Questions related to power management, particularly power saving measures.

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Power brightness issues

I recently switched to Xubuntu from windows. GOOD RIDDANCE! Anyway I cannot adjust my screen brightness and it is really dim. My computer is a Samsung NP470R5E. I am running Xubuntu 14.04. Any advice?
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1answer
141 views

Disable sleep on laptop lid close in tty1

I'm using Ubuntu Desktop 15.10 on a laptop and it runs an Apache server with SSH as well. When using a GUI, I have the power options set to not sleep at all even when the laptop lid is closed, but ...
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0answers
44 views

Ubuntu 15.10 on laptop only wakes up by opening the lid

I have a HP Spectre XT with a defective display (which I disconnected) and use an external display, keyboard and mouse. The laptop so just functions as a desktop. I use the power button on the ...
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3answers
76 views

Energy management Ubuntu

I don't have a problem with ubuntu, everything is working fine, but I'm wondering if it can be more power-efficient. For now I have installed tlp, powertop, and cpu-frequency-scaling-indicator. When ...
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1answer
148 views

Automatically reduce brightness on battery in Ubuntu 15.10?

How can I automatically reduce brightness when I unplug the AC in Ubuntu 15.10? I tried modifying dconf-editor settings as suggested here, http://askubuntu.com/a/312619/511925, but there are no ...
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0answers
29 views

xfce power manager makes wrong notifications

xfce Power Manager shows random notifications about my laptop running out of battery, but I am plugged in. Then it pops a notification saying I am plugged in, then another saying it is discharging, ...
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0answers
43 views

Battery status seems to be stuck

I have a Dell Inspiron 3000 series with Ubuntu 15.10. I noticed a few hours ago that the battery status remained unchanged (at 45%) and it said 1:40 hours left for full charge. I tried removing and ...
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0answers
92 views

Ubuntu 14.04 wakes up immediately after suspend or shut down after network card firmware update

I know there are many topics regarding the problem of ubuntu waking up immediately after suspend/hibbernate/shut down. Unfortunately I have not found anything that helped my case. First of all my ...
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1answer
43 views

Whats happened to the battery? Help understanding the BAT0 report

my laptop's battery seems dead(the laptop only runs with the AC plugged in), but the BAT0 report says the following: ▶—— NOTEBOOK BATTERY (BAT0) ——◀ Complete Report: Name ...
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0answers
23 views

Trusty 14.04.4 Laptop powers off unexpectedly

Recently upgraded the HWE to the Wily stack (Kernel 4.2) on my Thinkpad T410. Now, even when on AC, the laptop powers down for no reason. Originally I thought it was due to inactivity and suspected ...
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0answers
24 views

Battery Indicator come and go

I've searched Ask Ubuntu and the web but couldn't find a similiar issue, so: After reinstalling Ubuntu 15.10 on my notebook (Toshiba Satellite U940-120), the battery indicator shows up after start ...
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0answers
53 views

Battery indicator shows opposite state: charging when discharging and vice versa [15.10]

So, pretty weird bug. As the title says, when my battery is charging, it says the power is draining (the symbol changes and it tells me how long is left until I'm dead), and when the power is not ...
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1answer
78 views

Menu for hibernate does not work, pm-hibernate does

After upgrade to 15.10 I have been unable to activate hibernation from the start/stop menu. Doing so the following error appear in dmesg: PM: Swap header not found! I have checked again that my: /...
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0answers
46 views

15.10 Hibernate not powering PC off

Ubuntu 15.10 with 4.4 kernel on Dell XPS 15 9530 (new one). System do not powering itself off after hibernation. Executing pm-hibernate does almost all except notebook will stay under power. The ...
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0answers
37 views

UPS integration with Ubuntu 14

I'm interesting the opportunity UPS integration with Ubuntu 14. UPS Mustek PowerMust 800 USB connected to the desktop computer. NUT server is configured (blazer_usb driver). Both work correctly KNUT ...
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1answer
105 views

15.10 - Suspend job starts by itself - docked laptop - closed lid - ext. display

I have just installed and set up my HP Elitebook 8440p with Ubuntu Gnome 15.10 64bit and Gnome 3.18 During the installation, everything went nice, while the laptop was docked and the lid was closed. I ...
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0answers
49 views

Ubuntu 14.04 'Suspend' won't work - Samsung ATIV Book 9 Plus

so I'm really new to Ubuntu 14.04 (installed it last night--Windows 10 November build was not compatible with my model). Currently I have my boot partitioned, and everything has been working smoothly ...
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1answer
50 views

How I can modify the “hibernate” option in the power menu

I can hibernate correctly my laptop, by the command sudo pm-hibernate. Even the resume works well! But if I try to hibernate by the power menu (Unity on Ubuntu 14.04 with hibernate option enabled), ...
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1answer
83 views

Keep Screen On When Watching Online Videos

I really like Ubuntu 14.04 so far. But when I watch a video on-line, I need to move my mouse every few minutes to avoid screen going black - highly annoying and doesn't make much sense when nearly ...
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1answer
54 views

Lenova Thinkpad power button does nothing

I have installed Ubuntu on many computers, both desktop and laptop, and the power button opens the power menu asking what to do. However, I just got a Lenova Thinkpad T410i secondhand from a friend. ...
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2answers
105 views

Saving battery on laptop

I have searched google for an answer but I didn't find a good one. I just bought a laptop (MSI GE62 2QD) and installed ubuntu. My problem is that the battery runs out very fast. Is there some way to ...
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0answers
27 views

How do I enable the sleep settings in xubuntu?

The slider is grayed out and it won't let me move it. I have a feeling if I run Power Manager as root I will be able to change it. I don't know how though. I personally have no problem working in ...
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0answers
46 views

Battery status switch between charging/charged constantly after upgrading to 15.10

I've upgraded from ubuntu 15.04 to 15.10 just some days ago. Now I see that the battery indicator always switches every second between the notebook's and the mouse's battery. The notebook's battery in ...
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0answers
46 views

Xubuntu - No video signal

I recently switched from Unity to Xfce on my HTPC with a clean install of Xubuntu. Now whenever I turn off my TV and let it sit for a while, when I turn the TV back on there is no video signal, even ...
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0answers
19 views

How to use IWCONFIG to set my wireless power management timeout/profile

Can I use iwconfig to set my wireless power management timeout? I don't know what can be done, but I read the man page on the command line and it has some configurations for power management. What I ...
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0answers
34 views

How to enable suspend using cron

I am using i3 as a windows manager, and battery low detection goes by the wayside... I sometimes find my PC drained and dead after leaving it to do some work. I found a couple of good battery low ...
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2answers
364 views

Ubuntu 14.04 unity shows wrong battery status

I am using ASUS laptop and the model is X555-50. I have ubuntu 14.04 installed with unity desktop. It used to show the correct battery status earlier. But suddenly it is not displaying the correct ...
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0answers
213 views

Turn off display while lid is closed but prevent sleep on ubuntu server

I am currently running ubuntu server 14.04.3 on a macbook. I have managed to close the lid while preventing the system from sleeping but it does not turn off the display however it does turn off after ...
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1answer
62 views

Turning the brightness completely down

I used to run the command xbacklight -set 0 to make my brightness effectively 0 i.e. it was almost impossible to see anything, which was really helpful for conserving my battery power. However having ...
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1answer
325 views

Laptop battery keeps discharging even after full charge (not switching to AC)

The laptop does not switch to AC mode after fully charging. I dualboot and this problem is nonexistent on Windows 10. But on Ubuntu 15.10 it just keeps discharging. Problem persists on Ubuntu 16.04 ...
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0answers
85 views

When lid is closed, no internent connection

new to linux and ubuntu so please show some understanding :) im using an external monitor with my laptop, and when i close the lid (already set up the power management so nothingks will happen when i ...
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0answers
23 views

Harddisk spinning when plugging/unplugging laptop

Im setting power management on my linux as I'm using laptop. I found on the internet that one good software is TLP, which helps power management. I have Acer Aspire V15 Nitro which have combination of ...
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0answers
148 views

Shut-down/Restart/Power-up “work” as Suspend on a Lenovo g50-70 running Ubuntu MATE 15.10

As the title suggests; when it comes to shut-down/restart both suspend the laptop unless I go with sudo -shutdown which works as expected. When powering-up, it goes through the GRUB (since I'm ...
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0answers
44 views

Screen locking and energy saving does not work when using ethernet connection

I have Kubuntu 15.10 installed on three computers, and on all three computers, I have "Screen Energy Saving" and automatic screen locking enabled in the system settings. On desktop 1, both screen ...
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3answers
218 views

i3 throttled at 500Mhz when battery under 30%

I have the following problem. As soon as the battery drops below 30%, the CPU is being throttled to 500Mhz. As soon as I plug in the power adapter, it goes back to normal. The laptop is a Lenovo U41-...
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0answers
91 views

Laptop battery started discharging rapidly in 15.10, even during suspend. Powertop points to wlan0

I don't know the exact timeline of this problem but my Dell L502X XPS 15 laptop is having battery problems . Symptoms Battery discharges very rapidly (like, in 1 hour) when in use (instead of 4 ...
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0answers
64 views

Ubuntu Server Power Management - Advanced Settings via Terminal

How to configure power settings for Ubuntu Server 14.04? Desktop is not installed. My server is plugged to a UPS (battery) and the battery is connected to the server as well to monitor how much power ...
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0answers
35 views

Headless wont boot without screen connected

For a couple of years I have been running a little PC as a headless server with 14.04. I recently upgraded the hardware, and used DD to copy the hard drive to the new drive and new mother board. ...
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0answers
27 views

Power Errors after commissioning in MAAS

We are having a problem with MAAS. We succeed in commissioning servers and MAAS is able to do it, but afterwards we are getting Power Errors. Our setup consists of two Dell Power Edge 1950 BIOS ...
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1answer
42 views

Laptop shuts-down when power ac is unplugged on Ubuntu 15.10

I've been searching the web for answers regarding this issue but most are outdated, and don't work for me, I tried to locate/apps/gnome-power-manager/general on dconf-editor but it seems that the ...
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0answers
64 views

LXDE battery monitor not warning when battery is low

I am running Lubuntu 15.10. In prior releases, I would receive a low battery warning, but now, though Battery Manager shows an accurate remaining battery indicator, I get no pop-up warning when the ...
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2answers
162 views

Where can I configure iwconfig wlan0 power on/off?

I've noticed that my wlan0 interface has power management on even when I am plugged in. I can turn it off with sudo iwconfig wlan0 power off, but it turns on again at reboot or when I unplug my laptop....
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1answer
45 views

solid state drive corrupts with sudden power loss

running xubuntu 14.04. I have a kingsoft ssd installed. When there is an unexpected power loss the drive gets corrupted causing me to have to re install. I read that unplugging the drive (of course) ...
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2answers
91 views

Computer shuts down after some hours of sleeping while unplugged

When I put my computer to sleep, close its lid, and unplug the power from the wall, then it will shut down automatically after about 2 hours. It is not like the battery is dying, because when this ...
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2answers
151 views

Battery capacity dropped from 97% to 30%. Is it ubuntu's problem?

I have MSI laptop (CX61 2QC). I have purchased it recently (about 1 month ago). I have made a installed ubuntu installed in it. Yesterday when I was using it the battery capacity was showing 97 %. ...
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0answers
113 views

15.10 on Asus Zenbook: Hanging at shutdown with power plugged in

I have an ASUS Zenbook UX305 and I've installed Ubuntu 15.10 on it. Everything works fine, except that when I have the power cable plugged in and do a shutdown I think it must hang just as it's about ...
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1answer
36 views

Battery icon on top-right takes a long while to come after switching from Unity to GNOME Desktop

I've recently switched from unity to ubuntu-gnome-desktop on my inspiron laptop running 14.04 LTS. After I reconfigured gdm as primary display manager and logged into the new desktop, I faced two ...
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0answers
37 views

What Are Charge Profile and Charge Accuracy?

In Power Statistics Window, selecting Laptop Battery from left menu, then going statistics tab, we have "Charge Profile", "Charge Accuracy", "Discharge Profile", "Discharge Accuracy" graph types. ...
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1answer
92 views

Can I prevent a named application changing the CPU's frequency?

I have an Intel server. The CPUs are power managed between 800MHz and 3GHz, using the p_state driver. Obviously it's drawing less power and making less noise when it's down at 800Mhz. Most of the ...
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0answers
15 views

Ubuntu HWE upgrade trashes battery life

I've been using 14.04 for a few months on my Lenovo W541 (coming from 12.04) and battery life has been good - about 8 hours. I implemented the usual power saving tips. However, immediately after ...