Questions related to power management, particularly power saving measures.

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7 views

USB and PCI devices taking a LOT of power

So I ran powertop on my laptop and saw that I have a lot of devices that are draining power on full speed the whole time according to the program. As you can see there a lot of things taking 100% ...
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0answers
15 views

hibernation at critical battery level not work

I use this tutorial (hibernation enable) to put my Ubuntu 14.04 in hibernation. All works well if I put my notebook in hibernation manually. But I need at critical battery level it's put to ...
4
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1answer
28 views

Advanced power options for lid closing

I have ubuntu 14.04 installed on my dell e5440. What I'm trying to do is to make my computer suspend when I close the lid when I'm plugged in and hibernate when on battery power. What I've managed so ...
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1answer
6 views

tp_smapi on the Lenevo Thinkpad T440p (or just battery thresholding)

I'm trying to get the tp_smapi module working on my Thinkpad T440p for battery thresholding with tlp. However, when I run sudo tlp-stat -b it returns tp-smapi = inactive (kernel module 'tp_smapi' ...
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0answers
24 views

Ubuntu 15.04 suspend loop bug

I'm having the same bug as listed here: https://bugs.launchpad.net/ubuntu/+source/dbus/+bug/1450013 and here: When I install Ubuntu 15.04 the computer hibernates but changing to ...
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1answer
25 views

Battery suddenly not charging anymore

I have a relatively new ASUS F451MA. I had already updated the BIOS to the latest version before the problem appeared. I have opened up my laptop and tried to reset the battery by taking it out and ...
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0answers
37 views

Ubuntu 15.04 Suspend not working. System resumes automatically a few seconds after suspend

System properly suspends when clicked on Suspend but Wakes up automatically after a few seconds even without pressing any key or power button. sudo pm-suspend also not working anymore. sudo ...
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0answers
22 views

Network Card Refused to change power state after resume from suspend in 14.04, worked fine in 12.04

The ethernet wouldn't work after resuming from suspend, this was not the case in 12.04 after upgrading to 14.04 it happens all the time. Looking at the dmesg output after coming out of suspense it ...
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0answers
20 views

I want to charge an iPod while in Suspend

Sony Vaio VGN-FW250j Intel Core 2 Duo P8400 dual boot Win 7 / Ubuntu 15.04 I am able to suspend and hibernate this laptop in both OSes. Ubuntu will not allow me to use the USB ports to charge my ...
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0answers
14 views

Suspending when CPU idle

I am using 14.04 (Trusty). I have Power -> Suspend when inactive for 2 hours. This works fine if I am logged in and then walk away. But if I am not logged in, it never suspends. Moreover, I understand ...
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2answers
63 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 ...
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0answers
20 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, ...
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0answers
25 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
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1answer
27 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
27 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
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1answer
44 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 ...
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0answers
14 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 ...
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0answers
44 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 ...
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0answers
34 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 ...
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0answers
25 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
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1answer
39 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 ...
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0answers
28 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 ...
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0answers
31 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
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1answer
13 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
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0answers
15 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 ...
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0answers
18 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
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1answer
33 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
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0answers
12 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
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0answers
28 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
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1answer
24 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
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0answers
63 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
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1answer
18 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
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1answer
90 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 ...
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0answers
14 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
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0answers
24 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
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1answer
47 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
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0answers
18 views

pm-suspend doing nothing? [closed]

I have kodibuntu 14.04 and pm-utils not pm-suspend nor pm-hibernate causes any action. I see nothing relevant in dmesg or /var/log/ as far as I can see. echo "mem" > /sys/power/state or echo "disk" ...
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0answers
54 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 ...
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0answers
42 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
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0answers
47 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
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1answer
28 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
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1answer
103 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
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0answers
44 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
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0answers
60 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
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1answer
148 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
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0answers
49 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
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0answers
24 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
33 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
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1answer
26 views

APM best settings

I mean this one: What's the best setting for this? Best for performance. Thanks!
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0answers
31 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 ...