control the APM BIOS and display its
utility controls the Intel /
Microsoft APM (Advanced Power Management) BIOS and displays the current status
of APM on laptop PCs.
The options are as follows:
- Display the current AC-line status as an integer value. The values 0, 1
and 2 correspond to the “off-line” state,
“on-line” state or “backup power” state,
- Display an integer value reflecting the current battery status. The values
0, 1, 2, 3, correspond to the “high” status,
“low” status, “critical” status,
“charging” status respectively.
- Disable/enable suspending of the display separately from a normal suspend
using the boolean value for enable. This
feature seems to not work on many different laptops, including the
Libretto 30CT and 50CT.
- Enable or disable APM functions of the computer, depending on the boolean
- Depending on the boolean value of enable,
enable or disable the HLT instruction in the kernel context switch
routine. These options are not necessary for almost all APM
implementations, but for some implementations whose
“Idle CPU” call executes
both CPU clock slowdown and HLT instruction,
false is necessary to prevent the
system from reducing its peak performance. See
- Display the remaining battery percentage. If your laptop does not support
this function, 255 is displayed.
- Enable the resume wakeup timer, if the laptop supports it. This does not
actually suspend the laptop, but if the laptop is suspended, and it
supports resume from suspend, then it will be resumed after
delta seconds (from when you run this
command, not from when you suspend).
- Display the status of the APM support as an integer value. The values 0
and 1 correspond to the “disabled” state or
“enabled” state respectively.
- Display the estimated remaining battery lifetime in seconds. If it is
unknown, -1 is displayed.
- Transition the system into standby mode. This mode uses less power than
full power mode, but more than suspend mode. Some laptops support resuming
from this state on timer or Ring Indicator events. The output of
apm tells what your laptop claims to
- Suspend the system. It is used by
If no options are specified,
information and current status of APM in verbose mode. If multiple display
options are given, the values are displayed one per line in the order given
has been merged in
replaces all of its functionality.
Some APM implementations do not support parameters needed by
. On such systems,
displays them as unknown.
Some APM implementations cannot handle events such as pushing the power button
or closing the cover. On such implementations, the system