11-12-2019, 08:36 AM
(11-12-2019, 08:23 AM)ctrlX Wrote: The biggest issue for me with preview 2 is the sound. For me it is very audible. It is a constant hissing sound and sometimes there is even a rather loud "popping" sound. Makes the PBP annoying to use at the moment...
Yup, same here to. That's exactly what I wanted to say with my comment:
(11-12-2019, 01:37 AM)DrYak Wrote: But the speaker are extremely noisy if there's no sound playing (it seems/sounds that their level is left floating when there's no output)
It looks like some low-level problem (is there a firmware being used? bugs in the driver? bugs in the parameters / device tree describing the wiring of the sound chip ? sorry I'm new in the SBC world, my day job is at the other end of the Linux scale, more big-iron) where the speaker (or more likely its amplifier) is left floating when there is no sound playing and its amplifier is picking up random electrical noise within the computer (the touchpad seem a big source in my tests).
As soon as there's sound playing, there's a pop (speaker's amp getting suddenly connected to an actual signal ?) and the noise is greatly reduced while there's sound playing.
As soon as the pulseaudio mixing daemon stops sending sound to the alsa driver, the noise returns (speaker's amp again left floating freely ?)