From: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>
To: Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
Cc: yauh-acpi-CDzBh2wLF5MAvxtiuMwx3w@public.gmane.org,
acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: ACPI S3 suspend and LCD backlight
Date: Wed, 16 Nov 2005 22:02:49 +0100 [thread overview]
Message-ID: <20051116210249.GA12561@elf.ucw.cz> (raw)
In-Reply-To: <20051114131728.GA22957-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
Hi!
> > It appears something in the ACPI suspend code turns on the
> > LCD backlight to print out the diagnostic messages. Is there any
> > way to prevent this? Alternatively, is there a place in the drive
> > I can add a sequence to turn off the display just before it goes
> > to sleep?
>
> No, the ACPI suspend code doesn't do this (as far as I can tell). If you
> suspend from X, the kernel will switch away from X and X will restore
> the console state - which probably includes switching the backlight back
> on.
ACPI does switch consoles, which may cause something like that... see
kernel/power/console.c .
Pavel
--
Thanks, Sharp!
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prev parent reply other threads:[~2005-11-16 21:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-13 5:39 ACPI S3 suspend and LCD backlight yauh-acpi-CDzBh2wLF5MAvxtiuMwx3w
[not found] ` <200511130639.jAD6d42Y011608-MVZ+8Rc8O2bWg2f883+pGFGJXeKZcw9A@public.gmane.org>
2005-11-14 13:17 ` Matthew Garrett
[not found] ` <20051114131728.GA22957-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2005-11-16 21:02 ` Pavel Machek [this message]
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