linux-kernel - Re: RTC_DRV_CMOS can break userspace interface

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Message-ID: <20070528003822.GA23759@srcf.ucam.org>
Date:	Mon, 28 May 2007 01:38:23 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Cc:	david-b@...bell.net
Subject: Re: RTC_DRV_CMOS can break userspace interface

On Mon, May 28, 2007 at 12:39:11AM +0100, Matthew Garrett wrote:

> but will disable /proc/acpi/wakeup. It'll also be impossible to load 
> CONFIG_RTC_CMOS because CONFIG_RTC has grabbed the io ports, so it's not 
> possible to use the new interface. This situation doesn't appear to be 
> documented, which is less than ideal...

Actually, it seems to be worse than that - the PNP entry for my cmos 
clock doesn't appear to mention an irq, so the wakealarm entry doesn't 
work. I can happily wake it using the /proc/acpi/alarm interface.

David, would you be happy with hardcoding the rtc-cmos IRQ to 8 on PCs 
if there's inadequate PNP information available?
-- 
Matthew Garrett | mjg59@...f.ucam.org
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