Unmute and sanitize mixer levels on Jessie
Originally created by @intrigeri on #7591 (Redmine)
In commit 2fc2715b, we drop alsa-utils -related bits. The corresponding
initscript runs sanify_levels_on_card
, which might be superseded by
PulseAudio on Jessie, or not. We should check that the mixer levels are
fine on various hardware (especially that is special-cased by alsa-utils
scripts) on startup.
Feature Branch: feature/jessie