Thinkpad not going off while suspend

[Kevin Oberman]

> Date: Sun, 10 Oct 2004 04:09:38 +0200
> From: Dennis Koegel <amf at hobbit.neveragain.de>
> Sender: owner-freebsd-mobile at freebsd.org
> 
> Hi,
> 
> On Sat, Oct 09, 2004 at 06:30:47PM -0700, Bruce M Simpson wrote:
> > > I just stumbled about something interesting, my Thinkpad t40 does
> > > not turn the display off (backlight is turned off) if going into
> > > suspend (acpi S3). If you point rather bright lamp at the lcd you
> > > can still read it.
> > You don't specify which OS version you're running. Have you tried
> > acpi_video?
> 
> Actually, I have the same problem. I was googling for it this
> afternoon and found references to acpi_video, but settting the
> video.lcd0.active sysctl to =0 would output "...lcd0.active: 1 -> 1"
> and consequently do nothing. LCD remains powered.
> 
> Found users reporting this problem, but no solution to it.
> 
> I'm running 5.3-BETA7 (cvsup'd yesteday).

Try adding:
hw.acpi.reset_video=0
hw.syscons.sc_no_suspend_vtswitch=1
to /etc/sysctl.conf. I think the latter will do the trick, but the
former was needed on my T30 to resume the display correctly.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634