Questions related to power management, particularly power saving measures.

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0answers
8 views

What are the devices listed in gnome shell's power managemnet settings

What are the devices listed here? k520 and M310... what are these and why is one at 55%?
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0answers
8 views

Command to sleep (put into low power state) and scheduled task to wake back up [duplicate]

I can use sudo pm-hibernate to put my laptop into a low power state, but I have to press the power button to turn it back on. Is there a way I can put it into a low power state that can then be turned ...
2
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3answers
2k views

battery discharges in a strange way on Lenovo Ideapad Z500

I've a Lenovo ideapad Z500 laptop with Windows only energy management software (my battery stop charging at 60% for long lasting life). Setting the threshold from Windows, it remains also with Ubuntu ...
0
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1answer
50 views

Screen dim while brightness set to max on Xubuntu 14.04 everytime display turns off

I used to have an issue where every time my laptop would return from suspend, the screen was fully dim (as if brightness was at a minimum) even though the brightness setting was set to maximum - so I ...
0
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2answers
1k views

Docky is closing when I plug/unplug the AC cable

Every time I plug/unplug the power cable docky is closing. This thing is happening since I have updated to 14.04, also, my battery life seems to be shorter. I am using a toshiba satellite c55-A-1PX.
0
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0answers
66 views

Power Management

I'm running Ubuntu on an Acer Aspire V Nitro - VN7-571G laptop. The battery should last for 8.5 hours with Windows 8.1, but with Ubunt the battery drains in about 3 hours. Acer has no drivers for ...
0
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0answers
19 views

USB external HDD spins down, but just from command line. I must be missing something

I have two different external USB 3.0 hard drives connected to my Ubuntu computer and none of them auto spin down after 10 mins. Funny thing, if I run a Windows 8.1 virtual machine and attach the ...
0
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0answers
29 views

Is there any way to make the system not to suspend while a download in progress?

Is there any way to set the system not to suspend while a download in progress but only turn screen off?
1
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1answer
23 views

How to temporarily disable sleep and hibernate from the command line

It seems like there are many ways in which a Ubuntu's settings can be permanently manipulated to sleep when desired as long as predetermined conditions are met. However, these are more permanent ...
1
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1answer
36 views

SED (self encrpyting disk) is crashing on system resume

I have asked this question before (here and here ) My problem is that my Self Encrypted Disk (SED) have to NOT spin down even on suspend! I have tried this, but it did not work and the disk spin ...
0
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0answers
12 views

Openbox and xfce4-power-manager

I am using Ubuntu and openbox. When I start up, I see the normal login screen like when using unity and it connects to Wifi. I have selected openbox from the dropdown list and it remembers this ...
0
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1answer
15 views

How do I get my power indicator to reliably warn me before shutting off my laptop?

A while back I was having trouble because my power indicator for my laptop running Ubuntu never warned me when the power was about to go off. That was when using Ubuntu 14.04, and to be honest, I ...
1
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3answers
446 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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1answer
23 views

Found low power CPU looking for Asus MB [on hold]

For my home I'm looking to build low powered Ubuntu Desktop machine and I found this article for low power CPU ...
0
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0answers
92 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 ...
3
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1answer
294 views

Laptop battery always discharging

I have a fully up to date Ubuntu 14.04 on my Asus X550DP laptop. My problem is that the battery is always discharging. When I plug the AC adapter in, it charges battery up to around 96% and stops ...
0
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2answers
66 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. ...
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
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0answers
71 views

Wake on LAN cause computer wake up immediately after shutting down

I've installed Ubuntu on my Dell PC, and i want to use Wake on LAN. But here i encounter a weird problem. The computer will wake up immediately after shutting down. Here is what i've done: The ...
0
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0answers
44 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 ...
38
votes
4answers
103k views

Shutdown does not power off computer

I recently upgraded from Ubuntu 11.10 to 12.04. If it makes any difference, my system is a Dell Inspiron 1520. I encounter a problem whenever I shutdown or restart; it kills all running processes ...
0
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1answer
25 views

USB Power Saving Settings

I have a USB weather station. If the screensaver kicks on (blank screen and lock), data from the weather station stalls out. I can lock the screen manually and I have no issues at all with the ...
0
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1answer
81 views

How to set hibernate/shutdown timers? XFCE power manager not having an effect in Lubuntu

I like to fall asleep listening to internet radio or a streaming video. I would prefer to have my computer go into hibernate mode an hour after I've become inactive, not 15 minutes after. I would ...
2
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2answers
150 views

Laptop freezes whenever I unplug/plug in AC adapter

I have a Samsung Series 9 laptop, model NP900X4C. For a long time now this laptop has had issues with the battery and AC adapter, like this, which got fixed about six months ago: ...
8
votes
4answers
2k 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 ...
6
votes
3answers
11k 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 ...
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0answers
37 views

Battery efficiency issue in Ubuntu 14.04

I have an HP Probook 440 G2, with an intel core i5-4210U processor. I have dual boot windows 8.1 installation. I get approx 5+ hours of battery backup in Windows 8.1 and approx 2+ hours in Ubuntu. My ...
24
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5answers
48k views

How can I control HDD spin down time?

I have 2 HDDs in my PC. Ubuntu is turning off the secondary HDD very quickly after about 15 minutes, which is short for me. I need to control this time. How can I do it? I tried GNOME power ...
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0answers
403 views

DisplayPort does not work on 14.04

I have a new Dell 2713HM screen in my office and I could not make the Displayport output work. It just went into power saving mode. The same screen and cable works on my college's desktop and he uses ...
0
votes
1answer
52 views

how to disable charging in ubuntu when battery level is above 80 percent?

I tried various tutorials to stop charging laptop battery but it is not working on my Lenovo laptop. I tried following commands: sudo apt-get install tp-smapi-dkms sudo modprobe tp_smapi ...
0
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1answer
52 views

Charging only ever reaches 95%

I am using Ubuntu 14.10. And my computer is always attached to an AC power source thus it is always charging. But I have noticed that my battery says it is charged when I click on the battery icon in ...
0
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0answers
50 views

Confused about Light Locker/Power Manager settings in Xubuntu 14.04

In Xubuntu 14.04, Light Locker and Power Manager settings are different control panel views, however, there are screensaver settings inside Light Locker's one. Anyway, there's no screensaver options ...
1
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1answer
41 views

Energy Saving on Ubuntu PC's (not Laptops!) [duplicate]

Can I use software designed for power saving on laptops on Home PC. (not a laptop) Or maybe someone could suggest alternative tools designed for saving power on PC desktop? What are the other steps ...
1
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2answers
478 views

Alarm clock from suspended mode

I want my laptop to wake up from suspended mode in the morning and alarm me to wake up using my mp3 file. How do I do it? I tried apmsleep, but it doesn't work cause my PC doesnt have "suspend to ...
1
vote
3answers
103 views

How to shut down Lubuntu immediately with the power button instead of a logout method dialog prompt

I would like the computer to shut down directly after I press the power button. At the moment, Lubuntu opens a shutdown method dialog box when I press the shutdown button. I suspect I can simply ...
2
votes
1answer
499 views

Laptop power saving or management in Ubuntu 14.04

Is there any sort of installation that can be added to provide power options for when I am running on battery? I wouldn't want to always be on power savings, so I would hope I could switch between Eco ...
0
votes
0answers
30 views

Laptop Brightness not remembered on Power Plugged in

On Ubuntu 14.10 Utopic, using a Samsung Notebook laptop, I can change the brightness correctly and it is remembered upon wake from sleep. However my problem is that when my laptop is on battery and I ...
0
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0answers
29 views

How to dump selected iwconfig outputs to text files? (to analyse Tx-power, bit rate, link quality, etc. for EMF reduction)

BACKGROUND I've read about Electromagnetic Field (EMF) pollution and I want to protect myself. I have a not bad solution for my smartphone, now decided to tackle WiFi. It appears that power of the ...
-1
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0answers
15 views

Problem with pm-suspend and mSata

I noticed a strange thing when i put my computer in pm-suspend mode my hard disk (mSata crucial m550) continue to be a litlle hot ... It seem to be power up ... I think it isn't normal But i ...
1
vote
3answers
642 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
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0answers
21 views

Macbook 9,1 Ubuntu 14.04 keyboard issues on resume

I have read many similar post and tried nearly all post to no avail. Screen and keyboard illuminates; but no keys actually work. (I tried the F6 trick too) Trackpad does allow me to move the ...
4
votes
4answers
14k views

How to make my screen brightness not change when I plug my laptop in

I do not want my laptop to change brightness when my laptop power is plugged in or unplugged. I set my brightness based on how bright my surroundings are. If I am in a dark room, I set my brightness ...
0
votes
0answers
86 views

How to disable automatic brightness adjustment in Ubuntu 14.04?

I am running Ubuntu 14.04 LTS on a Dell 3542 laptop. My problem is that screen brightness changes depending on content. I think this is called automatic (or dynamic) brightness adjustment, as I stated ...
52
votes
15answers
49k views

How to prevent my screen from either dimming or the screen-lock starting when watching YouTube?

My screen brightness used to dim after a few seconds to preserve battery. This is default in Ubuntu 12.04. However when watching video it should not dim. This works correctly when I watch videos ...
0
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0answers
49 views

Laptop hangs instead of suspends when closing lid

I have a HP Pavilion DV6 laptop with Ubuntu 14.04 LTS dual boot with Windows 8. Not every time but occasionally if I close the laptop lid it does not suspend as it should, but hangs with the power ...
8
votes
3answers
2k views

How can I enable automatic resume on lid open?

My problem is the opposite of what is described in How to prevent resume from sleep/suspend on lid open?. If I close my laptop's lid, it automatically suspends, but when I open it up again, nothing ...
1
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1answer
54 views

Laptop lid power options

How do I configure my laptop to perform in the following manner in Ubuntu 14.04.1 Server? Current State When the laptop is powered on and the lid is closed: External screen loses signal Laptop enters ...
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0answers
63 views

Get program to catch signal after wake from suspend?

I'm running a program (specifically oscam) that interfaces with a serial reader on a USB port. However, the tty device file that the USB device gets assigned to differs and, in particular, changes ...
8
votes
2answers
2k 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
120 views

WOL doesn't wake PC (keyboard does). How to fix?

I manage to get my PC to hibernate through pm-hibernate --quirk-s3-bios. Suspend strangely enough doesn't work (PC reboots immediately to a new state and Ubuntu starts a disk check, but that's only as ...