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If raising the boost counter works, I'll make you a build that has it by default.
However, first I'll see if the solution for the mentioned SD card freeze issue solves my problem, as I have found your patch from June 2017 on CVDD2 voltage increase for SD cards. I took that and cherry-picked on top of the v3.14 branch, then created a custom 3.14 build for further testing during normal operation. It works so far without issues. We'll see how it goes for a week.
By the way, regarding power management, is there any chance of Rockbox PM distorting audio at specific volume ranges? How is the voltage of the end amplifier (that generates the output for headphones) linked to CPU voltage/frequency?
If that patch helps, just update and you'll have those changes.
Yes. There is a seperate power rail for the audio system. The voltage is set so that the player will distort above 0dB.
QuoteIf that patch helps, just update and you'll have those changes.Yes, I know but my intention was to keep the stable build if possible and have the fix only for things that really need to be fixed.
Good to know. I also noticed that above 3 dB the volume doesn't change immediately but with a 2 second delay. Is this some kind of software volume overdrive that takes place in the audio buffer?
I've also read in a previous thread that voltage for the audio system is lowered for power management purposes if I stay at lower volume levels.
I can hear pops & crackles when adjusting the volume between -43 and -44 dB, -9 and -8 dB, -3 and -2 dB, 1 and 2 dB. These are hardly noticeable during playback but indicate that something changes underneath.
As you have noticed, old builds tend to be less stable than newer ones, so I do not recommend doing this.
We don't do software volume control, and there should not be any delay.
These voltage levels are within spec. I think the minimum impedance without distortion is around 8-10 ohms, that is a hardware thing that cannot be changed and does not depend on voltage.
http://gerrit.rockbox.org/r/#/c/1555/Is this what you experience?
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