API to turn off the display

Donn Miller dmmiller at cvzoom.net
Sat Jan 31 03:54:44 PST 2004

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.

I tried it.

Id Refs Address    Size     Name
  1   19 0xc0400000 3ac910   kernel
  2    1 0xc07ad000 5e60     vesa.ko
  3    1 0xc07b3000 cffc     if_dc.ko
  4    2 0xc07c0000 1a9c8    miibus.ko
  5    1 0xc07db000 9380     snd_maestro3.ko
  6    2 0xc07e5000 1f5c8    snd_pcm.ko
  7    2 0xc0805000 50f60    acpi.ko
  8    1 0xc2cc7000 b000     ntfs.ko
  9    1 0xc2d4b000 2000     apm_saver.ko
10    1 0xc2f55000 19000    linux.ko
11    1 0xc3133000 4000     acpi_vid.ko

sysctl hw.acpi.video
sysctl: unknown oid 'hw.acpi.video'

It doesn't detect the video at all on my laptop, i.e., I get no output 
from dmest or the kernel that anything was detected.

dmesg | grep -i vesa
Preloaded elf module "/boot/kernel/vesa.ko" at 0xc08571f4.
VESA: v2.0, 8192k memory, flags:0x0, mode table:0xc07b1ce2 (1000022)
VESA: S3 Incorporated. M7 BIOS

The laptop is an HP Pavilion N5440.

More information about the freebsd-current mailing list