Pinebook Pro Revised Keyboard Firmware

[dsimic]

Hiss, don't rememer that.  From the speakers?  Does a mixer like alsamixer affect it?  Does it stop if you play a sound file?

I don't think that the hissing sound came out of the built-in speakers.  Though, I haven't attempted any debugging, because I wanted to complete the firmware upgrade as quickly as possible.  Another thing I've noticed is that the hissing sound started almost immediately after powering up the laptop, during the power cycle that followed the first step of the firmware upgrade.  If it started hissing so early, and the restoration of the sound card settings during the startup made no difference to it, I doubt that the source of the hissing sound was connected to the audio codec in any way.

You aren't mixing iso and ansi versions are you?

Nope.  It is an ISO variant, and it belongs to the first batch.