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To: linux-wireless@vger.kernel.org
From: Vladimir Linevich <vo.on3z@gmail.com>
Subject: Re: ath5k phy0: unsupported jumbo
Date: Mon, 26 Jul 2010 07:06:27 +0000 (UTC)
Message-ID: <loom.20100726T090249-29@post.gmane.org>
References: <20100123105111.GA24790@progeny.tock> <fe54d8c01001230418u3de7f4ccuc4fbfdecc7c76ebf@mail.gmail.com>  <20100123134005.GA11322@progeny.tock> <b6c5339f1001231032r155b380av93563a6febeeae2b@mail.gmail.com> <43e72e891001251025s1e3fa358v31527d1b5f7e3436@mail.gmail.com>
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I've found that this bug is a result of poor hardware ASPM support.
It is a hardware bug that is worked around in windows driver by
disabling PCIE ASPM L0S.
There's a solution - turn ASPM L0S off for this device.
---
1. Download enable-aspm
kernel org/pub/linux/kernel/people/mcgrof/aspm/enable-aspm

2. Get your root complex:
$ lspci -tv 
0000:00 
... 
+-1c.2-[0000:03]----00.0 Atheros Communications Inc. AR5001 Wireless Network 
Adapter 
...

00:1c.2 
3. Get your endpoint: 
$ lspci 
... 
03:00.0 Ethernet controller: Atheros Communications Inc. AR5001 Wireless Network 
Adapter (rev 01) 
...
= 03:00.0 

4. Now you neet to edit your enable-aspm

# You just need to modify these three values: 

ROOT_COMPLEX="00:1c.2" 
ENDPOINT="03:00.0" 

ASPM_SETTING=2 

5. Now executing: 
vo-one@acerone:~$ sudo bash enable-aspm 
[sudo] password for vo-one: 
Root complex: 
00:1c.2 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 3 (rev 
02) 
0x50 : 0x43 --> 0x42 ... [SUCCESS]] 
L1 only 

Endpoint: 
03:00.0 Ethernet controller: Atheros Communications Inc. AR5001 Wireless Network 
Adapter (rev 01) 
0x70 : 0x4B --> 0x4A ... [SUCCESS]] 
L1 only 

6. Making the script executed at system startup:
sudo chmod +x enable-aspm
sudo cp enable-aspm /usr/bin
sudo cat "enable-aspm" > /etc/rc.conf

hope that helps