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    SubjectRe: [rtc-linux] Re: rtc_cmos: error after first write to wakealarm
    On Fri, Jun 22, 2007 at 11:45:52 -0700, David Brownell wrote:
    > On Friday 22 June 2007, Alessandro Zummo wrote:
    > > On Tue, 19 Jun 2007 19:24:29 +0200
    > > Tino Keitel <tino.keitel@gmx.de> wrote:
    > >
    > > > > > Where is the documentation that describes that I have to disable it
    > > > > > first, and how to do this? A migration document for
    > > > > > /proc/acpi/alarm users would be nice, too.
    > > > >
    > > > > Well, I guess there is no documentation. Maybe we could add
    > > > > a dev_warn with an explicit message.
    > > >
    > > > Isn't it somewhat ridiculous to plan the removal of a feature for
    > > > several months, and then replace it with something that behaves
    > > > differently without any documentation?
    >
    > It's got as much documentation in the kernel tree as that
    > old /proc/acpi/alarm thing. More, in fact, since the GIT
    > comment for the putback creating /sys/rtc/.../wakealarm
    > files has lots of info about how to use it.

    What GIT comment are you referring to?

    >
    > But sure, having documentation for the rtc sysfs interface
    > would be a Fine Thing. It should cover the other values
    > too, not just that one attribute.
    >
    >
    > > > I still wonder how 'cat /sys/class/rtc/rtcX/wakealarm' is expected to
    > > > behave. With 2.6.22-rc5, I get this:
    > > >
    > > > $ echo 1182351177 > /sys/class/rtc/rtc0/wakealarm
    > > > $ cat /sys/class/rtc/rtc0/wakealarm
    > > > 2051644873
    > > >
    > > > There seems to be a constant difference of 869984896 seconds. Is this a
    > > > bug?
    >
    > What RTC driver is that using?

    rtc_cmos

    >
    > One theory: it's an RTC that doesn't support all the fields,
    > so its driver is returning "-1" in fields like "year" or "month".

    With the old /proc/acpi/alarm, the year 2007 became 0007. Maybe this is
    the culprit?

    Regards,
    Tino
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