linux-kernel - Re: tsc breaks atkbd suspend

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Message-ID: <alpine.LFD.1.00.0802191748110.7583@apollo.tec.linutronix.de>
Date:	Tue, 19 Feb 2008 17:51:01 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	jbohac@...e.cz, kernel list <linux-kernel@...r.kernel.org>,
	jikos@...e.cz, "Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...l.org>
Subject: Re: tsc breaks atkbd suspend

On Tue, 19 Feb 2008, Ingo Molnar wrote:
> * Pavel Machek <pavel@....cz> wrote:
> 
> > TSC is used even on machines when CONFIG_X86_TSC is not set (X86_TSC 
> > means _require_ TSC), but it is not properly disabled when it is 
> > unusable, because acpi code understood the config switch as "may use 
> > TSC".
> > 
> > This actually fixes suspend problems on my x60.
> 
> ah! This makes tons of sense. I've applied your patch - but i guess it 
> should go via the ACPI tree.

Right. The breakage was introduced there when IA64 switched to
GENERIC_TIME and the X86_TSC dependency was added.

Thanks,

	tglx
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