Questions related to power management, particularly power saving measures.

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Ubuntu (14.04) freezes on laptop when disconnected from power

I have Ubuntu 14.04.1 installed along windows 7 (dual boot). My laptop is a HP Compaq 6710b which has an Intel CPU and an Intel graphics card. When I boot my laptop on the power adapter, no problems ...
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5 views

Power management policy for all users

I have a machine with one administrator user and one standard user. Is it possible for the admin to set a power management policy (suspend after 30 minutes of inactivity, for example) that the ...
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12 views

Ubuntu (14.04) freezes on laptop when power not inserted

I use Linux Mint 17 Qiana (on Ubuntu 14.04.1). My laptop is a Dell Inspiron M5110 which has an AMD CPU and an AMD graphics card. When I boot my laptop on battery, no problems occur. When I boot my ...
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16 views

Ubuntu 14.04 battery issue on dell inspiron 5521 [duplicate]

I have been experiencing issues with my battery, it only charges upto 86%, it drains normally, and also sometimes it shows wrong remaining times (like 90hrs) and i cant calibrate it since it doesnt ...
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1answer
21 views

How to repair powerstate (intel_pstate) on Intel Haswell chips?

I recently installed tlp on my Lenovo U430p laptop. After I runned it I noticed significant drop in my laptop's on bettery time. Now my laptop lasts on battery for 2 hours less than before. After ...
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1answer
38 views

Turn power OFF of USB Ports - Ubuntu 10.04 machine

I have Ubuntu 10.04 based portable touchscreen computers at workplace and sometimes people would use USB data cable to charge their phones from the USB port. Now I have usb storage access disabled ...
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1answer
19 views

Controlling Fans on an HP Probook 4525s

I would like to simply set my fan to run at 100% speed all the time. Is there any way to do this without fancontrol? Is there a way to physically make the fan run at all times (external power?) or ...
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28 views

TLP + PHC seem not to work after resume from suspend

I installed TLP 0.6. I also have kernel 3.14.2 with the PHC module for Ubuntu 14.04 (which is what I use). It seems to work when I reboot. The temperature is low. But after I resume from suspend the ...
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22 views

Lenovo Yoga 2 Pro and Ubuntu 14.04: Power display not updating

The percentage and remaining battery time display on the top right do not update on my Yoga 2 Pro that is running Ubuntu 14.04. However, if I click on the battery and Power Statistics program starts, ...
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2answers
23 views

Cannot Keep Ubuntu Server running on a laptop despite workarounds

I have ubuntu 14.04.01 server. I have edited /etc/systemd/logind.conf and changed to HandleLidSwitch=ignore saved file then executed sudo restart systemd-logind I even rebooted the computer I ...
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30 views

Settings of Power type MAAS node for manage VMware esxi images

i create a maas-controller with 5 nodes and i manage these whit Vmware Vsphere . I am setting power type for virtual machine "virsh" but i don't use kvm and the qemu+ssh string does not work ...
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21 views

Which part of the kernel powers on/off USB ports? How - the internals?

Please refer to this post: Power on/off USB ports . It is one thing to blindly replicate the codes in a terminal and get the desired results. I wish to know which part of the kernel does this work, ...
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32 views

Just installed Ubuntu 14.04 Battery no longer charging past 70%

thanks for the help. I just installed Ubuntu, and it was working fine yesterday. I just fixed my internet connection speed, but now my battery is stuck at 70% charged. It has a symbol that says its ...
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43 views

Battery issues - suddenly critical level [Ubuntu 14.04]

Since a week I'm experiencing sudden drops in battery level: it will be around 50-60% and suddenly drop to less than 10% and I get the message the battery level is critically low. Sometimes it doesn't ...
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16 views

Power Statistics in Ununtu 14.04 shows me battery percentage = 0%. How to fix it?

in the past days I killed my netbook while booting, then I found that I can't turn it on unless it's connected to AC power. Power statistics tells me the battery is charging, the time to full is 0, ...
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1answer
55 views

14.04 - Laptop Battery Indicator does not show the right battery percentage

Despite my battery is full; the battery indicator shows it as '98%'. When I click on it it says "Battery(charged)". Is this a bug? And how can I resolve this issue? psi. My laptop is new & I do ...
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1answer
38 views

Dell XPS 13 Ivybridge, turns off randomly when on battery

My laptop works perfectly when it's plugged in but when I am on battery, it will turn off randomly. Usually after 2 or 3 hours but not always. It will occasionally not turn off but freeze completely. ...
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38 views

Cuttlefish #!/bin/bash not working 0.o

I was running Cuttlefish on Ubuntu 14.04 with 2 scripts to dim and un-dim my screen when AC power changes to battery and reversed. I reinstalled today and can't make the script dimming or un-dimming ...
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1answer
46 views

“Battery critically low” on desktop

I installed Ubuntu 14.10 on a Lenovo Thinkpad, which is a All-In_One Desktop without any batteries. System is working fine, up to 2 problems: Shortly after logon, the desktop is shown and even a ...
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194 views

Ubuntu 14.10 does not power off after shutdown

I'm running Ubuntu 14.10 on my Dell Inspiron 15z (5523) which until last week was running normally. Now after selecting to shutdown or restart it does not continue -eventually some output (as per ...
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75 views

After upgrade to 14.04 resume from supend fails with freeze

I upgraded my HP Probook 4730 from 12.04 to 14.04. (Graphics: Radeon HD 6400M/7400M Series, Driver: fglrx_pci). Under 12.04 suspend and resume worked mostly fine, but now its really broken: resume ...
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1answer
48 views

Power Presets - Ubuntu 14.04

Hello Ubuntu Community, On Windows, I was able to set different power plans ("Never Off", "Charging", etc.) which allowed me to change suspend/screen turn off settings with the click of a button. ...
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15 views

How not to spindown HDD on suspend?

I have a Self-Encrypted Drive (SED) that needs to be NOT spinned Down on suspend (otherwise when I resume, the HDD is in lock state ... which prevent the kernel to work !) I've been trying to find ...
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1answer
45 views

WIreless USB mouse does't work when laptop is on battery

I have a problem with my wireless USB mouse while working on battery. When laptop is plugged into power source mouse works pretty well. The problem started after I run some script that aimed to tune ...
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2answers
92 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 ...
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44 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 ...
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0answers
20 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 ...
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42 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 ...
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1answer
26 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, ...
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26 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?
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1answer
72 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 ...
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17 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
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58 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 ...
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32 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. ...
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1answer
47 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\" > ...
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35 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 ...
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10 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 ...
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47 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 ...
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1answer
64 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 ...
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1answer
118 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 ...
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103 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 ...
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49 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 ...
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65 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 ...
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0answers
26 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. ...
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0answers
46 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 ...
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21 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 ...
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25 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 ...
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1answer
133 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 ...
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3answers
81 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 ...