[mythtvnz] Hardware Recommendations

[David Moore]

On 05/10/11 17:35, Jason Taylor wrote:
>     Some people like to leave their systems on 24/7 but I like to save the
>     planet :) so I have mine set up to power down after I log off and power
>     up again when myth needs to record something.
>
>
> I've never manager to get this working as I'd like.. basically if its
> after say 10pm and nothing is /being recorded or played/ I'd like the
> machine to shutdown and then always wake up at say 8am (or earlier if
> required for a recording).. this would save 10 hours of ontime a day and
> keep the mrs happy about having to start the machine...
>
> I should really have another attempt at it... it would be quite a power
> saving...
>
It wasn't too hard once I got my head around UTC vs NZ time zone stuff. 
I started with this web page:

http://www.mythtv.org/wiki/ACPI_Wakeup

Then I modified the setwakeup.sh script to suit my system and always 
wake at 6 pm (or earlier if needed to record) and power down at or after 
10:30 pm if nobody is logged in. Here's the script I'm using now:

---------------------------------------------------------------
#!/bin/sh
#
# set ACPI Wakeup time
# usage: setwakeup.sh seconds
#    seconds - number of seconds from epoch to UTC time (time_t time format)
#
# set UTCBIOS to true if bios is using UTC time
# set UTCBIOS to false if bios is using local time

UTCBIOS=false

ONTIME=`date -u --date "\`date --date 'TZ="Pacific/Auckland" 6:00 pm 
today' +%F" "%T\`" +%s`
ONNEXT=`date -u --date "\`date --date 'TZ="Pacific/Auckland" 6:00 pm 
tomorrow' +%F" "%T\`" +%s`
OFFTIME=`date -u --date "\`date --date 'TZ="Pacific/Auckland" 10:30 pm 
today' +%F" "%T\`" +%s`
NOW=`date -u --date "\`date +%F" "%T\`" +%s`

echo $ONTIME
echo $OFFTIME
echo $ONNEXT
echo $NOW

if $UTCBIOS
then
     #utc bios - use supplied seconds
     SECS=$1
else
     #non utc bios - convert supplied seconds to seconds from
     #epoch to local time
     SECS=`date -u --date "\`date --date @$1 +%F" "%T\`" +%s`

echo $SECS

     if [ $NOW -lt $ONTIME ]; then
         if [ $SECS -gt $ONTIME ]; then
             SECS=$ONTIME
             echo "on time "$SECS
         fi
     else
         if [ $SECS -gt $ONNEXT ]; then
             SECS=$ONNEXT
             echo "on next "$SECS
         fi
     fi
fi

echo 0 > /sys/class/rtc/rtc0/wakealarm         #this clears your alarm.
echo $SECS > /sys/class/rtc/rtc0/wakealarm     #this writes your alarm

cat /proc/driver/rtc #check if alarm set
---------------------------------------------------------------

Here's my checklogin.sh script:

---------------------------------------------------------------
#!/bin/bash
# Check to see if anyone is currently logged in. Return zero if not and 
1 if so.
# Echoed text appears in log file. It can be removed and --quiet added 
to the
# grep command once you are satisfied that mythTV is working properly

ONTIME=`date --date "6:00 pm today" +%s`
OFFTIME=`date --date "10:30 pm today" +%s`
NOW=`date +%s`

#DATE=`date +%F\ %T\.%N`
#DATE=${DATE:0:23}
if
   # The leading space is important!
   w | grep --quiet " 0 users"
   then
#    echo $DATE Noone is logged in, ok to shut down.
     if [ $NOW -ge $OFFTIME -o $NOW -lt $ONTIME ]; then
       exit 0
     else
       exit 1
     fi
   else
#    echo $DATE Someone is still logged in, don\'t shut down!
     exit 1
fi
---------------------------------------------------------------