System went to sleep in stead of a wake up

[Sheik Yerbouti]

I had a failed recording last night. "Recording service not running at recording time". I looked in the windows logs and I see something strange:

[ATTACHMENT NOT FOUND]
[ATTACHMENT NOT FOUND]

So there's a power event from the recording service and at the exact same time the system goes to sleep? I should mention I'm no expert in reading Windows logs . The npvr logs show "Requesting wake up for 'RecordingOID3968' at 23-1-2012 22:53".

Chris

[Sheik Yerbouti]

Maybe I should translate the screens: the first picture says: "PowerEvent is processed by the service", the second picture: "The system is put to sleep, reason: System inactive". As you can see, the times are exactly the same.

Chris

[sub]

I cant explain that. There is definitely no code in NextPVR that will ask the machine to go to sleep.

There is calls to request the machine is awake at a specific time, but these are entirely different calls than you'd use to put a machine to sleep.

[Sheik Yerbouti]

I've read it wrong. The system is going to sleep and the first picture just means that the recording service has processed the system call. I noticed other services showed the same message, sorry for the confusion. But it's still weird the machine went to sleep, while it should be awake to record. It's the second time this weird thing happened and I've never had these problems before 2.3.6. But you probably hear that every release

Chris

[sub]

I'll keep an eye out for other reports of it going to sleep during a recording. I dont think anything has changed with that stuff.

[imilne]

You're not running the MCE Standby Tool are you? Check it doesn't have its "ignore applications that try to prevent sleep" checkbox selected.

Iain

[Sheik Yerbouti]

You're not running the MCE Standby Tool are you? Check it doesn't have its "ignore applications that try to prevent sleep" checkbox selected.

Iain

No, but thanks for thinking with me. I tried powercfg -waketimers and it gave an error. So I rebooted my machine and tried again and I got output. So maybe something wasn't fresh in my powerconfig. I now output this command after an EPG update, so I can check some more if the problem should occur again.

Chris

[pds]

I have noticed this issue as well using XP, and put it down to Windows deciding to go to sleep just before NPVR asks for it to wake, and is therefore a bug in the Windows sleep scheduler, one which still persists in Win7 apparently. The wake event will have already passed by the time windows has completed its sleep processing, causing it to be missed. This is worse if using hibernate as the process can take over a minute to complete.

A simple fix would be for NPVR to request 2 wake events seperated by a couple of minutes, or the recording service to stop the sleep event if a pending operation is waiting within a few minutes.

I have been working around this for some time by making sure one recording+post pad+sleep timeout <> next recording-pre pad time.

[Sheik Yerbouti]

Thanks, pds. I'm not 100% sure this is what happened on my system, but it's good to know should it occur again.

Chris

[WKleeven]

I have 2.2.6 and have had 2 similar issues.
I posted it in this thread: http://forums.nextpvr.com/showthread.php...post430021

The first issue: programmed a running show and one half an hour later. In between the pc should and has gone to sleep. The second recording wasn't recorded, I am not sure anymore but I think the first recording (of the running show) also failed (computer went asleep while recording).

I think pds might be wright in post 8: "The wake event will have already passed by the time windows has completed its sleep processing."


Second issue: programmed a running show. No waketimer was set. Probably not necessary. But I noticed that my pc goes asleep when some programs are running, but not with other programs. I read that some "applications and services make system availability requests by calling the SetThreadExecutionState or PowerCreateRequest function". I hope Sub can tell if NextPVR has this built-in.

We can also make a requestoverride ourselves for a process, for example: POWERCFG -REQUESTSOVERRIDE PROCESS wmplayer.exe System
Is it possible to have NextPVR run a batch-file wehen starting a recording? We could in this way easily prevent the pc from going to sleep. EDIT: ParallelProcessing.bat.