linux-kernel - Re: ACPI: Idle Processor PM Improvements

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Message-ID: <20060912092100.GC19482@elf.ucw.cz>
Date:	Tue, 12 Sep 2006 11:21:00 +0200
From:	Pavel Machek <pavel@....cz>
To:	Jordan Crouse <jordan.crouse@....com>
Cc:	Jim Gettys <jg@...top.org>, "Brown, Len" <len.brown@...el.com>,
	Linux Kernel ML <linux-kernel@...r.kernel.org>,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	ACPI ML <linux-acpi@...r.kernel.org>,
	Adam Belay <abelay@...ell.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.com>, devel@...top.org,
	Bjorn Helgaas <bjorn.helgaas@...com>
Subject: Re: ACPI: Idle Processor PM Improvements

On Wed 2006-09-06 08:58:49, Jordan Crouse wrote:
> On 06/09/06 12:37 +0200, Pavel Machek wrote:
> > Hi!
> > 
> > > > 2.4 and 2.6 are *very* different here. You'll probably need to optimize freezer
> > > > in 2.6 a bit...
> > > > 						
> > > 
> > > Among other problems: e.g. 2.4 did not automatically do a VT switch; 2.6
> > > does; we'll have to have a way to signal "we're a sane display driver;
> > > don't switch away from me on suspend".
> > 
> > Not like that, please.
> > 
> > You are using X running over framebuffer, right? So that kernel is
> > controlling the graphics hardware. In such case it is safe to avoid VT
> > switch.
> 
> Actually not - the Geode GX has full 2D hardware acceleration with a complete
> X driver to match.  No Xfbdev here.

Ok, so what is needed is message to X "we are suspending", and X needs
to respond "okay, I'm ready, no need for console switch".

Alternatively, hack kernel to take control from X without actually
switching consoles. That should be possible even with current
interface.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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