linux-kernel - [regression] Re: [ 049/149] rtc: Disable the alarm in the hardware (v2)

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Date:	Mon, 5 Nov 2012 01:11:18 -0800
From:	Jonathan Nieder <jrnieder@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, John Stultz <john.stultz@...aro.org>,
	Rabin Vincent <rabin.vincent@...ricsson.com>,
	Janne Boman <janne.m.boman@...il.com>,
	Heinz Wiesinger <HMWiesinger@....at>,
	rtc-linux@...glegroups.com
Subject: [regression] Re: [ 049/149] rtc: Disable the alarm in the hardware
 (v2)

Hi,

In March, Greg KH wrote:

> 3.2-stable review patch.  If anyone has any objections, please let me know.

Sorry, I'm a little late.  This seems to be causing spurious wakeups
after shutdown on some systems just like v1 did. :/

Janne Boman reports[1], using an HP EliteBook 8530w:

| I'm unable to shutdown my system via normal means. The system
| completes the shutdown process, all hardware lights are off, but then
| somehow it restarts.

Based on a quick web search, Heinz Wiesinger, using the same model,
ran into the same problem and bisected it to this patch:

  https://bugzilla.kernel.org/show_bug.cgi?id=44261

Janne confirmed the same by testing kernels closely based on 3.2.13
and 3.2.14 --- 3.2.13 shut down fine, while on 3.2.14 "shutdown -h
now" behaved roughly speaking like "reboot".  A kernel close to 3.6.4
was also affected.

Known problem?  An acpidump and kernel log can be found at [2].

Looking forward to your thoughts,
Jonathan

[1] http://bugs.debian.org/691902
[2] http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=78;bug=691902
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