Need help

[bonnebulle]

Hello,

I cant find help anyway (bpi forums or linux ones)
Right now I loos a audio channel (left headphone)
I try a fresh install of ubuntu and raspbian...
I maybe change some file because the last days the sound was great (stereo)

I have bpi2mu (ubuntu Mate uptodate)
Alsamixer dont give me solution and I dont know where the drivers / config files can be.
I realy need help.

Thanks...