From: Boszormenyi Zoltan <zboszor@pr.hu>
Subject: S3 question
Date: Sun, 26 May 2013 13:36:27 +0200
Message-ID: <51A1F3BB.5070609@pr.hu>
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Sender: linux-acpi-owner@vger.kernel.org
To: linux-acpi@vger.kernel.org

Dear ACPI developers,

I have a question about S3 (Suspend To RAM) sleep.

Explicit warning: This mail mentions Windows XP. If you have heart prob=
lems, please skip=20
this mail entirely.

I am currently working with an Atom-based PC for embedded (POS) applica=
tion,
we use a custom modified Linux distribution.

The BIOS is setup in a way so the suspend mode is S3 and video Re-POST =
is
enabled when resuming from S3.

The vendor of the machine tests suspend/resume using Windows XP SP3.
The machine can suspend/resume properly under Linux as well but there i=
s
a big difference.

When resuming, the video is not re-POSTed under Windows XP but the
screen comes back just fine. When resuming under Linux, the first thing=
 that
appears on the screen are some lines in text mode indicating that video=
 re-POST
is happening. (A totally different screen from the screens at powerup.)

Does anyone know:
1. What XP is doing differently here?
2. Can the same sequence be also done under Linux? Maybe with a command=
 line
    option to control the way S3 is done?

Please, use reply-all, I am not subscribed to this mailing list.

Thanks in advance,
Zolt=E1n B=F6sz=F6rm=E9nyi

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