Questions related to power management, particularly power saving measures.

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Possibility to Limit Processor Utilization by %?

This question refers to the feature in Windows Power Settings that has 2 options: Minimum processor utilization: 0% Maximum processor utilization: 100% Since the default Power Options in Ubuntu ...
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15 views

Sleep buton no longer works on U12.04

I had and still have setting to show pop-up window when sleep button on my keyboard is pressed: gsettings get org.gnome.settings-daemon.plugins.power button-suspend = 'interactive' gsettings get ...
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75 views

Nothing happens when I close the lid or press power button

I just installed on Ubuntu 14.04.3 on my laptop (Lenovo Thinkpad X230). Everything works fine except: closing the lid pressing power button while the computer is on does nothing, even though I ...
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93 views

How to disable EEE in TG3 Driver (disable energy efficiency ethernet)?

I can easily set the eee to off (0) by using ethtools, but it doesn't stay disabled after a reboot - how do I make it permanent? Do I have to rebuild the driver with the EEE flag?
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38 views

My ubuntu not powering off version 14.04 hp laptop

I am having hp laptop. i installed Ubuntu 14.04. The problem is it is not shutting down. i need to press power button to shut down. i tried almost all steps like changing /etc/default/grub, installing ...
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75 views

Laptop will not hibernate when battery is critical

My laptop does not hibernate when the battery is critical. I tried the suggestions in several posts with related or similar titles. These included ensuring that pm-hibernate works modifying the ...
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1answer
149 views

Can't disable power management in Kubuntu 15.04 Desktop

I'm having trouble with my Kubuntu 15.04 (Plasma 5) installation. I'm running it on my desktop, so I don't have a battery, only AC. The problem is, that Kubuntu locks the screen after about 15 ...
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1answer
241 views

Nothing happens when I close my laptop lid or press the power button (Kubuntu 14.04.3, Thinkpad X250)

I'm on Kubuntu 14.04.3 on a ThinkPad X250. I tried to configure what happens when I close my laptop lid or when I press my power button in the "Configure Energy Saving" dialog in the "System ...
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43 views

Disconnect a laptop charger in software?

Short of the question: Are there any particular mechanisms to temporarily switch the charger input on a laptop on or off in software? In particular I am looking at a Dell Inspiron E1505 in my case. ...
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55 views

How to enable password request after hibernate | Ubuntu 14.04

1: I do not see the hibernate option in my power menu, I do see hibernate in my login screen power options but not when I log in (NB: pm-hibernate works flawlessly). I have edited ...
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92 views

How to restart Ubuntu box (14/15) on power loss, after after soft shutdown via 'apcupsd'?

Hello Ubuntu community - I've searched the forums, and scoured the internet, without resolution to this issue. I'm running Ubuntu 15.10 (formerly 14) on an Intel NUC (5i), connected to a Back-UPS ...
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25 views

sleep when power off, wake when power on

I have an old laptop and I want to use it as local server Battery is working, and I wonder if it possible to put laptop computer to sleep when power is off and wake it back in when power is on ? ...
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28 views

Dual display. Software dimming

I got a difficult question. I have a dual display setup. I sometimes watch a movie from the left screen and always have to reach for the power button to shutdown the right display during the movie. Is ...
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50 views

MAAS ubuntu 14.04 on Cisco UCSM power problems

I'm trying to install maas on UCS cisco but when i set "power type on UCS Manager Cisco" and than press on commission node the log show me this message: Failed to power on node — Node could not be ...
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2answers
224 views

Kernel panic 1/10 times after resume from suspend

I have a HP Notebook 15 running Lubuntu 15.04. On occasion after closing the lid and having my laptop suspend, I get kernel panic when I resume. Caps lock is blinking, and the screen locks - I have ...
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2answers
234 views

Xubuntu 14.04 fails to resume from hibernation

Not a crucial issue, it's just annoying when it happens. My computer has a great chance to fail in resuming from hibernation. When it happens, the console prints the following info and then hangs: ...
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504 views

JBL Charge 2 troubleshooting

Alright so I have a JBL Charge 2 and I had it charging for a day or two when I noticed it was blinking, so I unplugged it. I turned it on and it was fine and then I might have hit the phone icon ...
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1answer
51 views

Hibernate when lid is closed laptop 14.04

I need to hibernate the laptop when the lid is closed. Currently there is only suspend option is available.
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212 views

pm-suspend won't work

When execute pm-suspend, I got I/O error. And after checking other similar posts, didn't found a solution that fix the issue. The OS on pc: The pc has dual operating system: win8.1 mint mate 17.2 ...
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0answers
31 views

How to set power_profile at boot in 15.04?

I'm using 15.04 and trying to set the power_profile in /sys/class/drm/card0/device/power_profile to low at boot time, but whatever I try it's always high after a reboot. I'm using the following ...
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1answer
77 views

Auto-off screen only on battery power

This has been asked many times, but never answered. 14.04 Currently there is a function to automatically switch off the screen after the computer has been idle for x minutes. This setting will ...
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0answers
133 views

How can I reset usb port after over current draw?

I am powering my Raspbery pi with my USB2 port on my ubuntu laptop. Periodically, the USB power goes into over current protection and shuts down the port. I can reboot, and the port gets re-enabled, ...
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35 views

How can I execute a script when my laptop failed to suspend

My laptop occasionally fails to suspend, resulting in it burning up it's battery (and sometimes getting roasty-toasty in my bag). In dmesg I usually see this entry: PM: Some devices failed to ...
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144 views

Prevent gnome power manager from showing keyboard battery

My gnome toolbar shows a battery indicator which is always wrong. I recently figured out why; as when clicked it shows both my internal battery status and my keyboard status as two separate items: ...
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0answers
91 views

Ubuntu 14.04 Battery Icon has fixed value after booting till the next reboot [UPDATED]

I have a dual-booted Ubuntu 14.04 LTS with Win8.1 on a Dell inspiron 14 series 5000 machine. It tire me with alot of bugs starting with wireless instability and showing new ones with each update I ...
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12 views

Laptop wake up from suspend when lid is closed [duplicate]

I have installed on my laptop Ubuntu 15.04. Today I have closed the lid, the laptop got into suspend mode and I put my laptop in my bag. After 3 hours I got him out and it was hot as hell! The laptop ...
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95 views

Laptop battery draining too fast. No overheating

I'm using a Dell Inspiron 5520 laptop with a 3 month old battery. I've installed Ubuntu 14.04 LTS version recently and I'm completely new to the Linux world. I've noticed that the battery is draining ...
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0answers
77 views

Kubuntu 15.04 freezez on wakeup

I have Lenovo Ideapad Flex 10 laptop with Kubuntu 15.04 on board. When I close the laptop's lid, OS normally suspends, but when I open the lid, the system shows black screen with the mouse cursor on ...
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1answer
199 views

Battery Not charging fully on Sony Vaio

I recently purchased a new battery for my Sony Vaio VPCEH25EN running Ubuntu 15.04, and I noticed that it only charges to 40%. When I checked the power statistics I noticed the following - Percentage ...
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1answer
168 views

Ubuntu 14.04 - Suspend only locks screen

I am sorry if this question may have been asked and answered before, I completely understand that. But as of right now I cannot find a solution, so I am asking myself. So first off, I am completely ...
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1answer
32 views

Different behaviours when suspending

I always suspend my laptop in two different ways: Clicking "suspend" on the right top corner. Using the command line sudo pm-suspend. Depending on how I do it, the bahaviour is different. The ...
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1answer
152 views

Ubuntu 15.04 on laptop - “When plugged in” setting not enforced after battery is charged to 100%

I got Ubuntu 15.04 running on a Dell 3147. Under Power settings, I have When plugged in set to Don't suspend. It seems that after the battery has reached 100% it no longer honors this setting, instead ...
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1answer
534 views

How to turn off hard drive in Ubuntu?

I am running Kubuntu from External Hard Drive. My Internal Hard Drive has Windows on it. I don't want to use it while on Ubuntu and want to turn it off to produce less heat as well consume lower ...
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50 views

After suspend and restart computer constantly power cycles

So this likely could just be hardware issue, but let me explain what happened first. So I have a pre-built desktop that I've been running Ubuntu/Windows for about 3-4 years now. It typically runs ...
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0answers
63 views

Heating laptop and Low Battery (Probook 440 G1)

Currently I'm running Ubuntu 15.4 (x86_64) on my Probook (i7 4702 MQ, 8GB RAM, ATI 8750M).I previously had Windows 8 on this machine, which gave me a battery life of around 5-6 hours ...
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0answers
50 views

Ubuntu Gnome 15.04 when booting will shutdown and then power up by itself

I just installed Ubuntu Gnome 15.04 and when I want to power up the computer it will show the motherboard logo (ASUS), then it will show a silver/grey screen of the Ubuntu Gnome 15.04 without anything ...
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0answers
29 views

Strange battery behavior after updating from 14.04 to 15.04

I'm using HP machine with Intel Pentium N3520 and 4GB RAM. I recently updated to Ubuntu 15.04 and facing issues with battery, which is behaving like anything. It does not charges when operating system ...
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2answers
307 views

Does disabling touchscreen have any impact on battery life?

I hesitate about keeping my touchscreen disabled on my Ubuntu installation. I disabled it by adding Option "Ignore" "on" to the /usr/share/X11/xorg.conf.d/10-evdev.conf file : Section "InputClass" ...
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0answers
129 views

How to disable automatic shut-down on low power (Ubuntu 15.04)?

So apparently there's a nasty bug on my laptop (an Acer Aspire 3810T) that makes Ubuntu freak out when plugging/unplugging power. Frequently, it claims the battery is at 0% when switching power ...
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1answer
332 views

Powertop systemd service failed to load

After my installing of powertop and calibrating it, I create systemd service with following text: [Unit] Description=Powertop tunings [Service] Type=oneshot ExecStart=/usr/bin/powertop --auto-tune ...
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0answers
176 views

intel pstate, turbo always on cpu temp is 60 and without only ~43

I have a problem with pState on my Thinkpad L450 with Intel 5200U (broadwell) + SSD. When I use pstate, the turbo mode is nearly always turned ON and my CPU fan is also always ON because cpu temp is ...
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1answer
240 views

Suspend/Hibernate/restore and Reboot problems 15.04 Dell Inspiron 3451

There are many posts and questions about problems with lid closing leading to operating system states which require hard reboots; these reports come from across multiple kernels and releases of ...
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0answers
22 views

Computer won't restore from monitor power saving

When monitor power saving mode is on and the monitor falls asleep, I can't wake it up and have to do a hard shutdown. I've tried pressing keys, moving and clicking the mouse, unplugging and replugging ...
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1answer
468 views

How to scale intel_pstate driver on Ubuntu 15.04?

I nearly tried all the solution to scale the cpu frequency but no success. I have Intel Core i5-3210m 2.5Ghz-3.1Ghz. I want to permanently set it to 1.6Ghz with no turbo boost to improve battery ...
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1answer
61 views

Heating, projecting and lid closing problems in Ubuntu Gnome 15.04

Ever since I upgraded from Ubuntu 14.04 to 15.04 in April this year, I have been beset by productivity-reducing problems. I had started off unable to get the login screen on booting which got resolved ...
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0answers
38 views

PC is shutting down although the battery is charged 50% of above

I'm using Ubuntu 14.04 the problem is when I am using pc with plug in for charging or without charging from starting time it working normally.But when I plug out the pc from charger when the pc is ...
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0answers
70 views

Why does my computer try to shut down when I plug in headphones?

Using Ubuntu 14.04LTS. Noticed that when I plug in headphones, a menu appears asking if I want to "lock, suspend, restart, or shut down." Is this normal? How do I fix this if it isn't normal?
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85 views

Ubuntu 14.04 can't fully charge battery with windows 8.1 dual boot

I have a Toshiba Satellite E45t-A4100 dual boot windows 8.1 with ubuntu 14.04. There was no problem with installation. Normally the battery will charge to 70%. Sometimes it will charge to roughly 80% ...
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79 views

Lenovo B50 power management

Lenovo B50 power management is not working with Ubuntu 14 and 15 versions when shutted down the laptop is still running while only the screen is switched off, same when restarting Regards John
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122 views

14.04.3 wakes up as soon as putting to sleep

I have Ubuntu 14.04.3 32 bit OS. I set my comp to sleep after 5 minutes of idleness. It was running OK until today. I should say that handling of power management is not reliable in Ubuntu. My system ...