Bug 350622

Summary:	Laptop goes to sleep while there is MIDI input
Product:	[Frameworks and Libraries] frameworks-kidletime	Reporter:	Kelytha <kelytharun>
Component:	general	Assignee:	kdelibs bugs <kdelibs-bugs>
Status:	RESOLVED INTENTIONAL
Severity:	wishlist	CC:	kde, mgraesslin
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Kelytha 2015-07-25 23:12:17 UTC

As simple as description says. Typing on the keyboard or moving the mouse keep the computer awake, but MIDI input doesn't.

Reproducible: Always

Steps to Reproduce:
1. Disconnect your laptop's charger
2. Connect a MIDI controller and start a software synth (like LMMS)
3. Enjoy playing some music

Actual Results:  
After some time the laptop goes down to sleep.

Expected Results:  
MIDI input should be treated like any other kind of input and prevent the computer from sleeping.

Comment 1 Christoph Feck 2015-08-01 19:28:56 UTC

Is MIDI input routed through X11? I doubt it.

Comment 2 Kelytha 2015-08-01 19:34:50 UTC

(In reply to Christoph Feck from comment #1)
> Is MIDI input routed through X11? I doubt it.

It is routed through ALSA or JACK. As I have looked through the code of KIdleTime this does seem to be notoriously difficult to implement. TBH I am not even sure if it is possible at all, especially without adding extra latency to the MIDI stack.

Comment 3 Kai Uwe Broulik 2015-08-01 19:46:59 UTC

So it seems the only viable solution is to have your application post a powermanagement inhibition so the screen does not turn off.

Comment 4 Martin Flöser 2016-06-21 16:54:27 UTC

Midi-input sounds as out-of-scope for kidletime. This is something which either should run as a daemon process or - in case of a GUI application - to use the inhibition frameworks.