linux-kernel - Re: Linux Support for Thunderbolt using Apple Monitor

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Message-ID: <4FA358ED.1080705@gmail.com>
Date:	Fri, 04 May 2012 14:19:57 +1000
From:	Francois Rigaut <frigaut@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	Nico Schottelius <nico-linux-20120419@...ottelius.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Linux Support for Thunderbolt using Apple Monitor

Greg, Nico,

Thanks Greg for giving us some attention. I went ahead and collected a 
number of information that could be useful to track down our hotplug issue.

1) Coldplug: Booting with the thunderbolt display attached. This works. 
Several devices (additional to what I get without the display attached) 
are listed. Here is the relevant info:

http://maumae.net/thunderbolt/coldplug_efi/log  -> kernel.log
http://maumae.net/thunderbolt/coldplug_efi/lspci -> lspci and lspci -vv
http://maumae.net/thunderbolt/coldplug_efi/lsmod
http://maumae.net/thunderbolt/coldplug_efi/config_excerpt.txt
full config @ http://maumae.net/thunderbolt/config.gz
http://maumae.net/thunderbolt/coldplug_efi/disconnect -> message when 
disconnecting (pciehp loaded just before)

note that an attempt to reconnect leads to the same issue as described 
before, i.e. nothing happens.

2) Booting with the display/device not plugged, just for reference:

http://maumae.net/thunderbolt/notplugged_efi/log
http://maumae.net/thunderbolt/notplugged_efi/lsmod
http://maumae.net/thunderbolt/notplugged_efi/misc
http://maumae.net/thunderbolt/notplugged_efi/lspci

3) Again, I have tried to load pciehp and acpiphp with both EFI boot and 
BIOS emulation boot:
- pciehp loads ok but as I said earlier, no message whatsoever in 
everything.log when I try to connect the thunderbolt display
- acpiphp: I was wrong yesterday. In fact, trying to load acpiphp gives 
me a message:
[root@...iahu thunderbolt]# modprobe acpiphp
ERROR: could not insert 'acpiphp': No such device

Not sure what to make of it. I have tried to also load acpiphp after a 
coldplug boot; same error message.

I've read somewhere that this error message may mean that the h/w 
doesn't support hotplugging. However, I think the coldplug lspci -vv 
above tells us the h/w does support pcie hotplug: all the pci bridges 
appear to have D3hot+ capability (and it certainly does, as this works 
under osx on the same machine).

Any suggestion are welcome! Thanks.
Francois

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