselected package linux-image-extra-3.6.0-030600rc1-generic.
Dépaquetage de linux-image-extra-3.6.0-030600rc1-generic (à partir de linux-image-extra-3.6.0-030600rc1-generic_3.6.0-030600rc1.201208022056_amd64.deb) ...
Paramétrage de linux-image-3.6.0-030600rc1-generic (3.6.0-030600rc1.201208022056) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.6.0-030600rc1-generic /boot/vmlinuz-3.6.0-030600rc1-generic
update-initramfs: Generating /boot/initrd.img-3.6.0-030600rc1-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 3.6.0-030600rc1-generic /boot/vmlinuz-3.6.0-030600rc1-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 3.6.0-030600rc1-generic /boot/vmlinuz-3.6.0-030600rc1-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.6.0-030600rc1-generic /boot/vmlinuz-3.6.0-030600rc1-generic
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.6.0-030600rc1-generic
Found initrd image: /boot/initrd.img-3.6.0-030600rc1-generic
Found linux image: /boot/vmlinuz-3.2.0-27-generic
Found initrd image: /boot/initrd.img-3.2.0-27-generic
Found linux image: /boot/vmlinuz-3.2.0-23-generic
Found initrd image: /boot/initrd.img-3.2.0-23-generic
Found memtest86+ image: /boot/memtest86+.bin
done
Paramétrage de linux-image-extra-3.6.0-030600rc1-generic (3.6.0-030600rc1.201208022056) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.6.0-030600rc1-generic /boot/vmlinuz-3.6.0-030600rc1-generic
update-initramfs: Generating /boot/initrd.img-3.6.0-030600rc1-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 3.6.0-030600rc1-generic /boot/vmlinuz-3.6.0-030600rc1-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 3.6.0-030600rc1-generic /boot/vmlinuz-3.6.0-030600rc1-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.6.0-030600rc1-generic /boot/vmlinuz-3.6.0-030600rc1-generic
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.6.0-030600rc1-generic
Found initrd image: /boot/initrd.img-3.6.0-030600rc1-generic
Found linux image: /boot/vmlinuz-3.2.0-27-generic
Found initrd image...

[Christophe CATARINA (christophe.catarina)]

Same bug confirmed on Sony VAIO VPC-EB3E1E, with same Wifi chipset : Intel(R) Centrino(R) Wireless-N 1000

Fortunately, the same workaround can resolve the issue by limiting wifi modes to B/G

[Christopher Bainbridge (cebainbridge)]

This bug still exists. How has no one done anything about it yet?

Running Ubuntu 13.04 and I can confirm this STILL EXISTS.

[Christophe CATARINA (christophe.catarina)]

I can confirm that the bug is still present in 3.2.0-40.
I noticed when updating the kernel, the paliatif disappeared and I had to reinstall it.
Fortunately, it is still effective.

Linux altair 3.2.0-40-generic #64-Ubuntu SMP Mon Mar 25 21:22:10 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

[Christopher M. Peñalver (penalvch)]

Christophe CATARINA, could you please confirm this issue exists with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ . If the issue remains, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-v3.11-rc4

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

If you are unable to test the mainline kernel, please comment as to why specifically you were unable to test it and add the following tags:
kernel-unable-to-test-upstream
kernel-unable-to-test-upstream-VERSION-NUMBER

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]