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Date: Sat, 14 Aug 2010 08:06:20 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Ian FREISLICH <ianf@clue.co.za>
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Cc: pyunyh@gmail.com, "Sergey V. Dyatko" <sergey.dyatko@gmail.com>,
	freebsd-current@freebsd.org
Subject: Re: if_alc trouble 
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On Sat, 14 Aug 2010, Ian FREISLICH wrote:

> Pyun YongHyeon wrote:
>> I'm working on it but I was not able to reproduce the issue on my
>> AR8131/AR8132/AR8151/AR8152 sample boards. However it seems AR8132
>> is the only controller that shows this issue and I vaguely remember
>> a couple of users reported the issue.
>> I'll update PR 148772 if I manage to find some clue.
>
> I have the same problem with the alc on my compaq mini.  Perhaps
> it is related to the PHY mismatch.  For some reason they coupled a
> GE PHY with a FE controller.  I need to stop my switch advertising
> 1000M for the laptop to autonegotiate the link speed.

Acer Aspire One D250 has the same chip and problem (8.1-stable):

alc0: <Atheros AR8132 PCIe Fast Ethernet> port 0x2000-0x207f mem 0x55000000-0x5503ffff irq 18 at device 0.0 on pci3
alc0: 15872 Tx FIFO, 15360 Rx FIFO
alc0: Using 1 MSI message(s).
miibus0: <MII bus> on alc0
atphy0: <Atheros F1 10/100/1000 PHY> PHY 0 on miibus0
atphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
alc0: Ethernet address: 00:23:5a:80:d8:7a
alc0: [FILTER]

Forcing it to a fixed speed works:
ifconfig_alc0="SYNCDHCP media 100baseTX"