linux-kernel - Re: 2.6.26-rc1 regression since 2.6.25

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Date:	Tue, 20 May 2008 10:39:42 +0200
From:	Lukas Hejtmanek <xhejtman@....muni.cz>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Greg KH <greg@...ah.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>
Subject: Re: 2.6.26-rc1 regression since 2.6.25

On Mon, May 19, 2008 at 11:47:11AM -0400, Alan Stern wrote:
> > > > http://bugzilla.kernel.org/show_bug.cgi?id=10630
> 
> Can you attach an equivalent dmesg log for 2.6.25 (with
> CONFIG_USB_DEBUG enabled, of course)?

attached.

> Let me get this straight.  You booted without the dock, and then at 
> this line:
> 
> > [14315425.975807] ACPI: \_SB_.GDCK - docking
> 
> you plugged the computer into the dock, right?

Yup.

> 
> Then apparently here:
> 
> > [14315508.451197] ehci_hcd 0000:00:1a.7: port 4 remote wakeup
> 
> you plugged the USB drive into the dock, but it wasn't detected.  Or
> maybe I've got it backward, the drive was already plugged in when you
> docked the computer, and 14315508.451197 is when you unplugged the
> drive.  Which was it?

More precisly, it was already plugged but the external power of the USB drive 
was switched off and I just switched it on after I had docked. 

> Okay, let's see some more debugging information on this.  Get a usbmon
> trace (see Documentation/usb/usbmon.txt) for bus 3, starting just 
> before you dock the computer.  That will tell us exactly what the 
> dock's USB hub is reporting.

Moreover, I discovered that removing ehci module before I put the machine into
the dock causes the uhci module to discover the USB device. Dmesg traces are
attached.

Do you still need the usbmon traces?

-- 
Lukáš Hejtmánek
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