2
votes
1answer
58 views

How can I monitor CPU frequency on Linux servers?

At low CPU frequency, latencies can be higher or we may come to some wrong conclusions related to server capacity. Knowing the CPU frequency is important for high performance scenarios. In case of ...
0
votes
0answers
60 views

Sleep hard disk after X minutes of idle

I want to make two drives sleep after 15 minutes of idle (sdb and sdc) on Linux Arch. I have the idea that hdparm should be able to help me. I can put the disks into standby (hard disk spins down, ...
1
vote
2answers
157 views

Change Behavior of Linux Power Button

I have a headless linux mint machine that I use for a file server and other things. It's been working great for me for a few years, but there's one issue - my cat likes to hang out on top of it, and ...
0
votes
1answer
33 views

How to know which /proc file is used to set the backlight?

How to know which /proc file is used to set the backlight ? $ ls -1F /proc/acpi/ returns : ac_adapter/ battery/ button/ event wakeup xbacklight works. I use awesomeWM with Ubuntu 12.04, on a dell ...
0
votes
0answers
31 views

Ubuntu: Do not show display state when resuming from hibernation

I'm using Ubuntu 13.10 saucy on my laptop. The device is set up to suspend when the lid is closed, prompting for the password when resuming. However, when I resume, the last state of the display ...
-1
votes
1answer
421 views

really disable power save in linux wifi

I've got a laptop with an Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34) (using iwlwifi kernel module). Although power_save (a module parameter) is disabled, I can see 802.11 ...
0
votes
1answer
674 views

Execute a command if Linux is idle for 5 minutes

I would like to execute a command such as notify-send 'a' if my Linux machine has been idle for 5 minutes. By idle, I mean the same thing a screen saver that gets activated would use to define ...
0
votes
0answers
63 views

Computer randomly powered off at exactly 3 am

I am running a Zentyal server at home, set up to run as a gateway, file server, etc. It is running on a fairly standard computer with standard hardware (Intel i3, 8GB RAM, 300W power supply). A few ...
0
votes
1answer
889 views

disabling power save option on wifi device

I use usb wifi dongles that have AR9271 chipset and use compat driver 3.9.1 - ath9k_htc. I use the wifi units to create an ad-hoc wlan. When there is no communication for a while, the nodes leave ...
0
votes
0answers
159 views

Linux, dynamic power management for ATI cards and scaling voltages

Recently, I've been running Linux built from the drm-next-3.11 branch and it works quite fine. However, I'm intrigued by the fact that my card supports two voltage levels, 1000 and 1200, and yet the ...
6
votes
1answer
479 views

is it possible to wake up a Linux device at a specific time

I run Debian on an embedded board. I would like to suspend or hibernate the board say at 10 pm and wake it up at 7 am. There is no problem to suspend/hibernate the board by pmi action ...
0
votes
0answers
66 views

On ubuntu 12.04 the video, after some day of working, turn blank

I have a PC with ubuntu 12.04 which is connected to a video with a resolution of 1366x768, without mouse and keyboard. It happened that after some days of work , without any external input, but only ...
1
vote
0answers
49 views

Linux : governer set to userspace in kernel but is always set to ondemand after the system's booted

I am using the 3.2 Linux kernel on a custom ARM board with Debian Wheezy. My kernel config. for power management is below. I want the system to default to the userspace governer (which the kernel ...
0
votes
2answers
395 views

Does running a dual-core processor with one core disabled reduce power consumption?

I have a Core 2 Duo laptop, and I want to extend my battery life as long as possible. If one was to use an uniprocessor kernel, the second core should not be 'booted' for use by the OS (for lack of ...
1
vote
1answer
495 views

Reduce WiFi power usage

I found that WiFi is draining too much battery power on my laptop. The system has Linux Mint 14 (32 bit) and runs with its default kernel, 3.5.0-17-generic. The driver in use is ath9k and runs on ...
0
votes
1answer
201 views

Computer hangs when resuming from sleep

My laptop (HP Pavilion g7-1075dx Fedora 17 64-bit) does not resume after I put it to sleep, about every third time. I can put it to sleep and wake it up two times or so, and the next time I try it, ...
4
votes
2answers
3k views

What do different values of hard drive's Advanced Power Management feature (hdparm -B) affect, except spin-down?

hdparm's -B parameter is documented as: Get/set Advanced Power Management feature, if the drive supports it. A low value means aggressive power management and a high value means better per‐ ...
2
votes
1answer
624 views

How to make xscreensaver turn off the backlight only when explicitly locked

Is it possible to set up XScreensaver so that it would turn the LCD backlight off only when I lock the screen by hand? I thought it must be controlled by the "Quick Power-off in Blank Only Mode", but ...
0
votes
2answers
864 views

Turning off unused hard drives

I have a PC running Ubuntu 12.10 server as my custom home server. There are a number of hard drives connected to it via USB. The server runs 24-7 and I was wondering if there is any way or any ...
2
votes
1answer
147 views

Need better management of display sleep times in Fedora 17. How to do?

I am using Fedora 17 64bit on an AMD quad core machine. My use is home use with some power user thrown in (spreadsheets, photo editing, music creating). ALL my Television viewing is done by ...
0
votes
1answer
219 views

how to prevent local user from rebooting/shutting down when i'm ssh'd in?

I am currently remotely upgrading a friend's computer with aptitude through SSH. I have bad memories of unstable systems when they are rebooted/shut down during an upgrade process, so I'd like to ...
3
votes
1answer
4k views

How to disable screen shutdown after 1 hour in Fedora 17 (Gnome)?

Fedora 17 doesn't seem to have a "Never" option for the screen timeout setting. Is it possible to disable this power-saving feature? This is for a machine showing a dashboard which should always be ...
1
vote
1answer
337 views

How to stop my laptop from throttling my CPU?

I have an AMD TL-60 mobile processor. I've noticed that often when I watch videos, I get a really jerky playback. I can fix it if I run the following command: echo 2000000 > ...
1
vote
0answers
103 views

Linux and battery usage [closed]

I want to install a linux distro on my laptop but I do not want to have a massive battery drain. I remember reading some kernels drain the battery faster then others? Would Mint Linux or Ubuntu out of ...
1
vote
0answers
701 views

Dynamically disabling cores in a power-efficient way?

I am looking for a mechanism to dynamically disable cores in Linux in order to minimize power consumption. Unfortunately, disabling cores using the following simple approach actually increases power, ...
4
votes
1answer
601 views

Difference between suspend to “mem” and pm-suspend

What is the difference between echo "mem" > /sys/power/state and pm-suspend Both can put the computer to sleep mode. I want to execute a script automatically when the system resumes from ...
2
votes
1answer
153 views

How can i see list of powered devices in my laptop?

I want to see all powered devices. I know about powertop. But that can't recognize device that isn't truly used. For example, my networkmanager is badly configured and wifi is powered on, i don't use ...
0
votes
0answers
160 views

Macbook (refit triple boot) always in powersaving mode under linux, is it the bios?

I have a macbook pro with a triple boot with refit and mac/debian/win7, It worked fine for a while. But now, when I'm in the refit menu or on debian, the screen is always on power-saving mode (like ...
0
votes
1answer
342 views

Is possible to lower power consumption at new Kernel 3.2?

I'm currently using Kernel 3.2, but i'm don't like it's high power consumption. Is there any way to lower it. I'm currently using Arch. But i'm not afraid of gentoo where almost everything gets ...
2
votes
2answers
1k views

How do I stop KDE from dimming the screen while mplayer is fullscreen?

Whenever KDE (I think) detects no mouse or keyboard activity for a while, it dims my laptop screen, then turns it off. I don't want that when I'm watching a movie. Is there a setting somewhere to ...
3
votes
1answer
873 views

Understanding battery information

My laptop is Lenovo T400 and OS is Ubuntu 10.10. Here is information about my battery: $ cat /proc/acpi/battery/BAT0/state present: yes capacity state: ok charging state: ...
4
votes
1answer
1k views

How can I tell Windows or Linux to put a specific (PCI[e]) device into sleep/off (D3) state?

How can I tell Windows or Linux to power a specific device (e.g. USB controller, network card, video card) down, that is put it in the D3 state? From the very little I know about ACPI and such, the ...
2
votes
3answers
625 views

Power optimization in Linux

I am working on a traffic surveillance project which performs various image processing tasks with a number of visual sensors and a computing platform. My basic task in the project is the power ...
31
votes
3answers
23k views

How do you check how much power a USB port can deliver?

Some laptops have a special USB port that can deliver more power than the other ones. However it is not always easy to identify which one is the good one, nor how much power it can deliver. So is ...
1
vote
1answer
2k views

How to make a linux laptop switch off backlight completely when keyboard and mouse is not used

On a couple of Linux laptops I have the built in screen never turns off it's backlight, regardless if a 'black screen' sort of screen saver is activated (this both for a laptop running an X-based ...
1
vote
1answer
505 views

Run xscreensaver whenever the lid is closed

How can I run xscreensaver whenever the lid is closed? I'm running Ubuntu 10.10 with the awesome window manager.
0
votes
1answer
571 views

How to disable automatic power-off on linux?

I need to disable the automatic power-off on shutdown so I can just withdraw the power myself. The reason for this is that the machine should power on itself when it gets power (which is accomplished ...
3
votes
2answers
700 views

Using different SSDs types (not only SATA based) as system drive

Currently I have a Thinkpad X61s and want to make it both a bit faster and a bit more power efficient. For that reason I thought that adding SSD drive would make most sense. Unfortunately, because of ...
3
votes
2answers
804 views

power management of USB-enclosed hard drives

With a typical USB hard drive enclosure, is the full range of drive power management functionality available? In what may be an unrelated matter: is it possible to suspend a PC without unmounting an ...
1
vote
4answers
2k views

How can I automate my Linux computer to power off (and on preferably) under certain circumstances?

OK, So a little background; I've been using Windows Home Server as a Backup Appliance, Media Server and Share Server at home for some time. I decided it was costing me allot of juice so very early on ...
0
votes
2answers
1k views

how to make LXDE hibernate the computer when the power button is being pressed

How to setup LXDE (a linux desktop environment) to hibernate a PC after the power button on the computer is pressed?
0
votes
1answer
753 views

Which Linux kernel modules are related to heat, fan speed, and power management

Which Linux kernel modules are related to fan speed, temperature monitoring and power management. The goal of my question is to provide a starting point for understanding which Linux kernel modules ...
3
votes
1answer
1k views

No Really Centos - Don't go to sleep

This is driving me nuts. I have the gnome settings in my CentOS 5.2 installation set to never go to sleep. But everyday I go away and come back in a few hours and the monitor is asleep and I have to ...
0
votes
1answer
376 views

gnome power manager - autosleep if keyboard/mouse idle for time X *and* CPU idle for time Y

I often set my computer to doing calculations that are going to take a long time, and then leave the room and go do something else. The GNOME desktop's power manager only seems to pay attention to ...
2
votes
3answers
2k views

Linux program to artificially create CPU usage

Since I own one of those Centrino based Core 2 notebooks that create annoying buzzing noises when idle (= entering C3 or C4 power saving states), I'm looking for a program that creates artificial CPU ...
2
votes
2answers
3k views

Making Ubuntu Sleep When Laptop Lid Closes

I am a brand new user of Kubuntu 10.0.4. So far, one of the major things I miss is the ability to have my system sleep when I close the lid of my laptop. Any tips on how to enable this behavior? ...
4
votes
1answer
139 views

Linux: Real-time Battery Power Usage

Is there a package for getting an accurate reading on the current total battery power usage in Watts on any system?
2
votes
2answers
2k views

Is there a way to start a Linux machine automatically?

On Mac machines the user can schedule the machine to power-on automatically, is there anything for Linux that gives us the same ability? I can schedule shut downs whenever I want, it's powering up ...
6
votes
1answer
844 views

Can you hibernate/reboot in Linux instead of hibernate/poweroff?

I'm using pm-hibernate, and would like to reboot the machine after it's done hibernating, rather than having the machine turn off. Is there a way to do this with pm-hibernate, or any other Linux ...
3
votes
2answers
5k views

Disable Power Management in Fedora 12

How to disable the power management in fedora 12, so that lcd/monitor should not go to sleep/off when system is idle?