API to turn off the display

[M. Warner Losh]

In message: <20040128045816.Y1089 at alpha.siliconlandmark.com>
            Andre Guibert de Bruet <andy at siliconlandmark.com> writes:
: 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().

My experience is that turning the display off via apm doesn't work on
many laptops :-(.

Warner