Lexmark Optra T Reference page 227

setquiet
setquiet —
integer
changes the user default setting of the PowerSave page device parameter.
The following integers are valid:
Power Saver Off
0
to or to
1 120 1
Number of minutes elapsed after last page prints before
Power Saver is invoked.
Any changes made by this operator are not active until the end of the print job.
Note: Some printer models released in the year 2000 or later designated as Energy
Star printers cannot have Power Saver disabled.
This operator is equivalent to executing the following PostScript emulation
sequence:
%Go into exitserver or startjob context
<< /PowerSave integer >> setpagedevice
Errors: rangecheck, stackunderflow, typecheck
4-59
(Model specific)
240
PostScript