[mythtv-users] Carbon Footprint

[Roger Siddons]

On Wed, 28 Aug 2013 22:44:03 +0100, Daryl McDonald <darylangela at gmail.com>  
wrote:

>
>
>
> On Wed, Aug 28, 2013 at 4:56 PM, Karl Dietz  
> <dekarl at spaetfruehstuecken.org> wrote:
>> On 28.08.2013 22:33, Daryl McDonald wrote:
>>>    If I understand it correctly using UTC or not is a decision that is
>>>    mostly made depending on presence of other (Windows) operating  
>>> systems
>>>    dual-booting on the same hardware.
>>> I do have dual boot, so I should opt for RTC?

To repeat Chris/Karl: RTC is the BIOS clock - it can be set to use either  
UTC (Linux default) or localtime (Windows default). As previously, stated  
you can hack Windows to use UTC but it's probably simpler to keep it as  
localtime (which it seems to be at the moment). The important point is
to make Linux aware of this - your /etc/default/rcS should have:

# assume that the BIOS clock is set to UTC time (recommended)
UTC=no

The hwclock-save.conf script uses this to set the clock using localtime.

>>>
>>
>> according to the other mail you can choose to set your hardware clock
>> chip to:
>> * local wall clock time and add the conversion between UTC and local
>>   time to your MythTV shutdown script
>> * UTC without any calculations on the linux side, but needs a registry
>>   hack for windows (see Chris' mail, this option is new to me)
>>
>>
>>> I don't get the option for S5, just 1,2,3, or auto, and terminal output
>>> says I can wake from S4...more confusion
>>
>> S5 is what happens when you tell the computer to power off instead of
>> some kind of sleeping.
>>
>>
>>>      * your tuners support whichever power saving state you decide on  
>>> (do
>>>        they need special fiddling to come back to working state?)
>>>
>>> Don't know how to do that
>>
>> look for known issues with your selected hardware. Maybe on linuxtv or
>> search the internet for problems reported by others.
>
> Would my experience with powering off during nights when I know I'll be  
> up before the next recording indicate that my hardware is OK with >S5?

Yes. Regarding your S1/S2/S3/Auto: I suspect you're looking at the BIOS  
option for what to do when the system is suspended, ie. you briefly press  
the power switch. This is irrelevant. When these scripts shut Myth down it  
will turn itself off in the same way as you do manually (S5). The  
important point is that you set the BIOS to power up automatically at your  
alarm time via the RTC Alarm/Wakeup/whatever option.

The terminal S4 comment is also irrelevant. I'm guessing it's an  
informational message to distinguish your system from very old systems  
that didn't support S4. Also note that the link you're following (on a  
cursory reading) appears very similar to  
http://www.mythtv.org/wiki/ACPI_Wakeup, which has been around for years.

>>
>>
>>>      * MythTV likes whatever state you decide on. hint: full shutdown  
>>> is
>>>        known to work well :-)
>>>
>>> Don't know how to do this either
>>
>> follow bug reports and user discussion wrt hibernate etc. but plain old
>> turn off and on is known to work. I have no idea how the backend likes
>> it if the system time suddenly jumps ahead some hours/days.
>>
>>
>> I'd just try if the system comes back up when you set an alarm in
>> 5 minutes and shut down. If that doesn't work disable the update of the
>> hwclock on shutdown, see the howto you referred to. And only if that
>> does not work start looking into the other options.
>>
>>
>> Regards,
>> Karl
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
>> http://www.mythtv.org/mailman/listinfo/mythtv-user
>
> I'm thinking I'll toggle to auto, rather than S1,2,or3; should give me  
> the best shot for the first test anyway.
>
> Thanks, Daryl

Also, be aware that auto-wake will only work if Myth shut down the system.  
If you use your Windows OS (or a Linux desktop) then they will clear any  
RTC alarm when they shut down. You will have to re-boot into Myth  
afterwards and then shut it down to re-set the alarm and auto-wake for the  
next recording. It's easy to forget this and miss recordings...
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