Questions related to power management, particularly power saving measures.

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How to power off discrete graphics card

I installed Lubuntu 16.04 to my HP Pavilion dv6 laptop which has AMD 6770M discrete graphics card. In order to save battery I want to power off AMD card since onboard Intel HD3000 is enough for me. I ...
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1answer
17 views

Undervolting CPU with ubuntu 16.04

I was looking into undervolting my laptop CPU. I could only find guides on phc that are said to be outdated. Is there a tool for that in the new version? Is it possible with TLP?
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1answer
30 views

how does exactly suspend works in ubuntu?

I like to know how exactly suspending proceeds in Ubuntu, Is any hardware completely cut from power or their process is just minimized? Other than the screen which parts are put on hold or their ...
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14 views

'Clearing orphaned inodes' and state lost on hibernation resume

I installed a fresh 16.04 LTS. I have been experiencing some problems with Wifi applet display error (after resume from Suspend) and with hibernation resume. I enabled hibernation on menu using the ...
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29 views

New to Linux as a programmer [on hold]

I am looking for a resource that will walk me through how to look at the code of Linux and then access or build a module that will access a communications module on a board and allow me to put it to ...
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1answer
19 views

Dell Power Managerment Drivers for Ubuntu 16.04

On Windows, Dell Power Management drivers are available for laptops for maximizing the health of battery. Due to drivers on Windows, Desktop Mode and Logetivity mode are available for maximizing ...
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1answer
20 views

With 16.04 my machine shuts down then restarts when battery level is critically low

I thought I had set my machine such that it would shutdown when the power was critically low on battery. In org.gnome.settings-daemon.plugins.power, I have set use-time-for-policy to false (i.e. no ...
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21 views

Card reader draining battery in Dell laptop?

I just bought a brand new Dell laptop and installed Ubuntu 16.04 on it. The battery started acting strange, i.e.: draining rapidly, and at times the system will shut down (when unplugged) even if ...
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19 views

Laptop sleeps even though sleep is disabled

I am running Ubuntu on a Lenovo IdeaPad Flex 10. The laptop is being put to sleep after 15 minutes of inactivity even though I have disabled sleep. In my power management settings I have set sleep ...
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25 views

Suspend not working on HP Pavilion g7

Suspend does not seem to work on my HP Pavilion g7, on which I have just installed Ubuntu 16.04 Xenial. I am not quite sure how to fix this, the issues on the internet usually relate to being able to ...
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1answer
35 views

16.04 - When Laptop is closed, the desktop changes to external monitor

When I close my laptop, I want that the laptop suspends. I already set the power settings to "suspend" like in the linked picture (language is set to german). But instead of going into suspend mode, ...
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33 views

Laptop doesn't suspend after closing lid

None of the solutions on here have worked for me. Recently I've installed Lubuntu. I'm getting used to DE (switched from GNOME), however, I have a problem with the power management (Lubuntu uses xfce4 ...
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1answer
36 views

Ubuntu ultrabook

I have a question considering ubuntu & ultrabooks. The problem is, a need a new computer. I'm looking for an ultrabook-like laptop which runs with long battery life (even under ubuntu) but I don't ...
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0answers
22 views

Battery capacity below 100% in Dell laptop and battery misbehaving

I just bought a Dell Inspiron 15 5000 laptop with a AMD A10-8700P CPU. I removed Windows 10 and installed Ubuntu 16.04. When plugged in, at random times, the battery icon will appear showing that the ...
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1answer
41 views

How to prevent Xubuntu from suspend?

Apparently, Xubuntu is totally unable to wake up. So when it goes to sleep, for whatever reason, you lose all usaved work. No Ctrl+Alt+F1, nothing. It is there, the machine is on, but the only thing ...
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48 views

indicator-power status change delay

I recently migrated to 64 Bit 16.04 LTS from 32 Bit 14.04 LTS on my Toshiba L645 laptop. I am facing an issue with power indicator on the unity panel. When I change the power source to battery from AC,...
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66 views

Hibernate does not work on Ubuntu 16.04?

I followed some threads here and was able to enable the hibernate button on the top right menu. But when I hibernate, my laptop screen goes off but the laptop is still running. I know that because the ...
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1answer
90 views

Stop monitor from going to sleep in ubuntu 16.04

I want to stop monitor from going to sleep in ubuntu 16.04. I am using /etc/X11/xorg.conf file in Ubutnu 14.04, which has below lines written in it. Section "ServerFlags" Option "BlankTime" "60" ...
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57 views

Ubuntu 16.04 - Black screen on Suspend, system doesn't suspend

When I suspend my system (desktop with only Ubuntu on it), the screen goes black but the fan is still running. The only way to get out of this state is to power cycle the computer, repair packages and ...
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52 views

(noob) Ububntu 16.04: Gnome makes battery life (a lot) shorter than Unity ? (xps 15 9550)

I'm really new to the Linux world. After a LOT of complications about setting up a dual boot win10/ubuntu, I've decided to use only Ubuntu 16.04 GNOME (for now). I've tried Ubuntu 16.04 too but I ...
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1answer
28 views

How to remotely power on nodes on maas 2.0

I wonder if anyone minds instructing me how to remotely power on a node on maas since on maas 2.0 wake-on-lan is no longer available on power type options you were able to choose from at the maas gui'...
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17 views

Auto stand-by HDD at startup?

I have 3 storages in my NB: 1. SSD with Ubuntu 2. HDD for data like downloads, movies, etc. 3. HDD with Windows which I use just occasionally since I installed Ubuntu I want to restrict activity of ...
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24 views

mouse stopping on power cord switched off [duplicate]

When the power cord is unplugged, the mouse just stops unless clicked. I have turned it to see the bottom surface and it is not switched on (no light), meaning that the power settings do something to ...
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1answer
133 views

Power meter ACPI000D:00: Ignoring unsafe software power cap

I get the following message on Ubuntu 14.04 during boot: power meter ACPI000D:00: Ignoring unsafe software power cap The message comes up shortly after the red/orange Ubuntu background appears and ...
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35 views

Can't hibernate 16.04 PowerEdge

I'm using LXDE on 16.04 via x2go. I have XFCE, MATE, LXDE, and Unity installed. The original install was 14.04 on an AMD Phenom x4, then I swapped the HDD into a Dell PowerEdge with a dual-xenon. I ...
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1answer
66 views

My HP laptop is over-heating after installing Ubuntu

I bought a new laptop a week ago (HP Pavillion 15-ab523tx) and I dual boot it with Ubuntu 16.04 along with preinstalled Windows 10. While running Ubuntu my laptop gets extremely hot.I read about it ...
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13 views

How to stop screen from sleeping after I lock my session? [duplicate]

First time posting here, so here goes ... I have Ubuntu 14.04 LTS and the issue I am having is that I want to prevent my screens from fading to black and powering down when I lock my session. ...
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17 views

MAAS custom power type

I would like to use MAAS in a custom environment. Actually, the servers are usual machines with netboot capability, however, the power (rack) controller is a linux box. I can login via ssh into the ...
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51 views

Ubuntu 16.04 Battery Drains to 50% in shutdown in 5-6 hours [HP pavilion Gaming Notebook]

I have a dual boot system with windows 10. I use ubuntu most of the time and in the night when i shut it down with 90%-95% battery. Next morning when i open up the laptop, the battery is drained to ...
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0answers
44 views

Ubuntu 16.04 saying battery discharging even after plugged in charger

I have plugged in charger and run following command: cat /sys/class/power_supply/BAT0/status It says discharging in both cases plugged in or plugged out. Even battery icon indicator is not changing ...
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136 views

Ubuntu 16.04 Black Screen After Suspend

I've seen this issue reported but have not seen a solution working for me. I did a fresh install of 16.04 and everything is working great. The only problem I'm having is when I close the lid on my ...
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1answer
49 views

Ubuntu 14.04 battery status unknown or 0%

I am using Ubuntu 14.04. Today all of a sudden when i turned on my laptop the battery was critically low and it logged off but i remember charging it to 100% the night before. When i logged on this is ...
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1answer
50 views

Freeze after closing lid. Suspend with pm-suspend works fine: Ubuntu 14.04 on Thinkpad T460s

When I call pm-suspend from a terminal, it works fine. But when I close the lid (on battery, which should suspend the system) and reopen it, the system freezes and the CPU spins a lot. By the way, I'm ...
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1answer
76 views

[TLP]-error: “tp-smapi = inactive (kernel module 'tp_smapi' not installed)” on thinkpad t460s

when I ask tlp for my battery status via sudo tlp stat -b I get the following status: +++ ThinkPad Extended Battery Functions tp-smapi = inactive (kernel module 'tp_smapi' not installed) tpacpi-...
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0answers
47 views

Insanely high battery discharge rate while charging

Having a strange issue with my battery meter in Ubuntu 16.04. I had the same issue in Debian, so it's possibly an issue with the battery itself, but let's see what you think. These are screenshots ...
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27 views

How To Have Record of Factors Affecting Parameters of Powertop?

The application powertop can show about power consumption. However, I would like to have a record about processes which affect those parameters because they change without my wish, most probably ...
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39 views

Cannot hibernate Ubuntu 16.04

I'm trying to enable hibernation on my Asus G501 but it doesn't seem to be working. I've followed a number of online resources like this one: https://help.ubuntu.com/lts/ubuntu-help/power-hibernate....
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1answer
209 views

Ubuntu 16.04 LTS black screen after suspension on Dell [duplicate]

I have a Dell Inspiron 15R with Intel® Ivybridge Mobile Graphics. I upgraded to Ubuntu vanilla and the latest version (16.04) few days back. Each time I close the laptop lid with the power source ...
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1answer
45 views

Samsung Battery Life Extender - limit battery charging to 80% under Ubuntu

Some of you may have used Easy Settings app that's provided by Samsung for Windows OS. Similar Samsung's tool for Linux OS distributions isn't available. I missed Battery Life Extender function the ...
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0answers
27 views

Pm-hibernate - doesn't work, or create log file

Preliminary ubuntu 16.04 dual boot on a disk that also runs windows 10 hibernate works in windows 10 swap partition is the same size as RAM Problem When I run sudo pm-hibernate from the terminal ...
0
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1answer
35 views

echo 1 > /sys/bus/pci/slots/$4/power bash: /sys/bus/pci/slots//power: Permission denied

On typing echo 1 > /sys/bus/pci/slots/$4/power, I get this error: bash: /sys/bus/pci/slots//power: Permission denied Here is the output of lscpi -vvon my system: 02:00.0 Multimedia controller: ...
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0answers
624 views

Ubuntu 16.04 won't shutdown

On my MSI GS60, when I try to power off Ubuntu 16.04 LTS the laptop will not shut down. Reboot works fine though. I have removed the quiet splash parameters for grub so I can see the output. When I ...
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0answers
29 views

Is there a way to disable sleep of a remote computer from command line?

It's an Ubuntu 12.0.4 computer that I have access only through ssh. How to prevent it from going to sleep?
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1answer
59 views

Battery information is wrong

I have replaced the battery in my laptop with a lower capacity battery than what was previously inserted. Ubuntu hasn't calibrated the battery metering system, and so the statistics & percentages ...
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0answers
23 views

Bluetooth loses connection with mouse in 14.04

recently i bought Thinkpad bluetooth mouse (OA36414) however, the mouse lose connection from my laptop (ubuntu 14.04) from time to time which troubles me a lot. I have read this enter link ...
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89 views

Power management, caffeine and crash problems-Kubuntu 16.04 [on hold]

I have installed kubuntu 16.04 about 2 weeks ago and I ran into tons of problems since then. I have suceeded in resolving couple of them but the ones listed in here are too much for me to handle. I am ...
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1answer
98 views

Ubuntu drains battery very fast on 16.04

I have Dell XPS L502X I have installed SSD of kingstone 120 gb After that i have i have installed ubutu 16.04 and my battery drain very fast at 100% charging work 1 hour and 13 minutes while in ...
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0answers
25 views

How to disable Bluetooth devices from turning off due to inactivity in 14.04

I am fairly new to Ubuntu. I know in Windows OS you can disable Bluetooth power management, which disables the devices from turning off/going to sleep. I would like to disable that for Ubuntu 14.04 ...
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1answer
186 views

Kernel build 4.4.0.22 decreases battery life (16.04 LTS)

My battery life was fine when I installed 16.04 LTS (clean install) on my Lenovo z51-70, but after a regular software update or build to kernel, from 4.4.0.21 to 4.4.0.22, it has almost halved (1.50 ...
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1answer
90 views

How to configure power managment with tlp?

I have a similar issue like this user, that is my hard drive overheats. I'm running Ubuntu MATE 15.10, which has tlp, and I've read that they should not be installed together. So is there a way to ...