linux-kernel - Re: [BISECTED] EEE PC hangs when booting off battery

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Date:	Tue, 14 Apr 2009 08:17:28 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Alan Jenkins <alan-jenkins@...fmail.co.uk>,
	linux-acpi@...r.kernel.org,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Subject: Re: [BISECTED] EEE PC hangs when booting off battery

On Tue, 14 Apr 2009 08:59:01 -0600
Bjorn Helgaas <bjorn.helgaas@...com> wrote:

> I can't help with the real problem of why the asynchronous battery
> init causes the hang.

that got fixed already for the module case.

> 
> But I do object to the magic makefile ordering change in that commit.
> Nobody reading the makefile can tell why battery is down at the end,
> and moving it apparently slows down boot significantly. 

for all cases I've seen it actually speeds it up, because the battery
now runs concurrently with the disk probe.

> So the
> ordering change just feels like a band-aid that covers up a place
> where ACPI could be improved.

the reason for the move is that both the battery and other pieces take
the big acpi lock; which defeats the parallelism. So the battery needs
to happen at the end instead.

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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