On Mon, Sep 06, 2010 at 07:20:17AM +0000, Andriy Gapon wrote: > The following reply was made to PR kern/73823; it has been noted by GNATS. > > From: Andriy Gapon <[email protected]> > To: AW <[email protected]> > Cc: [email protected], Bruce Cran <[email protected]> > Subject: Re: kern/73823: [request] acpi / power-on by timer support > Date: Mon, 06 Sep 2010 10:14:45 +0300 > > on 06/09/2010 09:54 AW said the following: > >> Can someone (Bruce?) explain to me in greater detail what this PR is > about? > >> > > I believed that the box can boot at the specified time if Linux powers it > down... > > and that it cant, if FreeBSD does it... > > > >> I thought that the functionality of turning power on at certain time > completely > >> belonged to BIOS. How is acpi(4) driver expected to help? > >> > > i dont know... maybe the power down procedure offers some flag > > (like "power down, but honor the BIOS settings about wake-up time" and > > "power down and ignore BIOS settings about wake-up time")? > > That LAN wake-up packet worked fine (WOL?) if FreeBSD powered the box > down... > > > > Maybe i used a different/buggy BIOS when I found the problem? > > Maybe Linux couldnt do it, too...? > > > > I dont use that box (mainboard: ECS K7VVM+ or so)/FreeBSD anymore, > > but it should be easy for u to test it on contemporary hardware... > > Well, I am not aware of any OS assistance or control over this. > If hardware and BIOS support this feature and it is properly configured, then > power-on happens entirely in hardware and for OS it looks just like a normal > boot. > > BTW, an interesting page: > http://www.mythtv.org/wiki/ACPI_Wakeup > It mentions that BIOS would disable wake up if hardware clock is modified > later. > We do that.
I think this is RTC wakeup event support. See, for instance, 4.7.2.4 Real Time Clock Alarm in ACPI 4.0 spec.
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