linux-kernel - Re: Keyboard stops working after *lock [Was: 2.6.21-rc2-mm1]

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Message-ID: <Pine.LNX.4.44L0.0703151556420.2482-100000@iolanthe.rowland.org>
Date:	Thu, 15 Mar 2007 16:00:32 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Jiri Slaby <jirislaby@...il.com>
cc:	Jiri Kosina <jikos@...os.cz>, <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Keyboard stops working after *lock [Was: 2.6.21-rc2-mm1]

On Tue, 13 Mar 2007, Jiri Slaby wrote:

> So, do you mean rmmod uhci_hcd, unplug the keyboard, modprobe
> uhci_hcd, start usbmon, plug the keyboard, press numlock, stop usbmon,
> post it?

By the way, what happens if you press CapsLock rather than NumLock?  It 
should behave pretty the same, sending a command to the keyboard to change 
an LED setting.  Does the keyboard then stop working in the same way?

Alan Stern

P.S.: When you do your testing, please apply the patch below.  I don't 
know if it's related to your problem, but I did see this error show up in 
someone else's system log.


Index: usb-2.6/drivers/usb/host/uhci-q.c
===================================================================
--- usb-2.6.orig/drivers/usb/host/uhci-q.c
+++ usb-2.6/drivers/usb/host/uhci-q.c
@@ -139,8 +139,10 @@ static struct uhci_td *uhci_alloc_td(str
 
 static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
 {
-	if (!list_empty(&td->list))
+	if (!list_empty(&td->list)) {
 		dev_warn(uhci_dev(uhci), "td %p still in list!\n", td);
+		WARN_ON(1);
+	}
 	if (!list_empty(&td->fl_list))
 		dev_warn(uhci_dev(uhci), "td %p still in fl_list!\n", td);
 

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