Takes a boolean argument or the constant
auto. Can be also
specified without an argument, with the same effect as a positive
boolean. If enabled, the systemd manager (PID 1) shows terse
service status updates on the console during bootup.
like false until a unit fails or there is a significant delay in
boot. Defaults to enabled, unless quiet is passed as kernel command
line option, in which case it defaults to
When a unit fails, systemd enables status messages despite the
quiet option has been passed but was overridden by such a condition, the status messages are re-disabled when the system has finished booting (even if only to emergency mode).
Currently, systemd only ever prints status messages during the initial startup, and during shutdown. However a unit failure can cause the
quiet option to be overridden during shutdown, even if the unit failure occurred before the shutdown was initiated.
A second case where
quiet is overidden is when a unit is taking a while, and systemd prints an animation showing how long the unit is allowed before it times out.
The two different override cases can be found in the source code, by looking for
There is not a call to
manager_flip_auto_status(m, false) when the system shuts down. At least not in systemd v235-135-g41dfa61d3.
For example, I am currently seeing status messages on startup, due to systemd-backlight trying and failing to set a laptop backlight on an asus desktop. (Probably some strangeness with the platform driver; there are no devices in
/sys/class/backlight when the system has finished booting, but it seems that systemd finds one during the boot process).