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

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Message-ID: <66dc75180904111107q645fbb77i3cf927ffab7a7ef0@mail.gmail.com>
Date:	Sat, 11 Apr 2009 14:07:45 -0400
From:	Tzy-Jye Daniel Lin <ephemient@...il.com>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
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

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.
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