[alsa-devel] Oh, BTW... (OPL3 PM issue)

Takashi Iwai tiwai at suse.de
Thu May 15 11:45:13 CEST 2008

At Wed, 14 May 2008 23:45:44 +0200,
Andreas Mohr wrote:
> Hi,
> unfortunately I forgot to mention this:
> when I tested OPL3 functionality of my driver, I of course also
> tested this to do proper power management, and... well... it didn't!
> The result of doing an S2D was that the formerly perfectly playing
> emulated MIDI synth ended up with distorted (sort of Micky-Mouse'ish)
> voices directly after resume.
> I really don't think that it's my driver's power management which is
> at fault here, and I'd strongly guesstimate that ALSA does its own
> generic OPL3 power management handling for standard OPL3 hardware registration.
> So??? (aka "what the...!?")

I guess the current OPL3 core code doesn't support PM.
It should stop playing notes and save/restore the synth patches, but
it's not done properly.  The same is true for other synth subsystems.


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