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From: Luca Coelho <luca@coelho.fi>
To: Pali =?ISO-8859-1?Q?Roh=E1r?= <pali.rohar@gmail.com>,
        linux-wireless@vger.kernel.org, ilw@linux.intel.com
Date: Mon, 12 Feb 2018 20:48:47 +0200
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Subject: Re: Centrino Advanced-N 6235 - Microcode SW error detected
Sender: linux-wireless-owner@vger.kernel.org
List-ID: <linux-wireless.vger.kernel.org>

On Tue, 2018-01-30 at 20:49 +0100, Pali Rohár wrote:
> Hello,

Hi Pali,


> for almost 3 years I have a problem with Intel wifi card Centrino
> Advanced-N 6235. Its firmware periodically crash and in dmesg I'm
> seeing
> a message "Microcode SW error detected".
> 
> Problem happens independently of kernel versions (I tried 3.8, 3.13,
> 3.18, 4.0, 4.9). Currently I'm using Debian Stretch and its 4.9
> version.
> 
> This wifi card is identified as:
> 
> $ lspci -s 03:00.0 -vv
> 03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 24)
>         Subsystem: Intel Corporation Centrino Advanced-N 6235 AGN

[...]

> And here is example of dmesg error flood:
> 
> [26624.998823] iwlwifi 0000:03:00.0: Microcode SW error detected.  Restarting 0x2000000.

[...]

> [26624.999013] iwlwifi 0000:03:00.0: Loaded firmware version: 18.168.6.1
> [26624.999117] iwlwifi 0000:03:00.0: Start IWL Error Log Dump:
> [26624.999118] iwlwifi 0000:03:00.0: Status: 0x000002CC, count: 6
> [26624.999120] iwlwifi 0000:03:00.0: 0x000028AA | ADVANCED_SYSASSERT          
> [27464.823779] iwlwifi 0000:03:00.0: Loaded firmware version: 18.168.6.1
> [27464.823903] iwlwifi 0000:03:00.0: Start IWL Error Log Dump:
> [27464.823904] iwlwifi 0000:03:00.0: Status: 0x000002CC, count: 6
> [27464.823906] iwlwifi 0000:03:00.0: 0x000028AA | ADVANCED_SYSASSERT          

[...]

> This really looks like firmware problem. What can I do with these
> microcode errors? Can you help me?

Yes, this is a firmware problem.  But unfortunately this is a really
old hardware (6 years old) and we don't support the firmware anymore. 
I'm sorry, but there is really nothing we can do.

I hope the driver manages to recover properly and WiFi continues to
work on your machine without much disturbance when this happens.

--
Cheers,
Luca.