linux-kernel - Re: 2.6.25-rc2 System no longer powers off after suspend-to-disk. Screen becomes green.

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Message-ID: <alpine.LFD.1.00.0802200922590.7833@woody.linux-foundation.org>
Date:	Wed, 20 Feb 2008 09:28:54 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jeff Chua <jeff.chua.linux@...il.com>
cc:	Jesse Barnes <jesse.barnes@...el.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Dave Airlie <airlied@...ux.ie>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-acpi@...r.kernel.org,
	suspend-devel List <suspend-devel@...ts.sourceforge.net>,
	Greg KH <gregkh@...e.de>
Subject: Re: 2.6.25-rc2 System no longer powers off after suspend-to-disk.
 Screen becomes green.

On Thu, 21 Feb 2008, Jeff Chua wrote:
> 
> After inserting "return 0;" right at the top of those two functions, suspend
> (and power-off properly), and resume (without green screen) works just fine.
> 
> I would like to know what they're for.

Try suspend-and-resume without X.

Also, try it on one of the more modern laptops - even *with* X.

Basically, the kernel wants to be able to do what X does, because it means 
that when it works, it works _so_ much better than doing it in X. So 
getting it working is definitely worth it.

That said, before you do anything else, try if suspend-to-RAM works. 

That's the primary goal for this code anyway, and if it works that gives a 
good hint. Suspend-to-disk is fundamentally different, and it's entirely 
possible that for the suspend-to-disk case we should just say "screw 
trying to suspend/resume graphics", since you'll have the BIOS resuming 
text-mode anyway, and there are no performance or debugging advantages.

		Linus
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