Tried it now with complete different setup, still the same.AAhh, well, power supplies can indeed cause such effects.
What actually causes such "whining" is usually vibrating capacitors. If they hit the resonance frequency of the PCB, the PCB starts to vibrate which turns into the noise you can hear.
Power Supplies (especially cheaper ones) can cause different vibrations - which lead to that issue. It can basically happen with any device.
The first power supplies Craig sourced from China for the Pandora actually caused the touchscreen to stop working, as the power signal was VERY unclean.
Please try a different power supply and cable to see if that changes something!
Hm, interesting. Please check the following:I've been getting audio volume fluctuations (usually quieter), presumably under load but not always. In those situations, holding any keyboard key would increase the volume a bit until letting it go as well.
Is that behavior known? I know software state for audio is pretty basic, but this isn't a hardware issue, is it?
Far fetched, but can it be the volume wheel? Even when untouched it sometimes flickers and changes on its own.
What are the mapping steps? If they are like 5% or something, and the wheel flickers around a border that sounds plausible.
Hm, interesting. Please check the following:
1. Test if volume changes if you press on the case (not a key). The speakers use spring contacts - maybe they don't have a proper contact on your unit (which changes if you press on the case).
2. Open Alsamixer to see if the volume actually changes.
This can be related to some weird audio mixing / channel mapping.I've not been able to reproduce it the same way as yesterday yet, but there has been similar behavior under load at least. Nothing keyboard related, moving windows around made it quieter (extra load from compositor if I had to guess). After a bit of messing around, the volume isn't really coming back either. Sometimes the right speaker is a good bit quieter than the left one for short bursts during this as well.
No visible changes in AlsaMixer, nothing for the balance either.
No changes from pressing around the case, though right now keyboard input doesn't affect anything either.
This is kinda weird and inconsistent, but doesn't look like it's hardware at least.
While this does appear to happen under load, it's not like the audio itself ever cuts off or stutters when it happens. Yeah, this is probably not that helpful after all, but something is up.
I agree, all hispanics are alienated due to the missing ñObligatory complain: The keyboard layout is terrible.
I'm one of those that can hear pretty well, and eventhough the Pandora audio cirquits were created by an audiophile, I could still hear the hiss (white noise) when the screen was active. So to listen to music I either had to disable the screen or use those big headphones that need lots of power and by increasing the volume, the signal/noise ratio was good enough to make the hiss inaudible.It's not loud enough to annoy me, so please see this as a single information.
ALSA's default behavior is entirely based on mostly HW-specific configuration templates (/usr/share/alsa), which should always default to an unmodified stereo output. Stereo upmixing is something that one needs to configure manually, it is not an internal feature but requires making use of its channel mapping plugin in a certain way.Who knows what ALSA makes of that... maybe it tries to do some 5.1 mixing with these four speakers and tries to create a virtual center?