Ubuntu

iwl3945 driver bugs

Bug #596203 reported by DimitryPolivaev on 2010-06-19

This bug report is a duplicate of: Bug #348204: [Jaunty] Intel wireless 3945ABG is unstable and disconnects frequently. Edit Remove

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	Ubuntu	New	Undecided	Unassigned

Bug Description

After upgrading to lucid I got an unstable wifi connection: it frequently got lost and was sometimes not able to reconnect. The problem was logged as follows:

-----kern.log fragment begin -----
Jun 13 11:21:52 dimitry-laptop kernel: [10999.508078] No probe response from AP 00:18:9b:68:d4:3f after 500ms, disconnecting.
Jun 13 11:21:55 dimitry-laptop kernel: [11002.350862] wlan0: direct probe to AP 00:18:9b:68:d4:3f (try 1)
Jun 13 11:21:55 dimitry-laptop kernel: [11002.548070] wlan0: direct probe to AP 00:18:9b:68:d4:3f (try 2)
Jun 13 11:21:56 dimitry-laptop kernel: [11002.748067] wlan0: direct probe to AP 00:18:9b:68:d4:3f (try 3)
Jun 13 11:21:56 dimitry-laptop kernel: [11002.948065] wlan0: direct probe to AP 00:18:9b:68:d4:3f timed out
Jun 13 11:22:08 dimitry-laptop kernel: [11015.212626] wlan0: direct probe to AP 00:18:9b:68:d4:3f (try 1)
Jun 13 11:22:08 dimitry-laptop kernel: [11015.412114] wlan0: direct probe to AP 00:18:9b:68:d4:3f (try 2)
Jun 13 11:22:08 dimitry-laptop kernel: [11015.612078] wlan0: direct probe to AP 00:18:9b:68:d4:3f (try 3)
Jun 13 11:22:08 dimitry-laptop kernel: [11015.616381] wlan0: direct probe responded
Jun 13 11:22:08 dimitry-laptop kernel: [11015.616389] wlan0: authenticate with AP 00:18:9b:68:d4:3f (try 1)
Jun 13 11:22:08 dimitry-laptop kernel: [11015.620184] wlan0: authenticated
Jun 13 11:22:08 dimitry-laptop kernel: [11015.620227] wlan0: associate with AP 00:18:9b:68:d4:3f (try 1)
Jun 13 11:22:08 dimitry-laptop kernel: [11015.624148] wlan0: RX AssocResp from 00:18:9b:68:d4:3f (capab=0x411 status=0 aid=3)
Jun 13 11:22:08 dimitry-laptop kernel: [11015.624156] wlan0: associated
Jun 13 11:28:33 dimitry-laptop kernel: [11400.556083] No probe response from AP 00:18:9b:68:d4:3f after 500ms, disconnecting.
-----kern.log fragment end -----

After looking for help in forums I found out that the problem can be solved by executing a command

echo 'options iwl3945 disable_hw_scan=1' | sudo tee /etc/modprobe.d/options-iwl3945.conf

setting an option to disable a hardware scan for iwl3945 which probably should be the default because the hardware scan seems to make probelms . After executing this command and reboot the wifi connection remains stable, but another problem comes: following messages are added to kern.log every two minutes:

----kern.log fragment begin ----
Jun 19 10:17:51 dimitry-laptop kernel: [ 6931.868077] iwl3945 0000:0b:00.0: Failed to get channel info for channel 100 [0]
Jun 19 10:17:52 dimitry-laptop kernel: [ 6932.292076] iwl3945 0000:0b:00.0: Failed to get channel info for channel 104 [0]
Jun 19 10:17:52 dimitry-laptop kernel: [ 6932.716078] iwl3945 0000:0b:00.0: Failed to get channel info for channel 108 [0]
Jun 19 10:17:53 dimitry-laptop kernel: [ 6933.140077] iwl3945 0000:0b:00.0: Failed to get channel info for channel 112 [0]
Jun 19 10:17:53 dimitry-laptop kernel: [ 6933.564085] iwl3945 0000:0b:00.0: Failed to get channel info for channel 116 [0]
Jun 19 10:17:54 dimitry-laptop kernel: [ 6933.988073] iwl3945 0000:0b:00.0: Failed to get channel info for channel 120 [0]
Jun 19 10:17:54 dimitry-laptop kernel: [ 6934.416079] iwl3945 0000:0b:00.0: Failed to get channel info for channel 124 [0]
Jun 19 10:17:54 dimitry-laptop kernel: [ 6934.844068] iwl3945 0000:0b:00.0: Failed to get channel info for channel 128 [0]
Jun 19 10:17:55 dimitry-laptop kernel: [ 6935.268072] iwl3945 0000:0b:00.0: Failed to get channel info for channel 132 [0]
Jun 19 10:17:55 dimitry-laptop kernel: [ 6935.692078] iwl3945 0000:0b:00.0: Failed to get channel info for channel 136 [0]
Jun 19 10:17:56 dimitry-laptop kernel: [ 6936.120085] iwl3945 0000:0b:00.0: Failed to get channel info for channel 140 [0]
Jun 19 10:19:51 dimitry-laptop kernel: [ 7051.868087] iwl3945 0000:0b:00.0: Failed to get channel info for channel 100 [0]
Jun 19 10:19:52 dimitry-laptop kernel: [ 7052.292083] iwl3945 0000:0b:00.0: Failed to get channel info for channel 104 [0]
Jun 19 10:19:52 dimitry-laptop kernel: [ 7052.716081] iwl3945 0000:0b:00.0: Failed to get channel info for channel 108 [0]
Jun 19 10:19:53 dimitry-laptop kernel: [ 7053.140081] iwl3945 0000:0b:00.0: Failed to get channel info for channel 112 [0]
Jun 19 10:19:53 dimitry-laptop kernel: [ 7053.564092] iwl3945 0000:0b:00.0: Failed to get channel info for channel 116 [0]
Jun 19 10:19:54 dimitry-laptop kernel: [ 7053.988089] iwl3945 0000:0b:00.0: Failed to get channel info for channel 120 [0]
Jun 19 10:19:54 dimitry-laptop kernel: [ 7054.412082] iwl3945 0000:0b:00.0: Failed to get channel info for channel 124 [0]
Jun 19 10:19:54 dimitry-laptop kernel: [ 7054.840086] iwl3945 0000:0b:00.0: Failed to get channel info for channel 128 [0]
Jun 19 10:19:55 dimitry-laptop kernel: [ 7055.264088] iwl3945 0000:0b:00.0: Failed to get channel info for channel 132 [0]
Jun 19 10:19:55 dimitry-laptop kernel: [ 7055.688092] iwl3945 0000:0b:00.0: Failed to get channel info for channel 136 [0]
Jun 19 10:19:56 dimitry-laptop kernel: [ 7056.112085] iwl3945 0000:0b:00.0: Failed to get channel info for channel 140 [0]
----kern.log fragment end ----

So it looks like there are two different problems in iwl3945.

Regards,
Dimitry Polivaev

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: linux-image-2.6.32-22-generic 2.6.32-22.36
Regression: No
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: dimitry 1302 F.... pulseaudio
/dev/snd/controlC0: dimitry 1302 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xefebc000 irq 21'
   Mixer name : 'SigmaTel STAC9200'
   Components : 'HDA:83847690,102801bd,00102201 HDA:14f12bfa,14f100c3,00090000'
   Controls : 11
   Simple ctrls : 6
Card1.Amixer.info:
Card hw:1 'U0x46d0x8da'/'USB Device 0x46d:0x8da at usb-0000:00:1d.0-1, full speed'
   Mixer name : 'USB Mixer'
   Components : 'USB046d:08da'
   Controls : 3
   Simple ctrls : 2
Date: Sat Jun 19 10:48:02 2010
Frequency: Once a day.
HibernationDevice: RESUME=UUID=c83a8931-8f8f-4498-8f8f-c9ffbf875057
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: Dell Inc. MM061
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=UUID=c25b28ed-5afd-46c6-bfde-dcdbc559f526 ro quiet splash
ProcEnviron:
PATH=(custom, user)
LANG=en_US.utf8
SHELL=/bin/bash
RelatedPackageVersions: linux-firmware 1.34
SourcePackage: linux
dmi.bios.date: 04/02/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A14
dmi.board.name: 0KD882
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA14:bd04/02/2007:svnDellInc.:pnMM061:pvr:rvnDellInc.:rn0KD882:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: MM061
dmi.sys.vendor: Dell Inc.

Revision history for this message

DimitryPolivaev (dpolivaev) wrote on 2010-06-19:

AlsaDevices.txt Edit (701 bytes, text/plain; charset="utf-8")
AplayDevices.txt Edit (281 bytes, text/plain; charset="utf-8")
ArecordDevices.txt Edit (285 bytes, text/plain; charset="utf-8")
BootDmesg.txt Edit (44.0 KiB, text/plain; charset="utf-8")
Card0.Amixer.values.txt Edit (1.1 KiB, text/plain; charset="utf-8")
Card0.Codecs.codec.0.txt Edit (4.8 KiB, text/plain; charset="utf-8")
Card0.Codecs.codec.1.txt Edit (145 bytes, text/plain; charset="utf-8")
Card1.Amixer.values.txt Edit (321 bytes, text/plain; charset="utf-8")
CurrentDmesg.txt Edit (73.0 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (1.3 KiB, text/plain; charset="utf-8")
IwConfig.txt Edit (562 bytes, text/plain; charset="utf-8")
Lspci.txt Edit (11.9 KiB, text/plain; charset="utf-8")
Lsusb.txt Edit (539 bytes, text/plain; charset="utf-8")
PciMultimedia.txt Edit (595 bytes, text/plain; charset="utf-8")
ProcCpuinfo.txt Edit (1.4 KiB, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (1.6 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (3.3 KiB, text/plain; charset="utf-8")
RfKill.txt Edit (120 bytes, text/plain; charset="utf-8")
UdevDb.txt Edit (120.9 KiB, text/plain; charset="utf-8")
UdevLog.txt Edit (262.1 KiB, text/plain; charset="utf-8")
WifiSyslog.txt Edit (88.4 KiB, text/plain; charset="utf-8")

Revision history for this message

DimitryPolivaev (dpolivaev) wrote on 2010-06-19:

The bug turned out to be a duplicate of bug 348204 "Intel wireless 3945ABG is unstable and disconnects frequently"

Revision history for this message

Ben Bromley (benuski) wrote on 2010-06-20:

Thank you for taking the time to report this bug and helping to make Ubuntu better. As you have said, this particular bug has already been reported and is a duplicate of bug 348204, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

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