linux-kernel - Re: [BUG] 2.6.28 hates my RTC clock

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Message-ID: <20090105143338.GA32337@srcf.ucam.org>
Date:	Mon, 5 Jan 2009 14:33:38 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Jike Song <albcamus@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] 2.6.28 hates my RTC clock - with PM_TRACE set

On Mon, Jan 05, 2009 at 10:19:22PM +0800, Jike Song wrote:

> As usually, it suspended to RAM successfully.  But after I press the
> power button, it won't come back, giving me nothing but a black
> screen.  So I hold the power button done for about 5 seconds, then the
> computer halted(it's only a hardware feature of the southbridge,
> right? ;-), silently, without any output on the always-black screen.
> 
> So the PM_TRACE code was broken, right?

Why do you say that?

> After rebooting the computer, I found I was in the year 1988!  And I
> do the suspend-hold_power_button-reboot once again, now it is 2040
> years A.D.

PM_TRACE uses the clock registers to store information about which 
device the kernel was attempting to resume when it hung. It's expected 
that your clock will be wrong afterwards.

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