From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Dmitry Torokhov" Subject: Re: [Linux-usb-users] reset low speed USB device using uhci_hcd (fwd) Date: Fri, 16 Mar 2007 10:06:24 -0400 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Content-Disposition: inline Sender: owner-linux-input@atrey.karlin.mff.cuni.cz List-Help: List-Owner: List-Post: List-Unsubscribe: To: Alan Stern Cc: linux-input@atrey.karlin.mff.cuni.cz, Jiri Kosina , Claas Langbehn List-Id: linux-input@vger.kernel.org On 3/16/07, Alan Stern wrote: > Take a look at the message below. It turned out that the USB errors went > away when Claas removed a USB extension cable, but that doesn't explain > the peculiar keyboard-mouse interaction -- especially since it's a PS/2 > keyboard. Any ideas? > 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... -- Dmitry