Questions related to power management, particularly power saving measures.

learn more… | top users | synonyms (1)

5
votes
1answer
85 views

Notebook wakes up from Standby

I have an Acer Aspire V5 Notebook with Ubuntu 14.04 installed on a SSD an Windows 8.1 on a HDD. I experience that my Notebook wakes up from standby randomly after a certain time (can be a few ...
0
votes
0answers
27 views

battery is not being charged or used

My battery is 89% charged, but as soon as I pull out the power cord from my laptop the laptop electricity supply is killed (and the computer shuts down). Here are my battery stats: So basically, ...
1
vote
0answers
49 views

Ubuntu getting suspended 5 seconds after showing log on screen

Ubuntu getting suspended 5 seconds after showing log on screen. After I wake it, there is no problem. In log I noticed a mem sleep initiation. also the problem was there when I chose try Ubuntu at the ...
0
votes
1answer
45 views

Wifi power management turns back on when connecting

I've been having wifi connectivity issues, and I've narrowed the problem down. Wifi power management seems to mess with my connectivity. I can turn it off with: sudo iwconfig wlan0 power off But ...
0
votes
1answer
38 views

Automatically shutdown when switching to battery

I'm recently made my old laptop into a server using Ubuntu Desktop 15.04. But because my laptop has an almost dead battery I want Ubuntu to save all data that it's on (or at least close the running ...
0
votes
1answer
101 views

Unable to load tp_smapi on Thinkpad w541

I have a Lenovo Thinkpad w541 with Haswell Procesor (i7-4810MQ ). I am unable to load the a Thinkpad module for battery improvement. joselugo@joselugo:~$ sudo tlp-stat -b --- TLP 0.7 ...
0
votes
0answers
20 views

to to set /sys/bus/usb/devices/…/power/ ON by default on all the USB devices?

I have about 9 USB devices plugged in. The issue is that when I add more they sart to disconnect inconsistently. After some research I've found that /sys/bus/usb/devices/.../power/ [0] could be the ...
1
vote
0answers
50 views

Ubuntu 14.04 turns off after unplugging the charger

I have problem with my Ubuntu 14.04. Every time I unplug the charger, the system is shutting down. It occurs only, when the charger is unplugged from computer, but not when unplugged from the power ...
0
votes
0answers
38 views

CPU frequency reset to maximum value by unknown process

I run the following Bash script to set the CPU frequency to idle at a lower speed: for i in $(seq 0 7) ; do sudo cpufreq-set --min 1200000 --governor conservative --cpu $i ; done I can then monitor ...
0
votes
0answers
29 views

CPU Governor Not 'Idling' After Kernel Update

Last night, my laptop running Ubuntu 14.04 asked to update the kernel to 3.16.0-43. I noticed this morning that Conky is now reporting that my CPU is running around max all the time now. Before ...
2
votes
1answer
65 views

systemd: How to modify the HandlePowerKey action with a custom command?

My headless server has a power button. When the user presses it, I want the server to respond with a brief beep, then shutdown the server. The system should only beep when manually pressing the ...
1
vote
0answers
33 views

what command can maximize power saving and half the processor speed for Ubuntu software TLP

I've recently installed Ubuntu 15.04 alongside windows 7. I gave 30gb disk space for Ubuntu. I've also installed TLP for power management. Now what command do I have to maximize power saving, reducing ...
0
votes
0answers
63 views

Error after suspend/resume. Ubuntu 14.04

When I close a lid of my laptop and open it up, I've got errors after suspend/sleep mode and then normal login screen. There are something like "unclaimed register writing to ...", "error 19 on ...
0
votes
1answer
15 views

Ubuntu locks laptop at 3% battery

Alright, So I let my laptop's battery drain to 2% battery before pluging it into the charger to recharge but ubuntu acts funny around 3% and only 3%. When it gets that low, it locks my laptop to ...
1
vote
0answers
19 views

Why can't I select Suspend as on-lid-closed action for AC?

When I go to "Power" and try to select "suspend" when laptop lid closed, on AC power, I find that suspend is greyed out, disabled. I don't understand why. Suspend works fine when on battery. I'm ...
0
votes
0answers
23 views

Screen pauses every 7 seconds with Radeon Open Source Drivers

This is a clean install of 14.04.02 on my HP Laptop. The laptop,a dv7-4045ea, has dual Radeon graphics cards a HD4200 and a HD5650 which cannot be controlled in the BIOS and cannot use fglrx drivers. ...
0
votes
1answer
51 views

¨USB device: card reader¨ draining battery even if not used

Ive installed ubuntu on my macbook pro retina 13 and im triyng to get the best battery life possible. Im using powertop to manage what needs to be changed and pm-utils to save power. powertop says ...
0
votes
0answers
14 views

Intel P-State: Stuck at 900 Mhz after unplugging power supply, even if plugged in again

when i start my laptop without power supply or unplug it later, the frequenzy gets stuck at 900 Mhz. If i change the governor to performance it is stuck at 2.5 Ghz. After a restart it works as ...
0
votes
0answers
32 views

Ubuntu 14.04 desktop goes to sleep when issued “poweroff” command while lid closed?

My ubuntu version is 14.04 LTS. I used the following command to shutdown the system after a certain process was completed (This process takes a long time to complete, so I needed a way to ...
0
votes
1answer
28 views

Cut power to CD drive to save battery?

It is not a duplicate because the HDD in question is plugged into the optical bay. Here is my configuration: I have replaced my HDD with an SSD. Then I put the HDD in a optical bay caddy, and put ...
1
vote
0answers
84 views

Kubuntu 15.04 lock screen delayed after waking up

How to get rid of this? When I close the laptop lid, it suspends. But then, I open it, hit the power button to resume it, and I see my desktop (wow much secure). It is unresponsive, I can't click ...
0
votes
1answer
20 views

14.04 USBs powered off at login screen

I'm using Ubuntu 14.04 LTS with a Dell normal desktop PC. I've been suffering this issue from the very beggining. Randomly, the USBs ports seem disconnected/powered off at the login screen, before ...
0
votes
1answer
147 views

Kubuntu 15.04 doesn't suspend when closing lid

I recently installed Kubuntu 15.04 64bit on my laptop, precisely an Asus UX32VD (it has got 2 graphic cards, Nvidia geforce 620m and Intel). Everythings works fine as it was with Kubuntu 14.10, but ...
0
votes
0answers
17 views

Ubuntu 14.04 Unity The powert management module could not be loaded

I know there are similar questions but they are 5 years old and several are specific to KDE or Mint. The problem is that when I open the Power Management settings I can't do anything cause I get ...
1
vote
0answers
27 views

What is the script that executes soon after we plug in AC adapter?

My Dell Inspiron laptop's fan makes a lot of noise when i execute any heavy application process. The fan continues to make the noise till i plug in the AC adaptor power cord with power in. It ...
0
votes
1answer
57 views

How to change battery settings like in Windows. (Power saving, balanced, gaming)

Just got Ubuntu a couple of days ago because I wanted to try something new. I'm fond of gaming but I am also recently into programming. Sometimes I have a charger and sometimes I don't. Other than ...
0
votes
0answers
91 views

Disable dynamic power management for USB device in Ubuntu 15.04

In an attempt to diagnose this problem, I would like to disable dynamic power management for my USB headphones, but the kernel documentation for USB power management is not up-to-date, and these ...
1
vote
0answers
49 views

Screen Dimming Anomaly

My Lenovo G780 with Ubuntu 14.04 is fine when the AC charger is plugged in. However, when unplugged, if my mouse does not move for ~12 seconds, the screen dims a bit, but this is not detected by my ...
1
vote
0answers
58 views

Does the boot option acpi=off can overheat my laptop?

Help please (excuse my english) I recently bought an ASUS X453 (quad core intel inside pentium, 4GB RAM, 500GB Disk) and replaced Windows 8.1 with Ubuntu 14.04. After a lot of trouble with the ...
0
votes
1answer
30 views

Dead ID pin on DELL AC adapter, how can i run the CPU on 100% anyways?

I have a Dell D430 with Lubuntu 14.04 (if i'm not wrong about the version) installed. My power adapter failed with its ID pin, but it's powering the unit. I don't care of charging the battery, it will ...
0
votes
1answer
155 views

Samsung laptop running Ubuntu 15.04 shuts down at 30% battery without warning

My laptop shuts down suddenly at 30% battery when not charging. It does not show any warning. The screen turns black all of a sudden and I can only reboot after I've plugged in and started charging ...
1
vote
0answers
54 views

MacBook Pro 11,1 Magsafe connector gets hot

I've installed Ubuntu 14.04 on my Macbook Pro 11,1 and updated the kernel to version 3.19.8. I have a problem now. If I plug in the Magsafe connector the connector and the surroundings on the macbook ...
0
votes
0answers
65 views

BQ E4.5 r22: setup an alarm from a script run by user phablet or its cron job

I run in my BQ E4.5 Ubuntu phone a cron job which monitors every 5 minute the battery level. I'd like to be able to create an alarm let's say if battery is below 10% to get the users attention of the ...
0
votes
1answer
255 views

How to disable systemd-logind from handling lid close actions?Ubuntu 15.04

I want do disable logind from handling lid close actions, because my MacBookAir uses sometimes 45 seconds to suspend after closing lid. I have diabled this in settings editor in Xubuntu before, and ...
0
votes
0answers
66 views

Macbook Pro 11,1 strange suspend

I've installed Ubuntu 14.04 on my Macbook Pro 11,1 and updated the kernel to version 3.19.8. In my opinion everything works fine except Also I have a problem with suspend. Sometimes very strange ...
0
votes
0answers
36 views

Power options interface always shows as running on battery with 14.04

I've just completed a fresh install of ubuntu 14.04 and performed a complete update. My battery status indicator in the top menu bar always says that I'm running on the battery, even if it's plugged ...
1
vote
1answer
49 views

Indicator-Power-Message: exiting: service couldn't acquire or lost ownership of busname

Sometimes I see my battery indicator and sometimes I don't. I've attempted every fix in this thread with no results. I might have found the source of the problem, though. When I run ...
1
vote
1answer
33 views

APM best settings

I mean this one: What's the best setting for this? Best for performance. Thanks!
1
vote
0answers
45 views

Subscribe for DBUS event of screen power off

My MacBook Pro has a keyboard backlight which is pretty awesome, but there's a slight bug: the screen turns off after a given amount of time, but the keyboard backlight stays on. I've copied over ...
0
votes
0answers
35 views

Nothing happens when i press the power button

When i press the power button on my desktop it used to suspend but now it seems that nothing happens. Would the fix be under sudo gedit /etc/acpi/events/powerbtn? Thanks.
0
votes
2answers
141 views

How to disable Intel Display Power Saving Technology in Ubuntu 14.04

I am using Dell Inspiron 15 (3542, early 2014). There's an annoying feature which adjusts the LCD brightness according to what's displayed on the screen. When I was using Windows 8, I disabled it ...
1
vote
1answer
72 views

Ubuntu 15.04 - after hard power boot, it never comes back or it boots but then it does not behave correctly

I have a kiosk running with Ubuntu 15.04 64-bit, which is connected to a 47" screen, on boot it starts Google Chrome. Now the Ubuntu 15.04 needs to be powered off (6PM) and powered on (8AM). When ...
2
votes
1answer
130 views

Cannot detect power supply plug/unplug on Ubuntu 14.04.2

After plug/unplug power supply nothing happened, means battery icon does not have any reflect or when unplug power supply use battery until become completely empty without hibernate or even shut down. ...
13
votes
1answer
807 views

How to leave a usb port powered during shutdown for charging mobile?

My Sony VAIO Laptop has a feature which will allow me to keep one USB port powered even when my laptop is shut down. It is given in the manual here. It can be switched on or off from the Vaio software ...
1
vote
1answer
59 views

HP Envy Touch Smart 15 heat on bottom screen

I recently installed ubuntu 14.04 LTS, on my HP Envy Touch Smart 15 laptop. When running more than 30 minutes the bottom part of the screen (on the HP logo) getting unusual heat. It also can be feel ...
0
votes
0answers
36 views

What is wrong with the power management of my Aspire One 756

My Acer Aspire One 756 (AO756-2894) doesn't want to charge the battery. The battery might be dead. However plugged in and without the battery it seems to remember the state of charge of the battery ...
0
votes
1answer
222 views

How to save battery life in Dell Vostro 3446 (Ubuntu 15.04)

I have both Windows 7 and Ubuntu 15.04 on my Vostro 3446. I noticed that when I'm on Windows 7 I get easily 4-5 hours of battery life but when I'm on Ubuntu, it barely lasts 1.5-2 hours. I cam across ...
1
vote
0answers
66 views

MAAS Power-on problem IDRAC IPMI 2.0

I'm currently having a problem in getting MaaS (v1.7) to properly provision a Dell PowerEdge R630 server. The MaaS vm itself is able to detect the server automatically, and once the dell server boots ...
3
votes
0answers
59 views

Battery indicator disappears on connecting the power

I removed Unity and installed Gnome on Ubuntu 14.04. Now the battery indicator disappears on connecting power. The indicator-power-service appears to be there but it isn't working. On running it from ...
1
vote
2answers
104 views

How do I turn off battery charging in Ubuntu?

I mainly work on AC power. Therefore Windows has the below utility to improve battery life for my scenario by disabling battery charging: How do I achieve this in Ubuntu? Thanks in advance!