Re: API to turn off the display
From: Taku YAMAMOTO (taku_at_cent.saitama-u.ac.jp)
Date: 01/28/04
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Date: Thu, 29 Jan 2004 06:07:27 +0900 To: freebsd-current@freebsd.org
Greetings,
On Wed, 28 Jan 2004 13:19:02 -0500
John Baldwin <jhb@FreeBSD.org> wrote:
> On Wednesday 28 January 2004 01:11 pm, Scott Lambert wrote:
> > On Wed, Jan 28, 2004 at 08:32:15AM -0700, M. Warner Losh wrote:
> > > In message: <20040128045816.Y1089@alpha.siliconlandmark.com>
> > >
> > > Andre Guibert de Bruet <andy@siliconlandmark.com> writes:
> > > : Through functionality provided by the BIOS. A 30-second
> > > : search through the source would have shown the answer in
> > > : /usr/src/sys/i386/bios/apm.c:334 with apm_display().
> > >
> > > My experience is that turning the display off via apm doesn't work on
> > > many laptops :-(.
> >
> > Is there anything that does; other than closing the lid?
>
> Yes, there should be. ACPI has an entire set of methods devoted to manging
> displays including turning the displays on and off. We just don't support
> those yet.
I wrote a driver that handles what John told.
http://access.cent.saitama-u.ac.jp/~taku/freebsd/acpi_vid-20031013.tar.gz
MD5 (acpi_vid-20031013.tar.gz) = adbfa6931e505544fb784e00c7b974e7
This driver uses ACPI video extension to control display switching and
backlight brightness. So working ACPI is a requisition for this driver.
Whether it does or does not work depends heavily on how well the BIOS written,
however, I hope it worth trying.
Suggestions, working/not-working reports etc are very appreciated.
Sincerely,
taku
-- -|-__ YAMAMOTO, Taku <taku@cent.saitama-u.ac.jp> | __ < Post Scriptum: Due to recent instability of our campus network, downloading may fail. Please try several times before giving it up if things didn't go well. Sorry for inconvinience. _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
- Previous message: Robert Watson: "Re: system call performance 4.x vs 5.x [and UP vs MP]"
- In reply to: John Baldwin: "Re: API to turn off the display"
- Next in thread: Julian Elischer: "Re: API to turn off the display"
- Reply: Julian Elischer: "Re: API to turn off the display"
- Reply: Stijn Hoop: "Re: API to turn off the display"
- Reply: Anish Mistry: "Re: API to turn off the display"
- Reply: Josh Elsasser: "Re: API to turn off the display"
- Reply: James Green: "Re: API to turn off the display"
- Reply: Julian Elischer: "Re: API to turn off the display"
- Reply: Melvyn Sopacua: "Re: API to turn off the display"
- Reply: Mark Santcroos: "Re: API to turn off the display"
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