linux-kernel - Re: [PATCH 6/7] pm: Config option to disable handling of console during suspend/resume

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Date:	Thu, 7 Aug 2008 23:43:07 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ben Collins <ben.collins@...onical.com>
Cc:	Pavel Machek <pavel@...e.cz>, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH 6/7] pm: Config option to disable handling of console during suspend/resume

On Thursday, 7 of August 2008, Ben Collins wrote:
> On Mon, 2008-08-04 at 08:28 +0200, Pavel Machek wrote:
> > Hi!
> > 
> > > > > diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> > > > > index e7bea3e..6a042f8 100644
> > > > > --- a/Documentation/kernel-parameters.txt
> > > > > +++ b/Documentation/kernel-parameters.txt
> > > > > @@ -2247,6 +2247,11 @@ and is between 256 and 4096 characters. It is defined in the file
> > > > >  	vmpoff=		[KNL,S390] Perform z/VM CP command after power off.
> > > > >  			Format: <command>
> > > > >  
> > > > > +	vt_switch=	[PM] Switch vt's during suspend/resume
> > > > > +			Format: { 0 | 1 }
> > > > > +			Default is normally '1', but depends on value of
> > > > > +			the PM_DISABLE_CONSOLE config option.
> > > > > +
> > > > 
> > > > Why a build time config option?  Why not just set the command line
> > > > option if you need this?  And/or make it a sysctrl?
> > > > 
> > > > That way we don't have to add yet-another-config-option for distros and
> > > > users to get wrong.
> > > > 
> > > > thanks,
> > > 
> > > Sysctl makes sense. I would rather not have to add a cmdline option to
> > > default installs (and on upgrades). I'll redo the patch that way and
> > > resend.
> > 
> > Maybe have acpi_sleep=no_vt_switch? THat is already settable from
> > userspace...?
> 
> Where is this setting?

This is a command line option + sysctl, but it won't be sufficient, IMO,
because it only is available on ACPI systems, while your sysctl should be
available on all systems that can suspend.

Thanks,
Rafael
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