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

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Date:	Fri, 22 Feb 2008 08:50:04 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Jesse Barnes <jesse.barnes@...el.com>,
	Romano Giannetti <romano@....icai.upcomillas.es>,
	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, 22 Feb 2008, Ingo Molnar wrote:
> 
> btw., why isnt there an in-kernel whitelist, with perhaps a dynamic, 
> convenient /debug/s2r/whitelist append-API for distros (and testers) to 
> add more entries to the whitelist/blacklist? (for cases where the kernel 
> whitelist has not caught up yet) Which would eventually converge to 
> Utopia: s2ram that just works out of box.

The big problem with that is
 - the people who know about the devices are usually not kernel people
 - the workarounds that the whitelist requires is quite often not a kernel 
   workaround.

In other words, the most common workarounds for the s2ram whitelist is 
usually to do things like running vbetool in user-level to do VGA register 
save/restore (VBE_POST and VGE_SAVE). Sure, the kernel could do that with 
usermodehelper etc, but s2ram also has those things as command line flags 
etc, so...

		Linus
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