From: Len Brown <lenb@kernel.org>
To: Zhao Forrest <forrest.zhao@gmail.com>
Cc: linux-acpi@vger.kernel.org
Subject: Re: Any difference between disabling ACPI in BIOS and acpi=off
Date: Tue, 6 Mar 2007 01:01:56 -0500 [thread overview]
Message-ID: <200703060101.56599.lenb@kernel.org> (raw)
In-Reply-To: <ac8af0be0703052156y76e15dbqf4e6683695b5ae07@mail.gmail.com>
On Tuesday 06 March 2007 00:56, Zhao Forrest wrote:
> Hi,
>
> For RHEL4-U4-64bit, we can boot up kernel with ACPI enabled in BIOS
> whether we add the kernel parameter "acpi=off" or not; however kernel
> can't boot with ACPI disabled in BIOS whether we add kernel parameter
> "acpi=off" or not.
>
> My question is, is there any difference between disabling ACPI in BIOS
> and acpi=off from the kernel's point of view?
There shouldn't be.
However, it may be that the BIOS is doing something stupid when
disabling ACPI, such as mucking up e820 -- which is technically
part of ACPI, but Linux uses it in both ACPI and legacy mode.
if you have the "debug" console log from the failed boot,
that may give a clue.
-Len
prev parent reply other threads:[~2007-03-06 6:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-06 5:56 Any difference between disabling ACPI in BIOS and acpi=off Zhao Forrest
2007-03-06 6:01 ` Len Brown [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200703060101.56599.lenb@kernel.org \
--to=lenb@kernel.org \
--cc=forrest.zhao@gmail.com \
--cc=linux-acpi@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.