linux-kernel - Re: pci-express hotplug

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Date:	Mon, 12 Oct 2009 15:48:54 -0600
From:	Alex Chiang <achiang@...com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Mark Lord <lkml@....ca>, Greg KH <greg@...ah.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	jbarnes@...tuousgeek.org, linux-pci@...r.kernel.org
Subject: Re: pci-express hotplug

> >>> 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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