Questions related to power management, particularly power saving measures.

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147 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 ...
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0answers
97 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 ...
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1answer
200 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 ...
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1answer
399 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 ...
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1answer
130 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 ...
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0answers
169 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 ...
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1answer
63 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 ...
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172 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 ...
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1answer
74 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 ...
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0answers
66 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 ...
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0answers
64 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 ...
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3answers
709 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: ...
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3answers
562 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 ...
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0answers
466 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 ...
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0answers
85 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 ...
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1answer
112 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
111 views

GRUB boot options in Refind

I'm trying to lower the power consumption on my Macbook Air with the steps at https://help.ubuntu.com/community/MacBookAir6-2/Trusty#Finetuning_Powersave_functions but I can't seem to get tlp stat to ...
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0answers
179 views

Battery not working/charging but detected [closed]

i have a thinkpad t 410 and ubuntu 14.04 LTS installed. everything worked fine for a long time, but since a week or so my battery is not working properly any more (orange battery light flashing) it ...
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1answer
389 views

Ubuntu 14.04 EliteBook 8460p constant fan, hot, short battery

Finally took the plunge from Ubuntu in VM to wiping Windows and installing Ubuntu 14.04. I'm liking it so far although I've noticed the laptop gets hot very quickly, the fan is constantly on, and the ...
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0answers
89 views

Ubuntu (14.04) freezes on laptop when disconnected from power

I have Ubuntu 14.04.1 installed along windows 7 (dual boot). My laptop is a HP Compaq 6710b which has an Intel CPU and an Intel graphics card. When I boot my laptop on the power adapter, no problems ...
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0answers
28 views

Power management policy for all users

I have a machine with one administrator user and one standard user. Is it possible for the admin to set a power management policy (suspend after 30 minutes of inactivity, for example) that the ...
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0answers
100 views

Ubuntu (14.04) freezes on laptop when power not inserted

I use Linux Mint 17 Qiana (on Ubuntu 14.04.1). My laptop is a Dell Inspiron M5110 which has an AMD CPU and an AMD graphics card. When I boot my laptop on battery, no problems occur. When I boot my ...
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1answer
398 views

How to repair powerstate (intel_pstate) on Intel Haswell chips?

I recently installed tlp on my Lenovo U430p laptop. After I runned it I noticed significant drop in my laptop's on bettery time. Now my laptop lasts on battery for 2 hours less than before. After ...
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1answer
428 views

Turn power OFF of USB Ports - Ubuntu 10.04 machine

I have Ubuntu 10.04 based portable touchscreen computers at workplace and sometimes people would use USB data cable to charge their phones from the USB port. Now I have usb storage access disabled ...
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1answer
176 views

Controlling Fans on an HP Probook 4525s

I would like to simply set my fan to run at 100% speed all the time. Is there any way to do this without fancontrol? Is there a way to physically make the fan run at all times (external power?) or ...
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0answers
94 views

TLP + PHC seem not to work after resume from suspend

I installed TLP 0.6. I also have kernel 3.14.2 with the PHC module for Ubuntu 14.04 (which is what I use). It seems to work when I reboot. The temperature is low. But after I resume from suspend the ...
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0answers
71 views

Lenovo Yoga 2 Pro and Ubuntu 14.04: Power display not updating

The percentage and remaining battery time display on the top right do not update on my Yoga 2 Pro that is running Ubuntu 14.04. However, if I click on the battery and Power Statistics program starts, ...
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2answers
120 views

Cannot Keep Ubuntu Server running on a laptop despite workarounds

I have Ubuntu 14.04.01 server. I edited /etc/systemd/logind.confand changed a line to HandleLidSwitch=ignore Then I saved the file and executed sudo restart systemd-logind. I even rebooted the ...
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0answers
327 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 ...
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0answers
33 views

Which part of the kernel powers on/off USB ports? How - the internals?

Please refer to this post: Power on/off USB ports . It is one thing to blindly replicate the codes in a terminal and get the desired results. I wish to know which part of the kernel does this work, ...
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0answers
111 views

Just installed Ubuntu 14.04 Battery no longer charging past 70%

thanks for the help. I just installed Ubuntu, and it was working fine yesterday. I just fixed my internet connection speed, but now my battery is stuck at 70% charged. It has a symbol that says its ...
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0answers
187 views

Battery issues - suddenly critical level [Ubuntu 14.04]

Since a week I'm experiencing sudden drops in battery level: it will be around 50-60% and suddenly drop to less than 10% and I get the message the battery level is critically low. Sometimes it doesn't ...
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0answers
66 views

Power Statistics in Ununtu 14.04 shows me battery percentage = 0%. How to fix it?

in the past days I killed my netbook while booting, then I found that I can't turn it on unless it's connected to AC power. Power statistics tells me the battery is charging, the time to full is 0, ...
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1answer
199 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 ...
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2answers
195 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. ...
0
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1answer
136 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 ...
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0answers
446 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 ...
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0answers
156 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 ...
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1answer
88 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. ...
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0answers
29 views

How not to spindown HDD on suspend? [duplicate]

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
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1answer
100 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 ...
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2answers
115 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 ...
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0answers
101 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 ...
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0answers
23 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 ...
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4answers
3k 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 ...
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0answers
56 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 ...
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1answer
31 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, ...
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0answers
98 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?
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1answer
275 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 ...
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0answers
25 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