netdev - Re: 3.0.0rc6: ethtool not working without a cable

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Date:	Wed, 20 Jul 2011 10:53:23 -0700 (Pacific Daylight Time)
From:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
To:	Arkadiusz Miskiewicz <a.miskiewicz@...il.com>
cc:	Ben Hutchings <bhutchings@...arflare.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: 3.0.0rc6: ethtool not working without a cable



On Wed, 6 Jul 2011, Arkadiusz Miskiewicz wrote:

> On Wednesday 06 of July 2011, Ben Hutchings wrote:
> > > If there is no cable then ethtool reports no device. It wasn't that
> > > before AFAIK.
> > > 
> > > ethtool version 2.6.36
> > > 
> > > 
> > > cable disconnected:
> > > 
> > > [root@...0 ~]# ethtool eth0
> > > Settings for eth0:
> > > Cannot get device settings: No such device
> > > Cannot get wake-on-lan settings: No such device
> > > Cannot get message level: No such device
> > > Cannot get link status: No such device
> > > No data available
> > > zsh: exit 75    ethtool eth0
> > > [root@...0 ~]# ethtool -i eth0
> > > Cannot get driver information: No such device
> > > zsh: exit 71    ethtool -i eth0

please check lspci -vvv on your device when cable is unplugged.  I'm 
wondering if OSPM (os power management) is kicking in (if enabled in your 
kernel) and somehow interacting badly with ethtool.

if the device is in D3, then most ethtool stuff won't work, since all the 
registers in the device (except in config space) don't work when in D3.
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