Ok I found a solution that solves the headphone problem.

Using nano, I add "rate=48000" parameter in the module-load line in /etc/pulse/touch.pa
like this:

###Automatically load the Pulseaudio Droid
.ifexists module-droid-discover. so
load-module module-droid-discover rate=48000 voice_virtual_stream=true hidl_args='helper=false'
.endif

then I restart pulse with:

systemctl --user restart pulseaudio.service

I make rootfs writable with UT Tweak Tool (v1.0.0)

Now wired headphones work properly!
Thank you All

Ok I found a solution that solves the headphone problem.

Using nano, I add "rate=48000" parameter in the module-load line in /etc/pulse/touch.pa
like this:

###Automatically load the Pulseaudio Droid
.ifexists module-droid-discover. so
load-module module-droid-discover rate=48000 voice_virtual_stream=true hidl_args='helper=false'
.endif

then I restart pulse with:

systemctl --user restart pulseaudio.service

I make rootfs writable with UT Tweak Tool (v1.0.0)

Now wired headphones work properly!
Thank you All

Hello everyone,
I installed Ubuntu Touch on my OnePlus6 a few weeks ago.
The system was fine all in all, apart from minor known problems.

Now, a few days ago, I made the recommended update to OTA-10 and so I encountered new problems. The worst of all is that when I put the headphone cable on I don't hear anything and the videos go jerky, while when I disconnect the cable everything is fine.

Now, I ask you if I can downgrade, and if so how? Or does anyone know how to fix this problem? Thank you all