Questions related to power management, particularly power saving measures.

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0
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2answers
115 views

Changing screen Brightness with a script

As you may know, screen brightness drains battery, that's why it is considered a big problem for laptops (at least for me). I can change the screen brightness but every time ubuntu boots up I will ...
1
vote
0answers
102 views

hibernate doesn't work xubuntu 14.04 [closed]

I cannot get my laptop to hibernate. This gets asked a lot here and I have tried many of the solutions to no avail. When I use sudo pm-hibernate, not much happens. the screen goes black for a quarter ...
1
vote
0answers
23 views

How to manage battery and AC on Lenovo [duplicate]

I own a [Lenovo Z410][1] laptop, and its battery is not removable. Lenovo published an ['energy management' driver for Windows][2] that let you to use ac power instead of battery when the battery ...
3
votes
4answers
4k views

DisplayPort monitor not detected if switched off and on again

I am running Ubuntu Desktop 14.04 on a desktop PC with a Nvidia GTX 660 connected to a HP LP2475w 24" monitor over DisplayPort. It boots up fine, but if I switch off the monitor and switch it on ...
0
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0answers
57 views

Ubuntu Battery Issues

I'm using Ubuntu 14.04 on an Acer 5750g (CPU i5 2410m, Gt540 M, Samsung Evo840 SSD) I've been experiencing problems concerning temperature, battery life and (thus I guess) CPU usage. I've installed ...
0
votes
1answer
31 views

Server 14.04 on a laptop?

I have a Dell E6320 that I recently installed Ubuntu Server on after a motherboard failure. However, since installing Ubuntu, I noticed that the battery refuses to charge. I know the battery is good, ...
0
votes
0answers
100 views

DPM on ATi Radeon 4250 in Xubuntu 14.04.1 is not working

I have notebook HP 625 with ATi Radeon HD 4250 on Xubuntu 14.04.1 LTS and DPM function is not working. In my case it should be work without to do anything, but not. Why?
0
votes
1answer
282 views

My computer shuts down suddenly

I have a little but annoying problem with my laptop. For quite some time my Asus K53SD (Xubuntu last LTS) 64 bits is shutting down without any demand when it have about 50% battery. I checked the ...
1
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0answers
25 views

How can i use powertop to save power utilized in a perticular variable

I want to access the power utilization in c code and save it to some variable. is it possible using power top
0
votes
0answers
124 views

Laptop Battery is not Charging

I am running Ubuntu 14.04 on a Lenovo IdeaPad Y510 which works fine when the charger is plugged in, but does not run at all on the battery. The battery has not been charging for at least 6 weeks. The ...
0
votes
0answers
53 views

Reboot on power off

Whenever I try to powerdown my laptop from the menu or terminal it powers off. Then three seconds later it starts powering back on. How can I fix this? I have the acer aspire v5-571. ...
0
votes
1answer
245 views

How to set radeon power low

So I used to be able to do what this page recommends for <= 3.10.x and set my radeon power_profile to low, but that seems to no longer work. For example: sudo bash -c "echo \"profile\" > ...
0
votes
0answers
149 views

Gnome Power Management: Automatic Suspend & Screen Shut Off Settings Not Working

Lately, Ubuntu has not been shutting off my laptop's screen or suspending it after the time defined under Settings>Brightness & Lock and Settings>Power, respectively. I tried reinstalling ...
0
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0answers
16 views

ENERGY MANAGEMENT ERROR

I'm getting the following system error: "Unable to initialize the system's power management KDE. The support system reported the following error: Not available valid additional support energy ...
0
votes
0answers
71 views

Brightness and Power management

I'm using Ubuntu Gnome 14.04LTS. I want to tweak my Brightness setting to consume long battery life.I want to have 100% brightness when Im on Plug and 50% brightness when Unplug However when I go to ...
1
vote
1answer
125 views

Ubuntu 14.04 battery drainage when shut off

I have Ubuntu 14.04 installed on a Lenovo Thinkpad T430s. The battery management worked fine until about 2-3 weeks ago. Now, however, my battery drains faster, even when the laptop is shut off. In ...
0
votes
1answer
526 views

Charging ignores TLP settings

Thinkpad E430, Ubuntu 14.04 LTS I set the thresholds for charging to 85-93% in /etc/default/tlp , restarted the computer. Now it is at 99% and charging. sudo tlp stat shows that it has successfully ...
0
votes
0answers
171 views

Power Management Problems

I can't disable the power management stuff in 14.10 at all. It will let me uncheck the boxes, but as soon a I go out and go back in the setting are back on. It will not save the settings at all. I'm ...
0
votes
0answers
129 views

Charge discharge behavior with thresholds set in TLP

I installed TLP for setting charging thresholds(lower:40% - upper:50%, for battery longevity) in my L440 Thinkpad laptop running Ubuntu 12.04.4 LTS. I have been monitoring my battery status ...
1
vote
0answers
116 views

Lubuntu 14.04 Session loss upon screen locking and power management issues

When I screen lock (ctrl + alt + del) on my Lubuntu 14.04 LTS system, my session is restarted when I log back in. This causes me to lose any programs I had running prior to the lock. Power management ...
0
votes
0answers
30 views

HDD standby mode does not turn on automatically [duplicate]

I have added the following lines /dev/hda { spindown_time = 60 } /dev/hdb { spindown_time = 60 } /dev/hdc { spindown_time = 60 } to the end of my /etc/hdparm.conf file and rebooted. ...
1
vote
0answers
102 views

Battery not detected, /proc/acpibattery empty even it is present

I'm using Ubuntu 14.04 and it is fully up-to-date. But the battery of my laptop is never detected. There is no battery icon on the top bar, the /proc/acpi/battery is empty. I've tried to remove the ...
0
votes
0answers
32 views

Battery Meter Inconsistent and drains rather quickly

I'm presently on Ubuntu 14.04. I just migrated here from LinuxMint Quiana. My battery meter doesn't indicate when the power cable has been plugged in or removed. I can't tell if my battery is ...
0
votes
0answers
29 views

How does one redefine the suspend command in ubuntu?

I am finding myself in need of redefining the behavior of the standard suspend command provided by ubuntu. What is happening is that because of some off hardware, the normal suspend command nor the ...
1
vote
1answer
463 views

“Battery not present” Dell Inspiron 14-7437 [Kubuntu-14.04]

I'm running Kubuntu 14.04.1 LTS AMD64 on my Dell Inspiron 14" 7437; it is a fresh and fully updated installation. What happens when I turn on my PC without the power cord attached is that KDE systray ...
1
vote
3answers
253 views

hibernate-disk command is failing to hibernate without producing any errors or helpful debug output

The behaviour I see after running sudo hibernate-disk -v4 is a bunch of output, followed by a switch to console, which prints a few lines, ending with "Preallocating image memory..." and then a switch ...
0
votes
0answers
50 views

turn off screen only labtop is on battery power

I am using Ubuntu 14.04 I would like that the screen does not turn off on inactivity when my labtop is plugged in, but it should turn off on inactivity when my laptop is on battery power. I can make ...
2
votes
1answer
78 views

Ubuntu doesn't save state after hibernation

As of yesterday, I had been using Ubuntu 14.04 with a 3GB swap-space. However, I was finding that I was unable to hibernate if I had more than 3GB of RAM in-use. So, I booted on a LiveUSB of Gparted, ...
0
votes
0answers
23 views

Hibernate not available [duplicate]

I found the following tip to save battery-life of my laptop while (not) using Ubuntu: "Use Hibernate rather than suspend power features" System -> Preferences -> Power Management -> On Battery Power ...
0
votes
0answers
44 views

How to keep the screen alight all along

I'm using ubuntu-mate, the power management doesn't work. I've set it to never close the screen, but it always set the screen off after 5 minutes when idle. Is there any another method to set it? Is ...
3
votes
1answer
904 views

KDE power management system could not be initialized

First of all, apologies but I am very new to using kubuntu, so I would need a very basic step by step answer to solve this problem. Since my last update I am getting this error message: KDE power ...
0
votes
0answers
10 views

Battery Drain Issue! [duplicate]

I am using dell inspiron 15r n5110 laptop,which comes with windows 7 by default. With windows,I can use it for 2.5 hrs(average). But on Ubuntu its just 1.5 . What could be the possible ...
2
votes
3answers
155 views

How to make Ubuntu shutdown when power lost?

My project requires that the power source for the laptop be switched on and off. Is there a way to make Ubuntu shutdown properly when the external power is lost? It will run the shutdown on its ...
0
votes
0answers
72 views

vm writeback timeout not work on ubuntu 14.04

I install Ubuntu 14.04 on my notebook, I use Ubuntu minimal a try to add /etc/sysctl.d/dirty.conf with vm.dirty_writeback_centisecs = 1500 but powertop white BAD and cat ...
0
votes
0answers
45 views

What is power.d hook do i need add example power.d hook in /etc/pm/power.d/

Recently after reading article on reducing power on https://help.ubuntu.com/community/PowerManagement/ReducedPower I installed pm-powersave. then I run command sudo pm-powersave true. Would this work ...
2
votes
1answer
379 views

How to disable power off/restart option on lock screen?

When I'm lock the screen it's possible to turn off computer or restart it. How to disable this possibility? This possibility on lock screen makes all lock screen idea no sense.
0
votes
1answer
330 views

Critically Low Battery Notification not showing in Ubuntu 14.04.1

Ubuntu is not showing the notification if there is a critically low battery. I already tried this reinstalling libnotify-bin notify-osd, but that didn't help. I am using a dell Inspiron 15 3537 ...
1
vote
2answers
172 views

Battery drains so fast

I have an HP laptop. It is a 64 bit machine. But I have installed 32 bit Ubuntu 12.04 presently. My problem is, once the battery is fully charged and start using Ubuntu it gets drained completely ...
0
votes
1answer
270 views

HP Pavilion G6 Won't Suspend with Ubuntu 14.04

My HP Pavilion g6-2268ca with Ubuntu 14.04 won't suspend. when the lid shuts the fan never cuts off. i've checked my settings under power management and everything looks good. when I manually click ...
1
vote
1answer
3k views

How to get xfce4-power-manager to work in Lubuntu 14.04?

I've had nothing but issues with it. On install, everything went fine, but I couldn't modify the lid action, and the suspending was very buggy - sometimes it worked, sometimes not. Then I found out ...
4
votes
2answers
373 views

How to get a notification when computer is not charging?

My laptop battery sucks, and lasts up to 5minutes without charging. Sometimes the charger falls out without me knowing, making the computer shut off unexpectedly. Is there a way to get a notification ...
-1
votes
1answer
250 views

Notebook keyboard gets hot only on the left side!

I have the Asus VivoBook S551lb, a thin notebook, with intel i7 4500u 1.8 ghz , intel 4600m internal graphics, and nvidia 740m discrete graphics. It looks like the fan placed in the left side , after ...
0
votes
2answers
24 views

File swipped away after power faliure

We are bunch of guys (9) working on a project. All of us save our files to a single computer which has windows share enabled on the project folder. There is a problem of power cut out in our place and ...
0
votes
2answers
137 views

Ubuntu and battery life

Currently I'm using a Netbook (Dell Latitude 2100 non-touch scree) (2GB RAM, 1.6GHZ Intel Atom Processor, 60GB HDD, originally Win Vista Business, currently WIndows 7 Pro and a windows experience ...
1
vote
1answer
166 views

Computer not suspending when inactive in the main log-in prompt

My computer is set to automatically dim the screen and lock after 10 minutes, and suspend after an hour of inactivity. That works fine - but only once I've logged in. If I switch the computer on and ...
0
votes
0answers
82 views

Ubuntu 14.04 upgrade won't suspend

I have upgraded to Ubuntu 14.04, since then my computer won't suspend. When I click suspend from the menu it just goes to a locked screen. It is using up my battery. I have to totally close down ...
1
vote
0answers
99 views

USB 3.0 ExternalEnclosure Unmounts at random

Title says it all. I noticed the drive was unmounted, so I got to looking through dmesg and found: [31080.516164] usb 4-3: USB disconnect, device number 3 [31080.760493] usb 4-3: new SuperSpeed USB ...
1
vote
1answer
278 views

Horrible battery life with Ubuntu 14.04 on ThinkPad

I've purchased a Lenovo ThinkPad S540, which has according to Lenovo '9 hours of battery life'. I was really happy when I tested the device running Windows 8.1, and the battery worked for 6 hours. But ...
0
votes
2answers
217 views

How to lock without turning the screen (monitor) off?

Due to a recent bug, each time my screen turns off, I cannot get it back on. Currently, the screen starts turning off after the computer is locked - which effectively means that I cannot lock my ...