[mythtv-users] How to setup wakeup from frontend?

[Jerry Rubinow]

On Mon, Aug 30, 2010 at 6:27 AM, Craig Huff <huffcslists at gmail.com> wrote:

> Jerry,
>
> I have a MBE/FE + 2 remote FEs set up the way you discuss.  The BE
> does not (AFAIK) need to have an FE configured on it to use
> MythWelcome/Shutdown.  You _will_ need (even works through ssh tunnel
> x-forwarded) keyboard, mouse, and video to configure
> MythWelcome/Shutdown (unless you're better than me -- not hard -- and
> can do it with mysql commands).
>
> Here's what I do:
>
>  A) BE runs MythWelcome on startup -- if using MythBuntu this is
> simple: See notes in /etc/mythtv/session-settings.
>  B) BE runs with the appropriate options turned on in
> /proc/acpi/wakeup to allow ethernet wakeup to wake the system up.  I
> had to experiment with the options displayed by "cat
> /proc/acpi/wakeup" to find the right one -- seems to be different on
> each MOBO.  You might also need additional one(s) to enable waking via
> the RTC alarm so the BE will wake up to record shows.  I use a startup
> script in /etc/init.d/XXXXX && /etc/rc*.d/SnnXXXXX to make sure this
> is set each startup and shutdown (probably a belt and suspenders
> approach, but it works).
>  C) BE runs ethtool -s eth0 wol g to enable Wake-On-LAN (again using
> startup script)
>  D) Configure MythWelcome from it's pop-up dialogs invoked with 1)
> "i-key" and 2) "F11" key
>  E) Configure Shutdown from mythtv-settings
>
> Then configure (repeat for each separate remote FE):
>  A) FE to run MythWelcome
>  B) FE turns on options in /proc/acpi/wakeup
>  C) FE runs ethtool -s eth0 wol g to enable Wake-On-LAN (handy for
> remote maintenance from the BE or any other ssh-enabled system).
>  D) Configure MythWelcome (settings are defined per system so they
> can be different from one BE, BE/FE, FE to another)
>
> Don't need to repeat Shutdown config.  One size fits all, so consider
> the settings in that light.  I set shutdown delay long enough so a
> remote FE can use WOL to wake up the BE and have a chance to connect
> to mythbackend before it (the BE) decides it has waited long enough
> and shuts back down.  You also have to tell the FE (again via
> mythtv-setup) to wake up the mysql server (same as the BE for me)
> often enough and long enough so it is still trying when the BE gets up
> to speed and 1) is listening on the ethernet, and 2) has
> mythbackend/mysql running for the FE to connect to.
>
> Also, think about how long it takes your BE to wake up and be ready to
> record and dial the wake up lead time in mythtv-settings with some
> safety margin.
>
> I use ext3 partitions for my disk, so occasionally it wants to fsck
> them on boot up.  To prevent this from happening when it is booting up
> to record a show and delay the start of the recording I check to see
> if it is due soon and modify the end-of-recording-session shutdown to
> create the force-fsck flag file (don't remember it's name ATM) and do
> a shutdown -r instead of shutdown -h (or in my case hibernating) so it
> will come right back up, do the fsck, MythTV will time out again and
> shutdown for good.  This requires changing the shutdown command (IIRC
> it's in _both_ mythtv-setup -- for mythbackend to use -- and in
> MythWelcome -- for mythwelcome to use) to invoke a script I wrote
> which checks the fsck status, amongst other things, and takes
> appropriate action.
>
> Wrote this up quick, so if something doesn't make sense or it doesn't
> work for you, post back and I'll take more time later.
>
> HTH,
>
> Craig.
>

Craig,

That's great info, thanks.  A couple of questions:

1. Is there any reason for running mythwelcome on the backend if it is a
backend only, and not a combined BE/FE?
2. Does mythwelcome on the frontend just display "asleep" or something like
that as the backend status when the backend is off and mythfrontend is not
running?
3. It sounds like the "Enable Database Server Wakeup" setting on the
frontend configuration is where you put the wake-on-lan command to wake up
the backend.  Just want to verify this is the case.
4. Is it possible, in general, to wake up a sleeping computer via a USB IR
receiver?  Oh wait, never mind this one - just found it on the wiki.

Thanks,
Jerry
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