Questions related to power management, particularly power saving measures.

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9
votes
8answers
28k views

How to stop screen going black after 10 min

My OS is Lubuntu 13.04. After 10 mins of inactivity the screen goes black. What I did to stop it without effect: uninstalled xscreensaver completely in power setting I set to never blank the screen ...
0
votes
0answers
13 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
votes
1answer
16 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 ...
5
votes
5answers
19k 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 ...
43
votes
5answers
116k 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 ...
3
votes
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 ...
0
votes
0answers
22 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
votes
1answer
38 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 ...
0
votes
1answer
13 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
votes
0answers
7 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
vote
0answers
20 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
votes
1answer
29 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
votes
0answers
13 views

pm-suspend doing nothing?

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" ...
1
vote
3answers
109 views

Why is my system not waking up from suspend?

I freshly installed Ubuntu 15.04 sharing a preexisting home partition (Mint 17.1). However, in neither Mint or Ubuntu the computer is waking up from suspend mode. The status LED keeps blinking and the ...
1
vote
3answers
352 views

Black screen on laptop lid open after update to 15.04

I suspend my laptop by closing the lid, but when I open it my screen stays black, when I should be prompted to enter my xscreensaver password. The screen is "on" because I can switch TTY using ...
1
vote
0answers
32 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 ...
2
votes
2answers
2k 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
votes
0answers
16 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 ...
1
vote
0answers
25 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
vote
1answer
32 views

HP Envy Touch Smart 15 heat on bottom screen

I recently installed ubuntu 14.04 LTS, on my HP Envy Touch Smart 15 laptop. When running more than 30 minutes the bottom part of the screen (on the HP logo) getting unusual heat. It also can be feel ...
0
votes
1answer
27 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
votes
1answer
38 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
vote
0answers
27 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 ...
3
votes
1answer
3k views

xset: unable to open display

for the longest time after about 5 minutes my screen would blank out. Now the screen will go blank after 5 minutes but then 2 seconds after that it will light up white and keep the laptop ...
4
votes
0answers
890 views

How to count battery cycles?

Like most users that have searched know, Manufacturers ACPI implementation is a mess and for most of our laptops, battery info is unavailable or wrong (on a dell inspiron 15z, the rate is divided by ...
0
votes
0answers
28 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
votes
0answers
53 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
votes
1answer
66 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
votes
0answers
13 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
22 views

APM best settings

I mean this one: What's the best setting for this? Best for performance. Thanks!
1
vote
1answer
23 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 ...
5
votes
2answers
655 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 ...
127
votes
21answers
118k views

Tips to extend battery life for laptops and notebooks

This question is present as a matter of historical interest. While you are encouraged to help maintain its answers, please understand that "big list" questions are not generally allowed on Ask ...
13
votes
1answer
573 views

How to leave a usb port powered during shutdown for charging mobile?

My Sony VAIO Laptop has a feature which will allow me to keep one USB port powered even when my laptop is shut down. It is given in the manual here. It can be switched on or off from the Vaio software ...
1
vote
0answers
16 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 ...
0
votes
0answers
20 views

Nothing happens when i press the power button

When i press the power button on my desktop it used to suspend but now it seems that nothing happens. Would the fix be under sudo gedit /etc/acpi/events/powerbtn? Thanks.
0
votes
2answers
60 views

How to disable Intel Display Power Saving Technology in Ubuntu 14.04

I am using Dell Inspiron 15 (3542, early 2014). There's an annoying feature which adjusts the LCD brightness according to what's displayed on the screen. When I was using Windows 8, I disabled it ...
2
votes
1answer
281 views

How to uninstall laptop-mode-tools installed from an .tar.gz archive?

Hey all I downloaded this file (http://packages.ubuntu.com/lucid/laptop-mode-tools) but can't seem to be able to uninstall it. I tried looking online as well as the README file but there is only ...
56
votes
8answers
80k views

How do I modify the options for the power button?

When I press the power button a dialog opens, but I want to shutdown the system without receiving "Do you really really want to shutdown?". How can I choose a direct shutdown action on a pressed power ...
2
votes
1answer
57 views

Cannot detect power supply plug/unplug on Ubuntu 14.04.2

After plug/unplug power supply nothing happened, means battery icon does not have any reflect or when unplug power supply use battery until become completely empty without hibernate or even shut down. ...
4
votes
1answer
379 views

Prevent machine from sleeping when SSH connections are on

I am trying to save power by switching desktops to suspend mode when they are inactive. But many desktops are also accessed via SSH by their owners. There is a wakeonlan solution deployed to enable ...
1
vote
3answers
4k views

How to improve battery life on a HP Pavilion dv6?

I've installed Ubuntu 12.10 a few days ago and I have only been able to get up to one hour of battery life. When running Windows 7 I get up to 3-4 hours. My screen is ultra bright, even though the ...
1
vote
1answer
40 views

Ubuntu 15.04 - after hard power boot, it never comes back or it boots but then it does not behave correctly

I have a kiosk running with Ubuntu 15.04 64-bit, which is connected to a 47" screen, on boot it starts Google Chrome. Now the Ubuntu 15.04 needs to be powered off (6PM) and powered on (8AM). When ...
0
votes
2answers
314 views

Wireless power management turns back on in 15.04

I have turned off power management for my wireless. I did that in /etc/pm/power.d/wireless. When I try to connect to a network, the power management turns back on. So the connection fails. I try: ...
1
vote
2answers
121 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 ...
1
vote
1answer
69 views

ubuntu 14.10 issue with suspend

I have a Acer Aspire E5-571G-52FL and when try to suspend (when lid is closed for example) it not wake up after that. Only black screen and nothing. Could you please help? Thanks! 3.16.0-33-generic ...
1
vote
1answer
3k views

How to get xfce4-power-manager to work in Lubuntu 14.04?

I've had nothing but issues with it. On install, everything went fine, but I couldn't modify the lid action, and the suspending was very buggy - sometimes it worked, sometimes not. Then I found out ...
0
votes
0answers
17 views

What is wrong with the power management of my Aspire One 756

My Acer Aspire One 756 (AO756-2894) doesn't want to charge the battery. The battery might be dead. However plugged in and without the battery it seems to remember the state of charge of the battery ...
0
votes
1answer
121 views

How to save battery life in Dell Vostro 3446 (Ubuntu 15.04)

I have both Windows 7 and Ubuntu 15.04 on my Vostro 3446. I noticed that when I'm on Windows 7 I get easily 4-5 hours of battery life but when I'm on Ubuntu, it barely lasts 1.5-2 hours. I cam across ...
1
vote
0answers
30 views

MAAS Power-on problem IDRAC IPMI 2.0

I'm currently having a problem in getting MaaS (v1.7) to properly provision a Dell PowerEdge R630 server. The MaaS vm itself is able to detect the server automatically, and once the dell server boots ...