Date: Mon, 12 Oct 2009 15:48:54 -0600
From: Alex Chiang <achiang@hp.com>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: Mark Lord <lkml@rtr.ca>, Greg KH <greg@kroah.com>,
       Linux Kernel <linux-kernel@vger.kernel.org>, jbarnes@virtuousgeek.org,
       linux-pci@vger.kernel.org
Subject: Re: pci-express hotplug
Message-ID: <20091012214854.GA14102@ldl.fc.hp.com>
References: <20091012120620.GG9228@kernel.dk> <20091012145254.GA1517@kroah.com> <20091012145700.GJ9228@kernel.dk> <4AD34494.7020602@rtr.ca> <20091012150603.GK9228@kernel.dk>
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> >>> On Mon, Oct 12, 2009 at 02:06:20PM +0200, Jens Axboe wrote:
> >>>> I'm trying to get pci-express hotplug working in a box here. I don't
> >>>> really care about the hotplug aspect, I just want the darn pci-e slots
> >>>> that are designated hotplug slots to actually WORK. When I load pciehp,
> >>>> I get:
> >>>>
> >>>> Firmware did not grant requested _OSC control
> >>>> Firmware did not grant requested _OSC control
> >>>> Firmware did not grant requested _OSC control
> >>>> Firmware did not grant requested _OSC control

This isn't just a benign message. It means the OS asked to take
over control of the slots and firmware really did say, "nope,
sorry".

Which means that this:

> On Mon, Oct 12 2009, Mark Lord wrote:
> > Tried this yet:
> >
> >   options pciehp pciehp_force=1

Is generally a bad idea.

Don't do it unless you really know your platform well.

> >> On Mon, Oct 12 2009, Greg KH wrote:
> >>> Can you try the acpiphp driver instead?  That's usually the
> >>> driver you want to use for "modern" systems (i.e. anything
> >>> made in the past 5 years.)
> >>
> >> I should have mentioned that I tried that too. It doesn't
> >> complain, but I don't see my cards anywhere afterwards. I'm
> >> a hotplug newbie, do I need to do anything else?

Can you modprobe acpiphp with debug=1? And send the output?

Thanks.

/ac

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