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Old 04-08-2010, 01:44 PM   #1
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"iwlagn Microcode SW error detected" -- Ubuntu v9.04 (Jaunty or Mint-7)

I'm getting messages in [b]/var/log/kern.log
Mar 29 11:09:39 XYZZY kernel: [12761.511290] iwlagn: Microcode SW error detected.  Restarting 0x82000000.
Mar 29 11:09:39 XYZZY kernel: [12761.549222] iwlagn: Can't stop Rx DMA.
Mar 29 11:09:39 XYZZY kernel: [12761.550377] iwlagn: MAC is in deep sleep!
Mar 29 11:09:39 XYZZY kernel: [12761.550420] iwlagn: No space for Tx
Mar 29 11:09:39 XYZZY kernel: [12761.550426] iwlagn: Error sending SENSITIVITY_CMD: enqueue_hcmd failed: -28
Mar 29 11:09:39 XYZZY kernel: [12761.550434] iwlagn: SENSITIVITY_CMD failed
At this point, nothing works to wake the network except a full reboot. If I try using dig I'm told "no server available". If I try ping myGatewayIP I'm told "no route to host." If the wifi mu-code crashed (1) I'd expect it something to re-load and re-start, and (2) it is reasonable that network everthing has stopped until that restart.

I have these modules:
sudo lsmod | grep iwl
[sudo] password for saint: *****
iwlagn                100228  0
iwlcore                93184  1 iwlagn
mac80211              217208  2 iwlagn,iwlcore
led_class              12036  2 iwlcore,thinkpad_acpi
cfg80211               38032  3 iwlagn,iwlcore,mac80211

sudo modinfo iwlagn | grep iwl
filename:       /lib/modules/2.6.28-11-generic/kernel/drivers/net/wireless/iwlwifi/iwlagn.ko
alias:          iwl4965
firmware:       iwlwifi-4965-2.ucode
firmware:       iwlwifi-5000-1.ucode
depends:        iwlcore,cfg80211,mac80211
My hardware is, in fact:
    description: Wireless interface
    product: PRO/Wireless 4965 AG or AGN [Kedron] Network Connection
    vendor: Intel Corporation
    physical id: 0
    bus info: pci@0000:03:00.0
    logical name: wmaster0
    version: 61
    serial: 00:1d:e0:89:6b:1f
    width: 64 bits
    clock: 33MHz
    capabilities: bus_master cap_list logical ethernet physical 
    configuration: broadcast=yes driver=iwlagn ip= latency=0 module=iwlagn multicast=yes wireless=IEEE 802.11abgn
Thoroughly stumpled ("stumped" + "trampled")
~~~ 0;-Dan
Old 04-08-2010, 02:25 PM   #2
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Here's a similar tale of woe:

These days I've tried the new Ubuntu 9.04, but I've found that my Intel PRO/Wireless 5100AGN card is not working with encryption. If I turn off the encryption on my AP, I'm able to establish a wireless connection

I see that this error seems quite popular with intel wireless cards.

I am surprised because more than 3 months I was using Kubuntu 8,10 and all the time I've used my wifi with WPA-PSK encryption enabled and never had such kind of problem...
However, this might be a potential solution:

Or perhaps this.

In in case, please see if a) disabling encryption makes a difference, and b) if either of these suggestions resolve the problem (*with* encryption ENABLED) Please let us know what happens!

Thanx in advance .. PSM


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