linux-kernel - Re: Thinkpad X20 docking troubles

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Message-ID: <Pine.SOC.4.64.0907310007040.24315@math.ut.ee>
Date:	Fri, 31 Jul 2009 00:10:50 +0300 (EEST)
From:	Meelis Roos <mroos@...ux.ee>
To:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: Thinkpad X20 docking troubles - irq routing, USB strangeness

> The first is irq-related. As soon as yenta driver discovers the 
> additional ports, screaming irq happens and this shared irq is disabled.
> This documented in the dmesg below. This is my main problem, others may 
> be secondary to it (at least the usb one).

One more data point: the behaviour seems to be consistent at least since 
2.6.27 (the oldest sequential kernel I have around). I also have 2.6.21 
laying around, this kernel did not support docking at all.

Another data point: starting the system without dock and later docking, 
PCI devices in dock are not found and no yenta irq problems occur.

When docking, USB 4-port hub is found and works.

-- 
Meelis Roos (mroos@...ux.ee)
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