Wakeup from hibernation

Spooky · 2006-06-13, 15:52

I've a technical question about how a Computer can be waked up from hibernation by itself (other than manually set an alarm time or with WOL).
What exactly does a plugin like PowerScheduler to make this happen..? What are the technical background etc. (something with ACPI I guess?).

hwahrmann · 2006-06-13, 20:06

Hi Spooky,

yes, it has to do with ACPI.
A PC can be in S3 (Standby) or S4 (Hibernate).
.NET programs may use something like a WaitableTimer.
This is what Powerscheduler is doing, to set a specific time, when the pc should come up again.

regards,

Helmut

tklon · 2006-06-13, 22:25

Quote:

Originally Posted by Spooky

... or with WOL.

WOL doesn't work with my htpc when it is in hibernation. Is it possible that I can change that with a bios setting or something else?

Spooky · 2006-06-14, 10:55

@hwahrmann: ok, but where exactly is powerscheduler setting the wakeup time? Is it some part of the BIOS, which is writeable from out the OS or something?

@tklon: hm... I think my HTPC wakes up with WOL even in hibernation, but I am not sure though. I wouldn't know any BIOS setting for that anyway.

hwahrmann · 2006-06-14, 12:26

Hi Spooky,

it interogates with the computers RTC (Real Time Clock), which signals an interupt to wake up the PC.
see: http://de.wikipedia.org/wiki/Echtzeituhr for a description of rtc.

regards,

Helmut

tklon · 2006-06-14, 16:51

Quote:

Originally Posted by Spooky

I think my HTPC wakes up with WOL even in hibernation, but I am not sure though.

Hi Spooky, could you please test that and post your result here. Thank you.

hwahrmann · 2006-06-14, 17:10

hi tklon,

even with my PC completely shutdown, i can do a WOL.
Don't need to be in hibernate or standby for that.
if your BIOS and NIC support WOL you should be able to turn on the pc without any problems.

regards,

Helmut

tklon · 2006-06-14, 19:17

WOL doesn't work for me only when the pc is in hibernation. I know how it works because I use it already since the first days of my htpc.

Have a look here (post from Jan 31, 2005):
http://forum.team-mediaportal.com/viewtopic.php?t=4219

Spooky · 2006-06-21, 15:28

Quote:

Originally Posted by tklon

Quote:

Originally Posted by Spooky

I think my HTPC wakes up with WOL even in hibernation, but I am not sure though.

Hi Spooky, could you please test that and post your result here. Thank you.

I'll do that when I get home next weekend

I hope I don't forget..

Spooky · 2006-08-06, 16:51

Well, look at that... completely forgot. Anyway, you were right, I can't wakeup the HTPC from hibernation with WOL.

2006-06-13, 15:52	#1 (permalink)
Spooky Portal Member Join Date: Feb 2005 Location: void 4tl Age: 25 Posts: 323 Thanks: 20 Thanked 5 Times in 5 Posts Country: My System	Wakeup from hibernation I've a technical question about how a Computer can be waked up from hibernation by itself (other than manually set an alarm time or with WOL). What exactly does a plugin like PowerScheduler to make this happen..? What are the technical background etc. (something with ACPI I guess?).

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2006-06-13, 20:06	#2 (permalink)
hwahrmann Portal Developer Join Date: Sep 2004 Location: Vienna, Austria Posts: 1,503 Thanks: 3 Thanked 94 Times in 57 Posts Country:	Hi Spooky, yes, it has to do with ACPI. A PC can be in S3 (Standby) or S4 (Hibernate). .NET programs may use something like a WaitableTimer. This is what Powerscheduler is doing, to set a specific time, when the pc should come up again. regards, Helmut

2006-06-14, 10:55	#4 (permalink)
Spooky Portal Member Join Date: Feb 2005 Location: void 4tl Age: 25 Posts: 323 Thanks: 20 Thanked 5 Times in 5 Posts Country: My System	@hwahrmann: ok, but where exactly is powerscheduler setting the wakeup time? Is it some part of the BIOS, which is writeable from out the OS or something? @tklon: hm... I think my HTPC wakes up with WOL even in hibernation, but I am not sure though. I wouldn't know any BIOS setting for that anyway.

2006-06-14, 12:26	#5 (permalink)
hwahrmann Portal Developer Join Date: Sep 2004 Location: Vienna, Austria Posts: 1,503 Thanks: 3 Thanked 94 Times in 57 Posts Country:	Hi Spooky, it interogates with the computers RTC (Real Time Clock), which signals an interupt to wake up the PC. see: http://de.wikipedia.org/wiki/Echtzeituhr for a description of rtc. regards, Helmut

2006-06-14, 17:10	#7 (permalink)
hwahrmann Portal Developer Join Date: Sep 2004 Location: Vienna, Austria Posts: 1,503 Thanks: 3 Thanked 94 Times in 57 Posts Country:	hi tklon, even with my PC completely shutdown, i can do a WOL. Don't need to be in hibernate or standby for that. if your BIOS and NIC support WOL you should be able to turn on the pc without any problems. regards, Helmut

2006-06-14, 19:17	#8 (permalink)
tklon Portal Member Join Date: Sep 2004 Location: Germany Age: 43 Posts: 311 Thanks: 4 Thanked 0 Times in 0 Posts Country: My System	WOL doesn't work for me only when the pc is in hibernation. I know how it works because I use it already since the first days of my htpc. Have a look here (post from Jan 31, 2005): http://forum.team-mediaportal.com/viewtopic.php?t=4219

2006-08-06, 16:51	#10 (permalink)
Spooky Portal Member Join Date: Feb 2005 Location: void 4tl Age: 25 Posts: 323 Thanks: 20 Thanked 5 Times in 5 Posts Country: My System	Well, look at that... completely forgot. Anyway, you were right, I can't wakeup the HTPC from hibernation with WOL.