[mythtv-users] OT: UPS

[Terjesen Jens Peder]

-----Original Message-----
On 23. februar 2012 4:23 Michael Watson wrote:

> -----Original Message-----
>
> Hi.
>
> I have gotten this to work satisfactory now.
>
> The shutdown worked, and works well with the Eaton software.
> My problem was startup after power returned. The UPS would not turn off the power after shutdown, meaning the autostart on power return in BIOS did not work.
>
> When trying out various settings for shutdown yesterday, among others switching the setting for power cut off on and off, the software suddenly lost contact with the UPS. After reconnecting I tried power down again, and suddenly the UPS switched off power after the specified time.
>
> So now it is set to wait 30 seconds before initiating graceful shutdown.
> I have timed the shutdown to take approximately 30 seconds, so time allowed for shutdown is set to 60 seconds just to have some headroom, and after these 60 seconds the UPS powers off the outlets.
> On power return the autostart in BIOS kicks in.
>
> So I think the only scenario where the system will not start up again is if the power returns in the 60 second window between start of shutdown and cut off of power from the UPS.
>
> My MB does not seem to support wake on USB, and it also cuts power to the USB ports when hibernating or is switched off.
> I do have another box with a MB that at least keeps power on USB. I might test a bit further with this if I get the time.
>
> Jens
>
>
Yes, they are a very basic UPS (Cheap), and rely on BIOS Auto power on feature to start system after shutdown.

I was thinking you could use ACPI Alarm to power up the system, by setting a time Alarm +5min of shutdown, should solve your issue if power comes back on whilst system is shutting down.
-----Original Message-----


And after some more testing it turns out that this setup is working better than I thought.

If the power returns in the 60 second window between start of shutdown and cut off of power from the UPS, the UPS will still cut the power off for about 10 seconds and then turn it on again. Which means the BIOS autostart works even in this scenario.

I also tested a little with my other box, but could not get that to wake up on USB keyboard activity when the wireless keyboard was connected via USB. However when connected to the PS2 keyboard socket via an USB to PS2 adapter it worked.
I connected the UPS via the same adapter but was not able to get the box started.

So yes my UPS is both basic and cheap but it works for me.

Jens