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Date: Thu, 3 May 2012 08:35:47 -0700
From: Greg KH <gregkh@linuxfoundation.org>
To: Francois Rigaut <frigaut@gmail.com>
Cc: Nico Schottelius <nico-linux-20120419@schottelius.org>,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: Linux Support for Thunderbolt using Apple Monitor
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On Thu, May 03, 2012 at 09:45:00PM +1000, Francois Rigaut wrote:
> After Greg pointed to the PCIE, I realized that modules related to PCIE
> hotpluging were not loaded in my config. I then did a whole bunch of test
> modprobing a couple of modules: pciehp (with and without pciehp_force and/or
> pciehp_poll_mode) and acpiphp (not together obviously). No change:connecting
> the thunderbolt does not lead to any kernel activity. No message whatsoever in
> /var/log/everything.log.
> Checked /sys/bus/pci/slots, nothing appeared. No change in lspci. Added a "echo
> 1 > /sys/bus/pci/rescan" for good measure to no avail.

Does anything show up in there at all?

How about if you load the acpiphp module instead?  Some BIOSes use that
instead of pciehp.

You need one of those drivers in order for this to work properly.

Also, speaking of BIOS, make sure you have the latest updates, there
were a lot of initial problems with Thunderbolt hotplug issues that were
fixed in newer BIOS versions, so that will be required to be updated.

thanks,

greg k-h