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* [email protected] <[email protected]> [2001-04-17 16:33+0200]
> I plan to add more features in the future, like allowing change of the
> brightness value safely while this daemon is running (currently, there may
> be race conditions if you want to run another program accessing the same
> part of the BIOS, like the small program that just sets the brightness).
> Automatic change when more power is used on DC (like when the fan is
> starting)

This should be the job of apmd. apmd's job is to monitor APM events
and to do stuff when things happen. From apmd(8):

      Most uses of this daemon will use  the  proxy  command  to
      support  power  conservation  activities.  This command is
      searched for by default in /etc/apmd_proxy and is  invoked
      with one or two arguments:
 [..]
      change power
             This  presents  a  subset  of the APM driver "power
             change" events, specifically those where  AC  power
             was  added  or removed.  This will often modify the
             system wide power policy; for example, so that  IDE
             hard  drives  aggressively  enter standby mode when
             only battery power is available.

You just need to call a program to change the brightness (a strip down
version of your program is attached) and to make the apmd proxy run
the appropriate script in /etc/apm/events.d (attached too).

Here's the catch though: it doesn't work on my Vaio. :-)

It seems that the apmd doesn't receive any event (except "Event
0xad03: Unknown") when the power status changes. I am not that
surprised, because the remaining time indicator is broken too (see
[1]). Maybe it will work on others though...

 1. http://larve.net/people/hugo/2000/07/linux-vaio#apm
--
Hugo Haas <[email protected]> - http://larve.net/people/hugo/
Done and done.

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#define DEV_EC0_DATA_REG 0x62
#define DEV_EC0_CST_REG  0x66

#include <stdio.h>
#include <stdlib.h>
#include <sys/io.h>
#include <sys/types.h>
#include <unistd.h>

void ecr_set8(u_int8_t addr, u_int8_t value) {
while (inb(DEV_EC0_CST_REG) & 3) usleep(1);
outb(0x81, DEV_EC0_CST_REG);
while (inb(DEV_EC0_CST_REG) & 2) usleep(1);
outb(addr, DEV_EC0_DATA_REG);
while (inb(DEV_EC0_CST_REG) & 2) usleep(1);
outb(value, DEV_EC0_DATA_REG);
while (inb(DEV_EC0_CST_REG) & 2) usleep(1);
}

int main (int argc, char **argv) {
 u_int8_t bright;

 if (argc == 2) {
   bright = atoi(argv[1]) & 0xFF;
 } else {
   printf("Usage: %s brightness_value\n", argv[0]);
   return(1);
 }

 iopl(3);
 ecr_set8(0x96, bright);
 return(0);
}

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#!/bin/sh

if [ "$1" != "change" ]; then
 exit 0
fi

if [ "$2" != "power" ]; then
 exit 0
fi

if on_ac_power >/dev/null; then
 /usr/local/sbin/brightness 0
else
 /usr/local/sbin/brightness 100
fi

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