linux-kernel - Re: i8046: unbind/bind issue with laptop system password set

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Date:	Fri, 14 Nov 2008 12:38:40 +0000
From:	Nick Warne <nick@...sn.org>
To:	linux-kernel@...r.kernel.org
Subject: Re: i8046:  unbind/bind issue with laptop system password set

On Fri, 14 Nov 2008 12:30:58 +0000
Nick Warne <nick@...sn.org> wrote:

> Hi all,
> 
> This is a strange one.  My laptop, a Dell Inspiron 6400 (UK model
> MM061) has a BIOS option to set system password that is required on
> boot/reboot/and on waking up from suspend to RAM (sleep).
> 
> This works fine, but after I enter my password during resume, I find
> my keyboard has gone AWOL (no keys mapped, all keys auto repeat etc.)
> and shortly mouse buttons die too... so all I can do now is hit the
> power off button!
> 
> log/messages spews out lots of this stuff:
> Nov 14 11:36:36 palantir kernel: [10330.783152] atkbd.c: Unknown key
> pressed (raw set 2, code 0x28 on isa0060/serio0). Nov 14 11:36:36
> palantir kernel: [10330.783164] atkbd.c: Use 'setkeycodes 28
> <keycode>' to make it known. Nov 14 11:36:37 palantir kernel:
> [10330.855664] atkbd.c: Unknown key pressed (raw set 2, code 0x128 on
> isa0060/serio0). Nov 14 11:36:37 palantir kernel: [10330.855676]
> atkbd.c: Use 'setkeycodes 28 <keycode>' to make it known
> 
> I have invested this, and one difference I notice in log/messages
> during resume activity is this:
> 
> WITHOUT system password required:
> input: AT Translated Set 2 keyboard
> as /devices/platform/i8042/serio0/input/input1
> 
> WITH system password required:
> input: AT Raw Set 2 keyboard
> as /devices/platform/i8042/serio16/input/input45
> 
> Now, investigating further, I have found that I can replicate this
> whole issue with this script:
> 
> #!/bin/sh
> echo -n "i8042" > /sys/bus/platform/drivers/i8042/unbind
> sleep 5;
> echo -n "i8042" > /sys/bus/platform/drivers/i8042/bind
> 
> if I hit a key during the sleep stage, the keyboard et al all goes
> AWOL again.
> 
> So, I am presuming here that when my laptop gets woken up, the BIOS
> system password screen comes, and the /etc/acpi/resume.d/ scripts are
> being held in stasis until I enter the password.  BUT, I have then
> used the keyboard before i8042 is echoed to 'bind', and this causes
> the issue.  Without the system password set, the scipts perhaps run
> fast enough before I can hit the keyboard in this keyboard state.
> 
> One reference I found with similar problem:
> 
> http://kerneltrap.org/mailarchive/linux-kernel/2008/5/13/1805874

Forgot!

I am running Ubuntu 8.10 base, with hand built 2.6.27.5 kernel.

BTW, this issue also happens in plain console with no X running.

> Thanks,
> 
> Nick
> 


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