linux-kernel - Re: [Suspend-devel] 2.6.25-rc2 System no longer powers off aftersuspend-to-disk. Screen becomes green.

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Message-ID: <20080222103727.GA25781@srcf.ucam.org>
Date:	Fri, 22 Feb 2008 10:37:29 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Jeff Chua <jeff.chua.linux@...il.com>
Cc:	Jesse Barnes <jesse.barnes@...el.com>,
	Romano Giannetti <romano@....icai.upcomillas.es>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	suspend-devel List <suspend-devel@...ts.sourceforge.net>,
	Dave Airlie <airlied@...ux.ie>, Greg KH <gregkh@...e.de>,
	lkml <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-acpi@...r.kernel.org
Subject: Re: [Suspend-devel] 2.6.25-rc2 System no longer powers off aftersuspend-to-disk. Screen becomes green.

On Fri, Feb 22, 2008 at 08:42:15AM +0800, Jeff Chua wrote:
> On Fri, Feb 22, 2008 at 8:23 AM, Jesse Barnes <jesse.barnes@...el.com> wrote:
> 
> >  Your system (either your distro suspend/resume scripts or your platform) must
> >  be running the video BIOS at resume time, otherwise it would probably come
> >  back blank.
> 
> But I don't think so, unless acpid is doing just that. In my
> suspend/resume event script, it's just doing a simple s2ram (without
> options), and exit after resume.

The s2ram command has a built-in whitelist used to set up video 
rePOSTing. If you want to test, reboot and do

echo mem >/sys/power/state

without i915 being loaded. If you get a console back on resume then the 
platform is reinitialising video for you, but otherwise it's your 
userspace.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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