New answers tagged power-management
1
To test whether your monitor is on or off you can use
$ xset q | grep Monitor
Monitor is On
In order to determine the brightness of your LCD backlight you can run
$ xbacklight
70.000000
1
But if your computer actually keeps track of power (e.g. notebook), than on kernel 3.8.11 you can use the command below. It returns power measured in miliwatts.
cat /sys/class/power_supply/BAT0/power_now
This works on kernel 3.8.11 (Ubuntu Quantal mainline generic).
1
Alternative Power Apps
There are several power management apps listed on the Linux App finder site.
Of the ones listed I've used GKrellM & PowerTOP. Perhaps one of these will suit your needs.
I did a quick look through most of these apps. I didn't see the feature where power consumption was broken down by device. I ...
0
From a workstation:
$ upower -i /org/freedesktop/UPower/devices/battery_BAT0
Output:
failed to set path: cannot refresh: Cannot get device properties for
/org/freedesktop/UPower/devices/battery_BAT0: Couldn't call GetAll() to
get properties for /org/freedesktop/UPower/devices/battery_BAT0: Method
"GetAll" with signature "s" on interface ...
3
Potential Method #1
I think you can do it with these commands:
disable
echo 0 > /sys/bus/pci/slots/$N/power
enable
echo 1 > /sys/bus/pci/slots/$N/power
Where $N is the number of the PCI slot.
lspci -vv may help to identify the device. This is not very well documented...
Potential Method #2
I came across this thread on U&L, similar ...
3
I would leave it. I believe ACPI does more than just power management. For example I believe there is a ACPI event that is sent in via the VM Host to the guests when you want them to shutdown or reboot.
Excerpt from Manual:KVM:
shut-down
issue ACPI shut-down command to KVM guest, if guest does not
support ACPI, command have no effect.
reboot
...
4
Strictly speaking, no you don't need acpid in a virtual machine nor on a real system. But you should install acpid in a VM as it typically handles the power button press which is simulated by the hypervisor if you shutdown a VM.
So for practically reasons, yes you should install acpid on a VM.
P.S: acpid doesn't really do power management
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