Questions related to power management, particularly power saving measures.

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0
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1answer
21 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 ...
0
votes
1answer
31 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. ...
-1
votes
0answers
30 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 ...
4
votes
2answers
543 views

How do I detect when my system wakes up from suspend via DBus or similar in a python app?

In a background Python script I need to detect, when the system just woke up from suspend. What is a good way that does not rely on a root script but rather on python modules such as DBus? I'm new to ...
1
vote
0answers
161 views

Xfce power manager in Xubuntu 14.04 doesn't react to my choices

Okay, so I chose to make it so that when my laptop lid closes and I'm on AC (my power cord is plugged in) it will do NOTHING. But when I close my laptop lid .. it just suspends. I've tried it like a 8 ...
6
votes
3answers
1k views

How do I set the computer to suspend when battery is critically low?

I accidentally clicked on the option "When power is critically low" under System Settings>Power. The original entry was blank, but the only two options after I clicked were Hibernate and Shutdown. I ...
0
votes
1answer
25 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 ...
2
votes
2answers
2k views

Intel Corporation Wireless-N 7260 card dies randomly

On Ubuntu 14.04 32bit, after some up-time my wireless card stops working. Sometimes it helps to stop WiFi in the nm-applett (at the top right corner) and restart it to get a new connection to my WiFi, ...
2
votes
2answers
3k views

Ubuntu 12.04 LTS drains my Samsung Series 9 900X3C ultrabook's battery extremely fast. Is there anything I can do to fix that?

The title basically says it all. My Samsung Series 9 900X3C ultrabook's battery is in the deep red around barely three hours after disconnecting it from the power - and during most of that time the ...
0
votes
0answers
88 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 ...
4
votes
1answer
86 views

Prevent machine from sleeping when SSH connections are on

I am trying to save power by switching desktops to suspend mode when they are inactive. But many desktops are also accessed via SSH by their owners. There is a wakeonlan solution deployed to enable ...
0
votes
0answers
53 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 ...
13
votes
5answers
44k views

How do I disable my system from going to sleep?

I am getting a web server setup at home on an older AMD 2400+ desktop. I have Ubuntu 11.04 installed and running however, after a time, I can no longer browse to the server. When I go to the keyboard ...
0
votes
1answer
35 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. ...
2
votes
2answers
2k views

Disable USB keyboard wakeup

With the update from 11.04 to 12.04, my USB keyboard activity will wake Ubuntu from 'suspend'. I'd like to disable this. (My battery went dead due to some unexpected keyboard activity.) This didn't ...
8
votes
2answers
1k views

How do I get a wireless USB keyboard to to wake Ubuntu 13.10 from suspend?

My PC with Ubuntu 13.10 is set to suspend after 30 minutes of inactivity. Up until it suspends I can resume working at any time using my Logitech K400r wireless USB keyboard. The OS defect/problem ...
0
votes
1answer
30 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 ...
0
votes
0answers
10 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 ...
0
votes
1answer
70 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 ...
3
votes
6answers
5k views

Brightness control doesn't seem to work on a Toshiba Satellite M115 laptop

I have Ubuntu 12.04 LTS on a Toshiba Satellite M115 laptop. The brightness control doesn't seem to work with the "brightness and lock" setting or fn+f6 and fn+f7 (which usually works in Windows). How ...
1
vote
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 ...
1
vote
0answers
30 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 ...
9
votes
2answers
1k views

How to control LightDM power saving preferences?

I want lightdm to enter power save after a specific period of time. If I'm logged in then my screen will time out as per the user settings, however when no one is logged in the screen will stay on ...
4
votes
2answers
2k views

How to shutdown Ubuntu after (2 hours) of idle?

Running: Xubuntu 14.04 32bit. I have read several outdated, not working, working different that I want answers here and elsewhere. I had a script that resulted in shutting my Laptop down at boot time ...
6
votes
2answers
10k views

Power on/off USB ports

Is it possible to on/off specific usb port using terminal in ubuntu? lsusb displays the following result Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub Bus 002 Device ...
0
votes
0answers
30 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
56 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 ...
0
votes
1answer
25 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
20 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?
1
vote
0answers
15 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
37 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
30 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
39 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
26 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
votes
1answer
55 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 ...
-1
votes
0answers
18 views

Using suspend-to-disk instead suspend-to-ram

when i close the lid of my notebook ubuntu went into suspend-to-ram. After opening it is very quick ready to work. But i have many problems (discussed in other threads) with waking up, mouse and ...
0
votes
0answers
9 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 ...
1
vote
1answer
71 views

How do I get a warning before my laptop powers off?

In previous versions of Ubuntu, when my laptop battery hit somewhere around 20% power, the icon in the Gnome panel (I use Flashback) would turn red. Also, there would be intermittent warnings telling ...
0
votes
0answers
42 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 ...
0
votes
1answer
68 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
64 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 ...
1
vote
3answers
71 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
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. ...
1
vote
1answer
75 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 ...
0
votes
0answers
31 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 ...
3
votes
1answer
155 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 ...
1
vote
2answers
430 views

Lenovo X1 Carbon with Ubuntu 14.04 wakes from suspend by itself after 3 hours

My machine seems to wake up from suspend by itself, at irregular intervals. Causing the power to die out, and machine turn off. It is quite the annoyance, when the machine is in my case and it wakes ...
1
vote
0answers
55 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 ...
1
vote
0answers
35 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
1answer
107 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 ...