linux-kernel - Re: Keyboard driver not refreshing settings when unplugged.

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Date:	Thu, 26 Nov 2009 17:22:49 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Robert Hancock <hancockrwd@...il.com>
Cc:	Vincent Perricone <vhp@...falo.edu>, linux-kernel@...r.kernel.org
Subject: Re: Keyboard driver not refreshing settings when unplugged.

On Thu, Nov 12, 2009 at 08:04:47PM -0600, Robert Hancock wrote:
> On 11/11/2009 11:50 PM, Vincent Perricone wrote:
>> I noticed a bug which may possibly be part of the Linux kernel.  If
>> one were to enable a setting on the keyboard(caps lock) and then
>> unplug that keyboard.  Upon re-plugging it in or another, the system
>> will still keep caps lock enabled.  When the user then goes and
>> enables caps lock on their own keyboard which assumes the setting is
>> disabled, the system then turns caps lock off, even though the user
>> wanted it on.
>>
>> 2.6.31-14-generic
>
> USB or PS/2 keyboard? I don't know that the kernel even can tell if a  
> PS/2 keyboard has been unplugged or not..

Depends on the box. PS/2 devices normally send 0xaa 0x00 when plugged in
but that may get suppressed, especially on laptops.

-- 
Dmitry
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