Date: Mon, 6 Sep 2010 12:45:20 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Andriy Gapon <avg@icyb.net.ua> Cc: freebsd-acpi@freebsd.org Subject: Re: kern/73823: [request] acpi / power-on by timer support Message-ID: <20100906094520.GA2396@deviant.kiev.zoral.com.ua> In-Reply-To: <201009060720.o867KHOh046381@freefall.freebsd.org> References: <201009060720.o867KHOh046381@freefall.freebsd.org>
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--GVAJC8kVsxM61ApF Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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. >=20 > From: Andriy Gapon <avg@icyb.net.ua> > To: AW <arne_woerner@yahoo.com> > Cc: bug-followup@FreeBSD.org, Bruce Cran <brucec@FreeBSD.org> > Subject: Re: kern/73823: [request] acpi / power-on by timer support > Date: Mon, 06 Sep 2010 10:14:45 +0300 >=20 > 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... > >=20 > >> 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... > >=20 > > Maybe i used a different/buggy BIOS when I found the problem? > > Maybe Linux couldnt do it, too...? > >=20 > > 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... > =20 > 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 no= rmal boot. > =20 > BTW, an interesting page: > http://www.mythtv.org/wiki/ACPI_Wakeup > It mentions that BIOS would disable wake up if hardware clock is modifie= d 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. --GVAJC8kVsxM61ApF Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (FreeBSD) iEYEARECAAYFAkyEuDAACgkQC3+MBN1Mb4jM9wCgzpr6dS8b8VZF/Ov4IJDlhpz3 1uAAn2VNim0XREqroQkjLvIoYI2M8j+c =xpEN -----END PGP SIGNATURE----- --GVAJC8kVsxM61ApF--
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