Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!jarthur!nntp-server.caltech.edu!kanga!bchen
From: bchen@kanga.caltech.edu (Bing-Qing Chen)
Newsgroups: comp.sys.next
Subject: Re: Burn-in fears (Real or Imaginary ?), Prevention ?
Keywords: Burn-in, Monitors, Screen-saving, Insanity
Message-ID: <1991Feb22.193234.9619@nntp-server.caltech.edu>
Date: 22 Feb 91 19:32:34 GMT
References: <2171@fornax.UUCP>
Sender: news@nntp-server.caltech.edu
Organization: California Institute of Technology, Pasadena
Lines: 63
Nntp-Posting-Host: kanga

In article <2171@fornax.UUCP> oneill@fornax.UUCP (Richard O'Neill) writes:
>Some of our older NeXT machines have an after-image of the loginwindow
>burned into their display. Its faint, but noticeable. I don't know whether
>this was caused by behavour which is no longer exhibited by v2.0, but I have
>noticed that at our site, running v2.0, loginwindow screens stay at "normal
>intensity" for quite a while after logout before dimming to "reduced
>intensity". Is there some way to
>
>	a) Reduce the dimming time for the login window
 
 The following is a small program that will set the screen brightness to
0 when screen is auto-dimmed and restore to the previous brightness when
screen is reactivated. It will maintain a preset auto-dim time even when
loginwindow is running.

- Bing Chen
bchen@pooh.caltech.edu
--------------------------------------------------------
/*
 * Usage: screensaver <auto-dim minitues>
 * Run when logged into console or run by root
 */
#import <nextdev/evsio.h>
#import <libc.h>

void main( int argc, char **argv)
{
  int nb=0;
  int ob;
  int o_dim,c_dim;
  int ad_time=20400;
  int cad_time;
  int evs=open( "/dev/evs0", O_RDONLY);

  if ( evs == -1 ) {
    perror ("/dev/evs0");
    exit(10);
  }
  if ( argc == 2 ) 
    ad_time = atoi(argv[1])*4080;
  if ( ad_time < 4080 )
    ad_time = 4080;
  ioctl(evs, EVSIOSADT, &ad_time);
  ioctl(evs, EVSIOCADS, &o_dim);
  ioctl(evs, EVSIOCB, &ob);
  while (1) {
    sleep(1);
    ioctl(evs,EVSIOCADS,&c_dim);
    ioctl(evs,EVSIOCADT, &cad_time);
    if ( cad_time != ad_time ) 
      ioctl(evs, EVSIOSADT, &ad_time);
    if ( c_dim != o_dim ) {
      o_dim = c_dim;
      if ( c_dim ) {
	ioctl(evs, EVSIOCB, &ob);
	ioctl(evs, EVSIOSB, &nb);
      }
      else
	ioctl(evs, EVSIOSB, &ob);
    }
  }
  exit(0);
}


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