From mboxrd@z Thu Jan 1 00:00:00 1970 From: Claas Langbehn Subject: Re: [Linux-usb-users] reset low speed USB device using uhci_hcd (fwd) Date: Fri, 16 Mar 2007 15:28:06 +0100 Message-ID: <45FAA976.5050307@rootdir.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: owner-linux-input@atrey.karlin.mff.cuni.cz List-Help: List-Owner: List-Post: List-Unsubscribe: To: Alan Stern Cc: Dmitry Torokhov , linux-input@atrey.karlin.mff.cuni.cz, Jiri Kosina List-Id: linux-input@vger.kernel.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