API to turn off the display

[Andre Guibert de Bruet]

On Wed, 28 Jan 2004, Melvyn Sopacua wrote:

> On Wednesday 28 January 2004 05:07, Seth Chandler wrote:
> > >
> > >currently closing the lid doesn't properly turn off the display (when
> > > running X it gets to console mode, but doesn't turn off completely).
> > >
> > >I'd like to get tackle this by hooking into devd until this hopefully is
> > >resolved, but cannot find any information on a userland utility or system
> > > API for the vga/syscons/screen drivers to accomplish that.
> > >
> > >Is there such a thing?
> > It really depends on the video card you're using.  If your laptop has a
> > radeon, i suggest checking out radeontool from
> >
> > http://fdd.com/software/radeon/
>
> Nope, I have an nvidia GeForce 4200Go. Is there really no generic hook for a
> videocard/monitor to suspend/poweroff? How did apm handle this?

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().

Regards

> Andre Guibert de Bruet | Enterprise Software Consultant >
> Silicon Landmark, LLC. | http://siliconlandmark.com/    >