Bug#859477: debian-live: Make desktop emit some sound on startup

[Samuel Thibault <sthibault@debian.org>]

Package: debian-live
Severity: normal
User: debian-accessibility@lists.debian.org
Usertags: a11y

Hello,

The debian live cd is accessible to blind people by pressing
super-alt-s. It is however hard to know when one can press that
shortcut. The desktop should thus emit some sound when it is ready to
interpret shortcuts.

Samuel

-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'buildd-unstable'), (500, 'unstable'), (500, 'stable'), (500, 'oldstable'), (1, 'experimental-debug'), (1, 'buildd-experimental'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.10.0 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)