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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=45FAA976.5050307@rootdir.de \
--to=claas@rootdir.de \
--cc=dmitry.torokhov@gmail.com \
--cc=jkosina@suse.cz \
--cc=linux-input@atrey.karlin.mff.cuni.cz \
--cc=stern@rowland.harvard.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.