[NTLUG:Discuss] Monitor shutdown

[Kenneth Loafman]

Go grab the sources for the drivers you use and you should be able to
find documentation.  All of this has been Reverse Engineered somewhere,
otherwise it would not be in Linux.

...Ken

Dan Carlson wrote:
> 
> Monitor power management is performed according to the VESA DPMS (Display
> Power Management Specification) spec.  Most VESA specs are not free, and
> this one is no exception.
> 
> If you have a fully compliant VESA BIOS, you can perform monitor power
> management with BIOS calls, which are specified in the VBE/PM (VESA BIOS
> Extensions / Power Management) spec, also not free.
> 
> There is no additional data channel defined for DPMS (at least, the last
> time I looked).  The information on which power state the monitor should be
> in is passed from the host to the monitor using the video horizontal and
> vertical sync signals:
> 
> On:  Both Horizontal and veritical sync pulses present.
> Standby:  Horizontal pulses absent, Vertical pulses present.
> Suspend:  Horizontal pulses present, Vertical pulses absent.
> Off:  Both Horizontal and Vertical pulses absent.
> 
> If you have access to the display driver (X server, console frame buffer
> driver, etc.) and you have technical documentation on the display
> controller's CRT controller register set, then you have direct control over
> the sync signals to put the monitor in the state you want it in.
> 
> Pulses for horizontal sync are defined as being present at greater than 10
> KHz frequency.
> 
> Pulses for vertical sync are defined as being present at greater than 40 Hz
> frequency.
> 
> So you don't have to drop the sync frequencies to zero, just below the
> thresholds.  This is probably a concession to some CRT controllers that
> can't be programmed down to zero.
> 
> Dan Carlson
> 
> ----- Original Message -----
> From: "Vaidya, Harshal (Cognizant)" <HarshalV at pun.COGNIZANT.COM>
> To: <discuss at ntlug.org>
> Sent: Sunday, August 04, 2002 11:27 PM
> Subject: [NTLUG:Discuss] Monitor shutdown
> 
> > Hi,
> >   Is there any way to shut down a computer monitor programmatically..
> > locally or remotely?
> >
> > Regards,
> > Harshal.
> >
> >
> 
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