From: Claas Langbehn <claas@rootdir.de>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
linux-input@atrey.karlin.mff.cuni.cz,
Jiri Kosina <jkosina@suse.cz>
Subject: Re: [Linux-usb-users] reset low speed USB device using uhci_hcd (fwd)
Date: Fri, 16 Mar 2007 15:28:06 +0100 [thread overview]
Message-ID: <45FAA976.5050307@rootdir.de> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0703161015290.3349-100000@iolanthe.rowland.org>
Hello!
>> Going on a limb here - faulty USB cable causes USB resets which throws
>> off legacy emulation (which is done in SMM as well as KBC controller)
>> which causes KCB to lose bytes. I would expect also seeing some
>> keypresses not being registered but losing release is much more
>> visible...
>>
>
> It's possible. But the USB drivers try to take control of the host
> controllers away from the SMM BIOS. How could legacy support work with
> both SMM and the Linux USBHID system trying to handle it?
>
Please tell me what I can do to help to debug this strange behaviour.
Repuducing the USB resets is easy, but reproducing the PS/2 influence
takes long, since its hardly visible.
many regards,
claas
next prev parent reply other threads:[~2007-03-16 14:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-16 13:56 [Linux-usb-users] reset low speed USB device using uhci_hcd (fwd) Alan Stern
2007-03-16 14:06 ` Dmitry Torokhov
2007-03-16 14:17 ` Alan Stern
2007-03-16 14:28 ` Claas Langbehn [this message]
2007-03-16 15:10 ` Alan Stern
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