A little birdie just told us about stock firmware:
Vibra is not built into all units, but if yours has a vibra motor you can turn it on by issuing:
echo ro.board.has_vibrator=yes >> /data/local.prop
If you want to damage your hearing, this one is for you:
echo ro.audio.no_adjust=yes >> /data/local.prop
We’ll not be held responsible for whatever you do with this information. For all we know the unit might try to bite you or eat your homework!
How can these command be executed?
I could imagine what the first command would do, but what happends after the second command? Does the max audio level go up, so you can turn it louder?
And I guess to put the original settings back, you should execute them with =no ?
What will happen with new firmwares? Will they reset these settings?
You could run them via ADB or from connectbot. I hear you might need to be root for this to work.
To disable those you’d need to delete those two lines from the file e.g. by editing it.
Disclaimer: I don’t own a gen9 device yet, so I don’t know the details.