linux-kernel - Re: [HANG] Trouble with NEC-based USB adapter in PCMCIA slot on E7110

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Message-ID: <52054306.20500@rus.uni-stuttgart.de>
Date:	Fri, 09 Aug 2013 21:29:10 +0200
From:	Thomas Richter <richter@....uni-stuttgart.de>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	linux@...do.de, linux-kernel@...r.kernel.org
Subject: Re: [HANG] Trouble with NEC-based USB adapter in PCMCIA slot on E7110

On 09.08.2013 19:46, Alan Stern wrote:
> On Fri, 9 Aug 2013, Thomas Richter wrote:
>
>> Hi Alan, hi Dominik,
>>
>> maybe you want me to help out a bit - I'm having trouble getting a
>> Delock PCMCIA to USB-2 adapter to work under linux, with strange
>> behavior in some situations. The trouble is that while I can *read* via
>> fast (usb 2.0) transfers from the port, an ehci-triggered write just
>> locks up (it does not Oops, though) and I'm pretty much stuck narrowing
>> down the problem.
>
> The best way to start will be to enable CONFIG_USB_DEBUG in your kernel
> and post the dmesg log.  Also post a usbmon trace showing what happens
> when you try to write something.

Will try and report back, thanks. I've bisected it down in the meantime 
to a change from 2.6.31.6 to 2.6.32.6. Interestingly, this is very much 
the same time when the udev userland changed. It works with 2.6.31.6 old 
udev, but not with 2.6.36.2, new udev.

Probably the handover from full speed to USB 2.0 got broken?

Note that this laptop has now both uhci (legacy) and ohci (as by the 
pcmcia card, as companion of the ehci) chips, which probably adds to the 
problem.

Greetings,
	Thomas
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