linux-kernel - Re: wifi iwlagn fails to authenticate after wake from suspend

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Date:	Sun, 01 Jan 2012 18:26:59 -0500
From:	Gene Smith <gds@...rtertn.net>
To:	linux-kernel@...r.kernel.org
Cc:	linux-wireless@...r.kernel.org
Subject: Re: wifi iwlagn fails to authenticate after wake from suspend

On 12/12/2011 09:48 AM, wwguy wrote:
> On Sun, 2011-12-11 at 22:36 -0800, Matías Aguirre wrote:
>> Hi,
>>
>> On Sat, Oct 29, 2011 at 2:32 AM, Gene Smith<gds@...rtertn.net>  wrote:
>>> David Rientjes wrote, On 10/26/2011 02:27 AM:
>>>> So we need to bisect between 2.4.38 and 3.0.0? :)  I'm running ubuntu
>>>> 11.10 on a home laptop so I'll give this a try as well when I can if I can
>>>> put up with unity for that long.
>>
>> I've bisected the problem and narrowed the bug to changeset 73b78a2272
>> (http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=73b78a22720087d2d384bdd49e9c25500ba73edd).
>>
>> Here's a patch, that applies against 3.2-rc5, that fixed the error for me:
>>
>> diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c
>> b/drivers/net/wireless/iwlwifi/iwl-agn.c
>> index bacc06c..01d5d38 100644
>> --- a/drivers/net/wireless/iwlwifi/iwl-agn.c
>> +++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
>> @@ -1297,7 +1297,7 @@ int iwl_alive_start(struct iwl_priv *priv)
>>                                           BT_COEX_PRIO_TBL_EVT_INIT_CALIB2);
>>                  if (ret)
>>                          return ret;
>> -       } else {
>> +       } else if (priv->cfg->bt_params) {
>>                  /*
>>                   * default is 2-wire BT coexexistence support
>>                   */
> this is not right, you stop the bt coex for non-combo device.
> maybe you system has issue with BT, we seen this happen on some cases.
> try the following module parameter and see if help
>
> $sudo modprobe iwlagn bt_coex_active=0
>
> Thanks
> Wey
>

Unfortunately the latest fedora 16 kernel, 3.1.6-1.fc16.x86_64, renders 
this fix
ineffective and again cannot resume wifi after a sleep and must reboot.
Therefore must stay with older kernels for this to work and for wifi to 
resume
after sleep:
3.1.5-6.fc16 is still OK with bt_coex_active=0
3.1.5-2.fc16 is also still OK with this fix.




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