Re: API to turn off the display

From: Anish Mistry (mistry.7_at_osu.edu)
Date: 01/29/04

  • Next message: Josh Elsasser: "Re: API to turn off the display" 
    To: Taku YAMAMOTO <taku@cent.saitama-u.ac.jp>
Date: Wed, 28 Jan 2004 20:00:08 -0500

    On Wednesday 28 January 2004 04:07 pm, Taku YAMAMOTO wrote:
    ...
    >
    > 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.
    >
    It attaches and detects the displays:
    littleguy# sysctl hw.acpi.video
    hw.acpi.video.crt0.active: 0
    hw.acpi.video.lcd0.active: 1
    hw.acpi.video.tv0.active: 0

    But trying to turn off the LCD doesn't work:
    littleguy# sysctl hw.acpi.video.lcd0.active=0
    hw.acpi.video.lcd0.active: 1 -> 1

    Tried to connect the tvout and activate it, but the sysctl showed 0, even
    though it was displaying to the TV. Twiddling this sysctl while the tv
    out was active yielded the same results as the lcd, except it stayed at 0.

    My laptop's asl:
    http://am-productions.biz/debug/littleguy.asl

    I'd be happy to do more testing. 

    -- 
Anish Mistry

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