Hi @yusssufff ,
I Have a 10V, so can only report on that. Essentially there has been no progress on this port since the early release. A tiny bonus was limited support was added for usb headsets. Hence, audio support is substandard and lacking.
3.5mm jack has no function at all. Will not work for anything, both audio and mic.
I only have a FIIO KA11 USB DAC to test, and this works for audio play back, but not for calls, and not for mic input. But I don’t think the KA11 supports the mic, I am not sure. So audio via usb works well, but mic I am not sure. Call audio doesn’t route to the usb dac if I make a call.
On a side note, be very careful using the CSD test tool with a usb DAC. It seems the volume control is not present and the volume is potentially damaging for earphones and ears. Woops.
You didn’t ask about bluetooth, but I have a FIIO BTR5 that I use with a 3.5mm headset. Audio, mic, calls, everything, works well with this.
Regarding the phone loudspeakers, the left channel doesn’t play on my 10V. The right channel only plays via the top loudspeaker. This is the result with audio test files and the inbuilt CSD test tool.
I wish the 3.5mm jack worked, but I think there is very unlikely to be improvements in this port by Jolla. So I think it is likely that the audio will never work properly on this phone, short of seeing a community port built on a base of lineage 22.
@Sharks has done a mountain of work to try and get a port based on lineage working for the 10IV, so perhaps soon, the audio on that device will be working very well.
Hope this helps,