Questions related to power management, particularly power saving measures.

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1answer
6 views

Ubuntu locks laptop at 3% battery

Alright, So I let my laptop's battery drain to 2% battery before pluging it into the charger to recharge but ubuntu acts funny around 3% and only 3%. When it gets that low, it locks my laptop to ...
1
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0answers
9 views

Why can't I select Suspend as on-lid-closed action for AC?

When I go to "Power" and try to select "suspend" when laptop lid closed, on AC power, I find that suspend is greyed out, disabled. I don't understand why. Suspend works fine when on battery. I'm ...
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0answers
10 views

Screen pauses every 7 seconds with Radeon Open Source Drivers

This is a clean install of 14.04.02 on my HP Laptop. The laptop,a dv7-4045ea, has dual Radeon graphics cards a HD4200 and a HD5650 which cannot be controlled in the BIOS and cannot use fglrx drivers. ...
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1answer
10 views

¨USB device: card reader¨ draining battery even if not used

Ive installed ubuntu on my macbook pro retina 13 and im triyng to get the best battery life possible. Im using powertop to manage what needs to be changed and pm-utils to save power. powertop says ...
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0answers
6 views

Intel P-State: Stuck at 900 Mhz after unplugging power supply, even if plugged in again

when i start my laptop without power supply or unplug it later, the frequenzy gets stuck at 900 Mhz. If i change the governor to performance it is stuck at 2.5 Ghz. After a restart it works as ...
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0answers
24 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
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1answer
19 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 ...
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0answers
32 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 ...
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1answer
16 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
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1answer
47 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 ...
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0answers
11 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 ...
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0answers
21 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
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1answer
33 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 ...
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0answers
14 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" ...
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0answers
18 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
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0answers
33 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 ...
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0answers
35 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 ...
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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
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1answer
44 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
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0answers
28 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 ...
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0answers
54 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
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1answer
78 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 ...
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0answers
31 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 ...
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0answers
14 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
25 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 ...
1
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1answer
23 views

APM best settings

I mean this one: What's the best setting for this? Best for performance. Thanks!
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0answers
20 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 ...
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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.
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2answers
64 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 ...
1
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1answer
41 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 ...
2
votes
1answer
61 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. ...
13
votes
1answer
581 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
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1answer
34 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 ...
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0answers
18 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
130 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
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0answers
31 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 ...
3
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0answers
39 views

Battery indicator disappears on connecting the power

I removed Unity and installed Gnome on Ubuntu 14.04. Now the battery indicator disappears on connecting power. The indicator-power-service appears to be there but it isn't working. On running it from ...
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2answers
65 views

How do I turn off battery charging in Ubuntu?

I mainly work on AC power. Therefore Windows has the below utility to improve battery life for my scenario by disabling battery charging: How do I achieve this in Ubuntu? Thanks in advance!
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0answers
43 views

What is the proper/recomended way to handle laptop power management in Ubuntu?

I have seen many power management utilities/methods for Ubuntu. These are few of them: TLP CPU Power Scaling indicator-cpufreq cpupower Using powertop command Using laptop-mode-tools Intel i915 ...
0
votes
1answer
28 views

How can I get a visual indication if I muted audio and the battery power is running out?

Is it possible to show a flickering or something else to indicate the shut-down process is nearby instead to get my attention with beeps? Ubuntu Gnome here.
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0answers
45 views

Xubuntu automatic suspend doesn't work

When I set xubuntu on my Asus Eee PC 1015BX to suspend after 15 minutes of inactivity, after that time I get "Power Manager not authorized" notification and it doesn't suspend. I had the same problem ...
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0answers
23 views

Is it possible to turn off Thinkpad dead battery led indicator?

I have old Thinkpad T61 with ubuntu 14.04LTS. Battery is completely dead (orange light is blinking all the time). But I don't want to replace it. I would like to turn off that indicator? Can it be ...
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0answers
72 views

Ubuntu 14 LTS server going to sleep/shutdown

We recently transitioned from Ubuntu 12 to Ubuntu 14 server installations and started to notice that the servers are occasionally go to sleep after couple of hours to days intermittently. ...
0
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1answer
38 views

Changing the command executed using suspend/standby in 14.04 LTS

I had some problems with my Thinkpad X200T not suspending under 14.04 LTS, after trying different solutions, it seems the easiest fix is to just execute sudo pm-suspend How would I go about making ...
1
vote
3answers
360 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 ...
0
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1answer
115 views

Wireless Power Manager Problems in Ubuntu 15.04

I've only recently upgraded to Ubuntu 15.04 from 14.04 and I noticed, unlike 14.04, my wireless power manager was turned on by default. It turns off ok with the sudo wlan0 power off But is back on ...
1
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1answer
70 views

how to make hibernate work on 14.04?

My Ubuntu is 14.04 on Thinkpad T400. I try to run the following command for hibernation: $ sudo pm-hibernate It flashes and then return back to normal. Running pm-suspend-hybrid also ...
1
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2answers
109 views

What does “inactive” mean in “suspend when inactive for xxx mins”?

In system settings -> Power, what does "inactive" mean in "suspend when inactive for xxx mins"? If my laptop am running a hours long backup program while i am sleeping, is that considered ...
0
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2answers
21 views

What is the difference between the various methods of suspending in 14.04?

Are the following ways of suspending 14.04 the same? Choose menu for suspend close the laptop lid cover run pm-suspend. What are their differences? Any suggestions on when to use which?
0
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1answer
29 views

How is “thaw” different from “resume”?

In power management, what is "thaw"? How is it different from "resume"? Thanks.