MarcDouglas

mRandr is a small utility with limited use for those with multiple monitors and exactly HDMI, DVI, DisplayPort as options, using a arandr generated script, it can set the monitors that change numbers after boot.

Useful Procs

proc sleep {time} {
   after $time set end 1
   vwait end
}

proc timestamp { } {
                return "\[[clock format [clock seconds] -format {%m/%d %H:%M:%S}]\] "
}

Raspberry Pi - HDMI off/on with xscreensaver

I simply run this in my ~/.profile. I use this simple bash script to launch it wherever I keep it.

#!/bin/bash
#/home/marc/bin/xsaver_turn_Off_HDMI_pi
cd /speedy/spark/xsaver_turnOffHDMI_pi/
tclsh main.tcl

#/speedy/spark/xsaver_turnOffHDMI_pi/main.tcl
set debug FALSE
set verbose FALSE

proc verbose:puts { args } {
        if {$::verbose} {
                puts {*}$args
        }
}

proc debug:puts { args } {
        if {$::debug} {
                puts {*}$args
        }        
}

proc cmd:run { args } {
        set cmd [eval concat $args]
        if { [catch {open |$cmd r+} pipe] } {
                verbose:puts "cmd:run\[$pipe\]<<ERROR \[$::errorCode\]"
        } else {
                verbose:puts "cmd:run\[$pipe\]>>\[$cmd\]"
                fconfigure $pipe -buffering none -blocking 1
                fileevent  $pipe readable [list cmd:read   $pipe]
        }
}

proc cmd:read { pipe } {
        set chars [gets $pipe line]
        if { [eof $pipe] || $chars == -1} {
                fileevent $pipe readable {}
                if { [catch {close $pipe} code] } {
                         puts "cmd:read\[$pipe\]>>Error \[$::errorCode\] $code"
                } else {
                         debug:puts "cmd:read\[$pipe\]>>pipe closed."
                }
                set _(done) 1
                return
        } else {
                verbose:puts "cmd:read\[$pipe\]<<\[$line\] ($chars chars)"
        }
        
        if {[string first "BLANK" $line] == 0 } {
                puts "cmd:read\[$pipe\]>>Turning off HDMI"
                cmd:run [list "/opt/vc/bin/tvservice" "-o"]
        } elseif {[string first "UNBLANK" $line] == 0 } {
                puts "cmd:read\[$pipe\]>>Turning on HDMI"
                cmd:run [list "/opt/vc/bin/tvservice" "-p"]
        }


}

cmd:run "xscreensaver-command -watch"
vwait forever