volume & interrupted sound

Alexander Motin mav at FreeBSD.org
Mon Sep 1 22:01:45 UTC 2008

rmgls at free.fr wrote:
> 1. The sound volume here is lower than with the original driver.
> (at any mixer level). is it a way to increase it?
> it is always on a sony s5 vaio.

It's hard to say what difference with original driver.
Playback volume may depend on:
  - pcm and vol mixers,
  - ogain mixer which controls external amplifier power on/off 
(sometimes it may be inverted),
  - GPIO pins.
On some systems GPIO pins control external amplifiers, but it is 
absolutely vendor specific and not software detectable. You can play 
with GPIOs using hint.hdac.%d.config device hint (look man snd_hda).

> 2. the sound is regularly interrupted. i suspect an interruption problem.

What you mean exactly by "regularly interrupted"? How often and for how 
long? If you expect interrupt conflict - todays patch version should 
support polling operation (without using interrupts) good enough.

Alexander Motin

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