Comment 112 for bug 630748

Hey Mikael,
With this flag on, does the card still scan available networks or you have
to manually set them up? Seems like you found a better workaround than the
one I was using (disabling 802.11n altogether).

Pedro Nariyoshi

On Wed, Oct 10, 2012 at 4:35 AM, Mikael Broström
<email address hidden>wrote:

> Hi!
>
> Have issues with my 5300 card, and i made some testing.
>
> wireless n is unstable if you add ap_scan=1 or scan_ssid=1 in
> wpa_supplicant.conf
> if i set them to 0 and add my network into wpa_supplicant.conf it connects
> at 300mbit/s if i do som bwtesting i get good n performance! as soon as i
> enable one of these settings, the tx bitrates starts jumping up and down...
> if i enable debugging i wpa_supplicant i can see that it goes down to
> 1mbit everytime a "CTRL-EVENT-SCAN-RESULTS" is made.
>
> iw wlan0 link
> tx bitrate: 1 Mbit/s - when scanning (jumping up and down)
> tx bitrate: 300 Mbit/s - when scanning is disabled.
>
> dont't know if it help you to figure out the problem
> i still get some Tx excessive retries: and Invalid misc: but the
> performance is better!
>
> /Mikael
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/630748
>
> Title:
> iwlagn degrades quickly during normal wifi session
>
> Status in The Linux Kernel:
> Fix Released
> Status in Release Notes for Ubuntu:
> Fix Released
> Status in “linux-firmware” package in Ubuntu:
> Won't Fix
> Status in “module-init-tools” package in Ubuntu:
> Fix Released
> Status in “linux-firmware” source package in Maverick:
> Won't Fix
> Status in “module-init-tools” source package in Maverick:
> Fix Released
> Status in “linux-firmware” source package in Natty:
> Won't Fix
> Status in “module-init-tools” source package in Natty:
> Fix Released
>
> Bug description:
> I recently upgraded my lucid laptop (thinkpad X200s) to maverick. I
> found after the reboot that my wireless degrades after about 8 hours
> of ordinary use. I had 45% packet loss direct to my WAP, and this was
> easily cleared up by doing "modprobe -r iwlagn; modprobe iwlagn" as
> root.
>
> I'd not be so quick to file this except that Paul Collins told me that
> he'd seen the same behavior from upstream 2.6.35.
>
> ProblemType: Bug
> DistroRelease: Ubuntu 10.10
> Package: linux-image-2.6.35-19-generic 2.6.35-19.28
> Regression: Yes
> Reproducible: Yes
> ProcVersionSignature: Ubuntu 2.6.35-19.28-generic 2.6.35.3
> Uname: Linux 2.6.35-19-generic x86_64
> AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
> Architecture: amd64
> ArecordDevices:
> **** List of CAPTURE Hardware Devices ****
> card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
> Subdevices: 1/1
> Subdevice #0: subdevice #0
> AudioDevicesInUse:
> USER PID ACCESS COMMAND
> /dev/snd/controlC0: nick 2188 F.... pulseaudio
> CRDA: Error: [Errno 2] No such file or directory
> Card0.Amixer.info:
> Card hw:0 'Intel'/'HDA Intel at 0xf2620000 irq 47'
> Mixer name : 'Conexant CX20561 (Hermosa)'
> Components : 'HDA:14f15051,17aa20ff,00100000'
> Controls : 14
> Simple ctrls : 7
> Card29.Amixer.info:
> Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30,
> fw 7XHT22WW-1.04'
> Mixer name : 'ThinkPad EC 7XHT22WW-1.04'
> Components : ''
> Controls : 1
> Simple ctrls : 1
> Card29.Amixer.values:
> Simple mixer control 'Console',0
> Capabilities: pswitch pswitch-joined penum
> Playback channels: Mono
> Mono: Playback [on]
> Date: Sun Sep 5 11:24:24 2010
> EcryptfsInUse: Yes
> HibernationDevice: RESUME=UUID=093be503-d248-45fa-a7fe-77cdd35c0f5a
> MachineType: LENOVO 7465CTO
> ProcCmdLine: root=UUID=5237fceb-23d0-412d-84d9-b8f8b3bf28af ro quiet
> splash
> ProcEnviron:
> LC_COLLATE=C
> PATH=(custom, user)
> LANG=en_US.UTF-8
> SHELL=/bin/bash
> RelatedPackageVersions: linux-firmware 1.38
> SourcePackage: linux
> WpaSupplicantLog:
>
> dmi.bios.date: 06/25/2009
> dmi.bios.vendor: LENOVO
> dmi.bios.version: 6DET55WW (3.05 )
> dmi.board.name: 7465CTO
> dmi.board.vendor: LENOVO
> dmi.board.version: Not Available
> dmi.chassis.asset.tag: No Asset Information
> dmi.chassis.type: 10
> dmi.chassis.vendor: LENOVO
> dmi.chassis.version: Not Available
> dmi.modalias:
> dmi:bvnLENOVO:bvr6DET55WW(3.05):bd06/25/2009:svnLENOVO:pn7465CTO:pvrThinkPadX200s:rvnLENOVO:rn7465CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
> dmi.product.name: 7465CTO
> dmi.product.version: ThinkPad X200s
> dmi.sys.vendor: LENOVO
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/linux/+bug/630748/+subscriptions
>