linux-kernel - Re: Regression: EEE PC hangs when booting off battery

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Date:	Sun, 12 Apr 2009 10:00:30 +0100
From:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
To:	Tzy-Jye Daniel Lin <ephemient@...il.com>
CC:	linux-acpi@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: Regression: EEE PC hangs when booting off battery

Tzy-Jye Daniel Lin wrote:
> On Sat, Apr 11, 2009 at 5:41 AM, Alan Jenkins
> <alan-jenkins@...fmail.co.uk> wrote:
>   
>> Regression #6 on latest git! (last known good is 2.6.29-rc8)
>>
>> Magic SysRQ keys work though.  Unfortunately, SysRq-W / SysRq-T generate
>> too much output, so the useful bits immediately scroll off the top of
>> the screen.  I can't press SysRq-P (even if that would help), because
>> the SysRQ key on my laptop is accessed using a Fn modifier key, which
>> also turns the left hand side of the keyboard into a numeric pad.
>>     
>
> I don't own an Eee, but having played with one, the key sequence
>
>     Alt down
>     Fn down
>     SysRq down, up
>     Fn up
>     P down, up
>     Alt up
>
> should work just fine.  As long as you keep holding Alt, you don't
> need to continue holding SysRq after the initial keypress.
>
>   
>> Magic SysRQs on my USB keyboard generate no response.  (Sometimes the
>> numlock key seems to work though.  I can't tell on the laptop keyboard
>> because the laptop doesn't have a numlock led).
>>     
>
> SysRq over USB has never worked.  On PC hardware, Magic SysRq depends
> on features of the built-in i8042 controller, which only handles PS/2
> input.
>   
Great, thanks a lot!

I was able to run SysRq-P, and found the following backtrace -

Pid: 0
EIP is at acpi_idle_enter_bm+0x1df/0x208 [processor]
cpud_idle_call
cpu_idle
rest_init
start_kernel
i386_start_kernel


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