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
>