The power-management tag has no wiki summary.
2
votes
1answer
16 views
Querying display power status on Linux (Xorg) on command line
Is there a way to query the power status of an Xorg/X11 display from command line? I want to know if my laptop LCD is powered on after the screen saver--apparently the backlight is still on. This is ...
1
vote
1answer
51 views
Acpid and Startup Brightness
On Arch Linux on my laptop, I have acpid control the brightness level based on AC plug events. Plugging in gives me max brightness and running on battery sets it at the minimum.
My problem is that ...
1
vote
1answer
125 views
Suspending laptop fails ~50% of the time
Running ArchLinux and GNOME 3 on a Thinkpad X220.
When I suspend my laptop it goes into sleep mode and the LED ring around the power button fades in and out.
When a suspend fails, the LED ring and ...
7
votes
4answers
4k views
How to find power draw in watts?
I've been asked to estimate the power consumption of the servers I run for my laboratory. I thought and I'd ask if there was some handy linux commandline to get the power consumption of the server. It ...
1
vote
1answer
928 views
No gnome-power-manager command but it is installed on arch
I'm running latest Arch, have gnome and fluxbox and my main windows manager is Fluxbox. I wanted to manage my power settings in fluxbox and i added gnome-power-manager in startup but is says there ...
0
votes
0answers
30 views
How to find code called by suspend_ops->enter(state); [migrated]
I am trying to understand the linux kernel power management at a low level and have finally got stuck since my C is not very strong. I am able to follow the code down to where it calls ...
1
vote
1answer
41 views
Power consumption monitoring problem
I used powertop v.2.1 under Ubuntu 12.04 but it missed the power est. column.It's the same situation as described https://bugzilla.redhat.com/show_bug.cgi?id=796068 and that bug is supposed to be ...
0
votes
1answer
30 views
What does the package UPower output if on a desktop
On Ubuntu 12.04, if I use the command:
upower -i /org/freedesktop/UPower/devices/battery_BAT0
It will output all of the statistics for the battery. However, what does it output if I am using a ...
4
votes
1answer
79 views
How to Reset/Cycle Power to a PCIe Device?
I have a PCIe device that only works correctly when the computer is fully powered off then on again. Issuing a simple reboot or reboot -p command does not appear to cycle the power to the PCIe card, ...
4
votes
2answers
71 views
Do I need acpid in a virtual machine?
I'm always wondering if power management facilities in a virtual machine is necessary?
i.e acpid.
And I'm not sure if they still function in a virtual machine.
3
votes
0answers
46 views
Exynos 5 DVFS or turning off cores in Ubuntu - Scaling frequency for one of the cores only (dual core) (cpufreq)
I was wondering if there is possible to scale only one of the cpu cores in the A15 in Exynos 5 ? I have tried using e.g cpufreq-set -c 1 -f 500MHz, but both cores are set to the same frequency. When ...
2
votes
0answers
67 views
Does UEFI increase battery life?
I've heard about a better power management when using UEFI instead of BIOS. Is that true? It was about energy consumption being more efficient or something like that.
If it is true, has the ...
1
vote
0answers
99 views
Opening lid results in black screen (Dell Laptop with ATI Graphics, Ubuntu 12.04, 3.2 kernel, GNOME 3)
For the past few weeks, when opening the lid my laptop often fails to recover from suspension leaving me with a blank screen. Further, when this bug occurs, the laptop fans continue to run while the ...
4
votes
2answers
130 views
Return value of current watt consumption on command line
Is there a way to return the current watt consumption on the command line? I have found about the powertop program, but have not seen a way to return the Watt consumption as a value to the command ...
3
votes
4answers
444 views
How to disable energy saving on notebook screen when using Scientific Linux 6.3?
So there is a notebook that has Scientific Linux 6.3 installed with GNOME 2.
If we don't press any button on the keyboard or move the mouse, the screen of it turns black.
But: if we move the ...
1
vote
1answer
52 views
any utility on centos 6 to sound an alarm when power is low
Is there an application that will set an audible alarm when the battery goes low on a centos 6 IBM 430 machine?
Details of the problem here:
I have set it hibernate when battery is low. However, it ...
3
votes
2answers
330 views
How do I make Powertop's suggestion's permanent?
When I run Powertop, and look at the Tunables screen, about twenty things are listed as Bad. I can toggle these to Good by pressing enter, and when I do so, projected battery lifetime doubles.
How ...
0
votes
0answers
57 views
scrolling lost after standby
Linux Mint 14
Cinnamon
I have this below script which I run manually once to enable scrolling after I login.
synclient VertTwoFingerScroll=1
synclient HorizTwoFingerScroll=1
synclient ...
1
vote
3answers
1k views
Ubuntu 12.10 Fan overspeeding
I have installed Ubuntu 12.10 leaving Win 7 licensed version. But again as usual I need to fix so many issues.
This time fan is generating lots of noise. It looks it is running at max speed. My ...
1
vote
0answers
412 views
Intel Core i3/i5/i7 Sandy Bridge CPU throttling
Intel Sandy-Bridge family i5 Core CPU, running Linux kernel 3.2 (Debian Squeeze/Wheezy), under heavy computation load, does not react to to cpufreq-set -g powersave (using acpi_cpufreq module). It is ...
4
votes
1answer
206 views
pm-utils: No network in suspend scripts?
I'd like to put a script in /etc/pm/suspend.d/ that needs network access (for a very short time) before allowing the system to suspend. However, even with scripts named "001_something" in ...
1
vote
0answers
61 views
NetworkManager: disabled network when sending system to sleep
When I suspend my notebook, NetworkManager disables the wireless network (in nm-manager.c:do_sleep_wake).
However, I'd love to still use the network for a very short time (to unmount cifs mounts, ...
4
votes
2answers
3k views
Ubuntu Server Continuously “goes to sleep”
I am running a web server at home using Ubuntu 11.4 (maybe? I can't 100% recall) on an older AMD 2400+ desktop with 1 or 2 GB of RAM. Sorry I can't recall the details 100%.
Anyway, I have a KVM ...
1
vote
3answers
2k views
Avoid display blanking under X
I have an Ubuntu Linux box (12.04). I can't prevent the screen blanking under X.
I have tried the command xset s off, inserted the command line kernel parameter acpi=off in grub at kernel boot. ...
7
votes
1answer
210 views
Power saving enables touchpad
I've installed power saving packages (bumblebee, laptop-mode-tools, and cpufreq) to my laptop with Debian Wheezy. Thanks to that I decrease power usage from 32W to 10W. But now I faced the issue that ...
1
vote
1answer
453 views
What is kondemand?
I have searched the web for the answer of this question but couldn't find a clear answer. Best answer I found was as follows:
kondemand is a kernel thread that belongs to the ondemand governor of
...
8
votes
2answers
333 views
System-wide power management policy on debian-based distros?
I would like to put idle machines in our lab (running Mint Debian edition) on standby after a timeout. I have tried pm-suspend and it puts the machines on standby and wakes up fine.
Does anybody know ...
2
votes
2answers
307 views
How can I get an alert when my battery is about to die in Linux Mint?
This happens to me more than I'd like to admit, but sometimes I don't notice the power getting low since it only shows up in my status bar, then the computer just quits. I'd like a big alert that ...
0
votes
0answers
73 views
Prevent udevd from inspecting this device?
I think this error message was from my usb mouse, how could I know that?
systemd-udevd[225]: error opening ATTR{/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3:1.0/power/control} for ...
0
votes
0answers
157 views
Undervolting in Linux
Could you recommend me something different like Linux-PHC for undervolting in Linux?
I would like to undervolt my AMD Phenom 9850 CPU. I am using Debian squeeze x64.
For underclocking I use ...
1
vote
0answers
68 views
What changed in Linux kernel (2.6.22) that gives hdparm support for power-on in standby?
Hdparm man page lists for parameter -s:
Enable/disable the power-on in standby feature, if supported by
the drive. VERY DANGEROUS. Do not use unless you are abso-
...
3
votes
1answer
629 views
Why does drive not enter standby mode when using hdparm -S
When reading the hdparm manual pages, it says that the -S value
is used by the drive to determine how long to wait (with no disk
activity) before turning off the spindle motor to save power
...
3
votes
1answer
238 views
How to stop waking all attached drives on reboot / deactivating swap?
A fresh install of Debian 6.0.6 for a system has 13 SATA drives attached. 12 refurbished WD-10EARS drives are yet unpartitioned. 1 WD1500BLFS drive is configured for OS and swap. Swap partition is ...
1
vote
0answers
140 views
How to disable nvidia ion on Asus eeepc 1201NL?
It seems that my netbook consumes battery too aggressively. I've been told that Nvidia ION videocard embedded into it has 2 cores and one of them is consuming battery all the time in Linux, since it ...
1
vote
3answers
786 views
Why kernel 3.6.2 is so much less energy efficient than 3.6.1 on Mint 13?
I noticed, that the power consumption in my ASUS P53E notebook is doubled (from 10W to 20W) when I change from kernel 3.6.1 to 3.6.2 (or later). I use Ubuntu Quantal mainline kernel from ...
1
vote
1answer
190 views
Thinkpad T400: Suspend to HD doesn't resume
I've got a Thinkpad T400 with Gentoo Linux installed. Suspend-to-RAM works like a charm.
However, Susped-to-Disk doesn't work: if I suspend, the Laptop powers down and accesses the HD for around 30s. ...
6
votes
6answers
5k views
How can I improve battery life in Fedora 15?
I am seeing a horrible battery life with Fedora 15 (lovelock) with Gnome Shell 3 on my laptop. I keep the screen brightness, back light pretty low. I still get about 1 hr 50 minutes battery life out ...
3
votes
3answers
394 views
How can I set power button (on computer case) to power off system with `systemd`?
How can I set the power button (on my computer case, not keyboard) to power off the system with systemd (without acpid)?
1
vote
3answers
2k views
How to turn off all screensaver/display power saving methods under Scientific Linux 6.1?
How can I ensure that my screen won't go "black" after given time?
5
votes
1answer
249 views
Is it possible to automatically wake from suspend?
Here's my problem:
I have a laptop running Arch that I just keep on at home. It's got a good 4 hour battery life, but sometimes my daughter is playing near where it's kept and ends out pulling the ...
3
votes
1answer
2k views
How to adjust charging thresholds of laptop battery?
My laptop is Lenovo T400, and OS is Ubuntu 12.04.
I have not been able to adjust the thresholds for battery starting charging and stopping charging. I observed that its current starting charging ...
1
vote
1answer
761 views
Debian hibernate problem PM: Swap header not found
I have Debian 6 2.6.32-5-amd64 on netbook. With pm-utils Sleep works but hibernate fails with error: PM: Swap header not found!. Swap was enabled using ubuntu tutorial after installation - this is ...
2
votes
0answers
135 views
Console won't power off on PowerPC with Debian
I installed Debian 6.0 on a Power Mac G5. First it would boot to a blank screen but I fixed that by blacklisting nouveau as described here.
Now the monitor will never turn off. It's a server so I'll ...
8
votes
1answer
346 views
Screen brightness reverts to max after returning from `xset dpms` display suspend
I'm running the openbox window manager and using this line in my autostart.sh to control display power management:
xset dpms 0 60 0
This works nicely, causing the display to suspend after 60 ...
2
votes
1answer
356 views
Preventing ChromeOS from blanking the screen when working on a different tty
I am running Archlinux in a chroot alongside Chrome OS on a chromebook. The original project is there, my fork of it is here (mostly similar).
The issue is that the display power management of Chrome ...
2
votes
1answer
119 views
Measuring the current or the power
Is there a way to measure the electric current or power of the whole computer or its components using software? Voltage can be measured, and I am wondering why not with the current/power.
1
vote
1answer
84 views
ACPI (Advanced Configuration And Power Configuration) not present on 2.6.38.8?
I need to disable some parts in ACPI, but it is
simply not present in kernel 2.6.38.8 (downloaded
as a tar from net)?
I can see the option in kernel 2.6.34-12 (default
on OpenSuse 11.3), but not in ...
1
vote
1answer
335 views
Hibernate does not power down laptop
I have an Asus U30J laptop with both windows 7 and Linux Mint 12 installed.
When I try to hibernate the laptop, the following message appears on the screen and I have to push the power button to ...
2
votes
0answers
190 views
Ethernet NIC power usage on laptop?
I was wondering if the ethernet NIC draws any power at all when using Wifi? If it does, since I rarely use it, so is there a way to completely turn off the power from the device? I know some devices ...
1
vote
1answer
257 views
disk spins-down too fast
I use Ubuntu 12beta on Lenovo Z575. I noticed that the disk spins down very quickly, few seconds after the last operation. And when I am working, e.g. in the vim and write quite often, it spins-up and ...
