Mailing List Archive: Linux: Kernel

Keyboard driver not refreshing settings when unplugged.

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vhp at buffalo

Nov 11, 2009, 9:50 PM

Post #1 of 3 (110 views)
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Keyboard driver not refreshing settings when unplugged.

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
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hancockrwd at gmail

Nov 12, 2009, 6:04 PM

Post #2 of 3 (81 views)
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Re: Keyboard driver not refreshing settings when unplugged. [In reply to]

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..
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dmitry.torokhov at gmail

Nov 26, 2009, 5:22 PM

Post #3 of 3 (61 views)
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Re: Keyboard driver not refreshing settings when unplugged. [In reply to]

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.

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Dmitry
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