I've tried the workaround I've described in bug 1866194 comment 7, but it doesn't work on this device.
As Rex mentioned, it's probably a known limitation... for the time being, I'll use the HDMI audio output and plug my headphones to my external screen (that works fine).
@Daniel:
I've tried the workaround I've described in bug 1866194 comment 7, but it doesn't work on this device.
As Rex mentioned, it's probably a known limitation... for the time being, I'll use the HDMI audio output and plug my headphones to my external screen (that works fine).