From: rich@example.invalid   
      
   S.K.R. de Jong  wrote:   
   > On Thu, 30 Sep 2021 13:32:49 +0100, Mike wrote:   
   >   
   >> In article , Rich     
   >> wrote:   
   >>   
   >>>>>> ... whether or not the monitor is turned on?   
   >>   
   >>>> Maybe this is only querying whether the computer thinks the   
   >>>> monitor should be active/blanked/part sleeped/deep sleeped, rather   
   >>>> than interrogating the monitor to find if the power is on.   
   >>>   
   >>>What it tells you is whether X has used the DPMS signalling to   
   >>>instruct the monitor to turn itself off.   
   >>>   
   >>>If you are looking for it being physically turned on/off, then this   
   >>>method will not help detect that fact.   
   >>   
   >> So that very much depends on whether the OP *actually* wants to know   
   >> :-   
   >>   
   >> "whether or not the monitor is turned on?" meaning at the power   
   >> switch, or   
   >>   
   >> "whether or not the computer last told the monitor to ..." which is   
   >> a different question.   
   >   
   >        The first one: I would like to know whether the monitor is   
   > physically turned on - i.e.  plugged into the electric outlet and   
   > with the power button in the on position.   
   >   
   >        Can this be done from Slackware?   
      
   I feel that this request is not possible from any OS without you first   
   building the sensors and computer interface necessary to read those   
   sensors from the attached PC.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)