iwlagn is getting very shaky

[Norbert Preining]

Hi everyone

(please Cc),

I am currently running 3.1.0-rc10, and I am having a hard time with
the wlan network here at the university.

For quite some time, like 10min, it is fine, then suddently the
iwlagn driver gives up on me and connection is dropped.

In the log file I see:
[  172.137011] iwlagn 0000:06:00.0: Tx aggregation enabled on ra = 00:24:c4:ab:bd:ef tid = 0
[  821.841016] iwlagn 0000:06:00.0: Tx aggregation enabled on ra = 00:24:c4:ab:bd:ef tid = 6
[ 1095.580735] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 1/3)
[ 1095.780076] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 2/3)
[ 1095.980101] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 3/3)
[ 1096.180117] wlan0: direct probe to 00:24:c4:ab:bd:e0 timed out
[ 1105.255464] wlan0: deauthenticating from 00:24:c4:ab:bd:ef by local choice (reason=2)
[ 1105.255519] iwlagn 0000:06:00.0: Stopping AGG while state not ON or starting
[ 1105.265581] cfg80211: Calling CRDA for country: JP
[ 1105.271476] wlan0: authenticate with 00:24:c4:ab:bd:e0 (try 1)
[ 1105.468105] wlan0: authenticate with 00:24:c4:ab:bd:e0 (try 2)
[ 1105.668110] wlan0: authenticate with 00:24:c4:ab:bd:e0 (try 3)
[ 1105.868090] wlan0: authentication with 00:24:c4:ab:bd:e0 timed out
[ 1113.667890] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 1/3)
[ 1113.864116] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 2/3)
[ 1114.064095] wlan0: direct probe to 00:24:c4:ab:bd:e0 (try 3/3)
[ 1114.264109] wlan0: direct probe to 00:24:c4:ab:bd:e0 timed out

Somewhere around 1100 the connection is gone and never comes back again.

I tried removing the driver module from the kernel and reinserting it,
tried to turn on and off the hardware swithc (rfkill), all without
no success, the wlan connection remains dead until I reboot.

I am not sure exactely when it started, I guess somewhere in the
3.1 cycle, before I was permanently working wiht wlan, now I always
plug in the cable.

If there is any way to track down this, or any suggestions how I can
debug it, please let me know.

Hardware: Sony VGN-Z11, Intel(R) WiFi Link 5100 AGN, REV=0x54
L1 Enabled; Disabling L0S
device EEPROM VER=0x11e, CALIB=0x4
Device SKU: 0Xf0
Tunable channels: 13 802.11bg, 24 802.11a channels
loaded firmware version 8.83.5.1 build 33692 (EXP)


On the other hand, the same laptop with the very same configuration 
works very nicely in my flat's wlan, which is some dirt cheap Japanese
only wlan router.

Best wishes and thanks a lot

Norbert
------------------------------------------------------------------------
Norbert Preining            preining@{jaist.ac.jp, logic.at, debian.org}
JAIST, Japan                                 TeX Live & Debian Developer
DSA: 0x09C5B094   fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
------------------------------------------------------------------------
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