Questions related to power management, particularly power saving measures.

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5 views

USB and PCI devices taking a LOT of power

So I ran powertop on my laptop and saw that I have a lot of devices that are draining power on full speed the whole time according to the program. As you can see there a lot of things taking 100% ...
5
votes
2answers
57 views
+50

Notebook wakes up from Standby

I have an Acer Aspire V5 Notebook with Ubuntu 14.04 installed on a SSD an Windows 8.1 on a HDD. I experience that my Notebook wakes up from standby randomly after a certain time (can be a few ...
4
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1answer
26 views

Advanced power options for lid closing

I have ubuntu 14.04 installed on my dell e5440. What I'm trying to do is to make my computer suspend when I close the lid when I'm plugged in and hibernate when on battery power. What I've managed so ...
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0answers
14 views

hibernation at critical battery level not work

I use this tutorial (hibernation enable) to put my Ubuntu 14.04 in hibernation. All works well if I put my notebook in hibernation manually. But I need at critical battery level it's put to ...
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0answers
5 views

tp_smapi on the Lenevo Thinkpad T440p (or just battery thresholding)

I'm trying to get the tp_smapi module working on my Thinkpad T440p for battery thresholding with tlp. However, when I run sudo tlp-stat -b it returns tp-smapi = inactive (kernel module 'tp_smapi' ...
1
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1answer
431 views

Reduced battery life with ubuntu 15.04

I'm using a Lenovo Z-5070 Ci7. I had a battery life of nearly 4 hours when I was using Ubuntu 14.04 LTS. After updating to Vived Vervet (15.04) my battery life is reduced to nearly 2 to 2.5 hours. ...
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0answers
22 views

Ubuntu 15.04 suspend loop bug

I'm having the same bug as listed here: https://bugs.launchpad.net/ubuntu/+source/dbus/+bug/1450013 and here: When I install Ubuntu 15.04 the computer hibernates but changing to ...
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3answers
7k views

How to turn off screen (DPMS) together with locking session in KDE?

First of all, I'm aware a similar question for GNOME is asked here: "Switch off laptop backlight when locking screen". Objective I would like to turn off my screen on locking the session for power ...
1
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1answer
24 views

Battery suddenly not charging anymore

I have a relatively new ASUS F451MA. I had already updated the BIOS to the latest version before the problem appeared. I have opened up my laptop and tried to reset the battery by taking it out and ...
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0answers
88 views

Ubuntu 14.04 LTS battery indication wrong when unplugged

I just installed Ubuntu 14.04 LTS on my Asus R500V. When I used Windows 7, my battery would last for over 3 hours, but with Ubuntu the battery drains quickly per my battery indicator. Now the ...
0
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1answer
26 views

Wifi power management turns back on when connecting

I've been having wifi connectivity issues, and I've narrowed the problem down. Wifi power management seems to mess with my connectivity. I can turn it off with: sudo iwconfig wlan0 power off But ...
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0answers
36 views

Ubuntu 15.04 Suspend not working. System resumes automatically a few seconds after suspend

System properly suspends when clicked on Suspend but Wakes up automatically after a few seconds even without pressing any key or power button. sudo pm-suspend also not working anymore. sudo ...
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3answers
3k views

How to permanently save powertop's suggestions?

So it's ok that if I run powertop then it suggest me to disable xy, etc., but after I exit powertop, reboot the pc, and start it again[powertop], it brings up the same tips again! So how can I ...
0
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0answers
22 views

Network Card Refused to change power state after resume from suspend in 14.04, worked fine in 12.04

The ethernet wouldn't work after resuming from suspend, this was not the case in 12.04 after upgrading to 14.04 it happens all the time. Looking at the dmesg output after coming out of suspense it ...
1
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0answers
20 views

I want to charge an iPod while in Suspend

Sony Vaio VGN-FW250j Intel Core 2 Duo P8400 dual boot Win 7 / Ubuntu 15.04 I am able to suspend and hibernate this laptop in both OSes. Ubuntu will not allow me to use the USB ports to charge my ...
2
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1answer
6k views

How to permanently set CPU power management to the powersave governor?

I'm currently using this: cpupower frequency-set --governor powersave but it resets after each reboot.
1
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0answers
14 views

Suspending when CPU idle

I am using 14.04 (Trusty). I have Power -> Suspend when inactive for 2 hours. This works fine if I am logged in and then walk away. But if I am not logged in, it never suspends. Moreover, I understand ...
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0answers
20 views

battery is not being charged or used

My battery is 89% charged, but as soon as I pull out the power cord from my laptop the laptop electricity supply is killed (and the computer shuts down). Here are my battery stats: So basically, ...
3
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1answer
178 views

PowerTOP: what is “System baseline power”?

I'm running Ubuntu 13.10 on a MSI gs70 Stealth laptop. When I run powertop 2.4 it tells that (Device stats tab): The battery reports a discharge rate of 39.8 W System baseline power is estimated at ...
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0answers
25 views

Ubuntu getting suspended 5 seconds after showing log on screen

Ubuntu getting suspended 5 seconds after showing log on screen. After I wake it, there is no problem. In log I noticed a mem sleep initiation. also the problem was there when I chose try Ubuntu at the ...
4
votes
1answer
424 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 ...
0
votes
1answer
27 views

Automatically shutdown when switching to battery

I'm recently made my old laptop into a server using Ubuntu Desktop 15.04. But because my laptop has an almost dead battery I want Ubuntu to save all data that it's on (or at least close the running ...
6
votes
3answers
5k views

Intel Corporation Wireless-N 7260 card dies randomly

On Ubuntu 14.04 32bit, after some up-time my wireless card stops working. Sometimes it helps to stop WiFi in the nm-applett (at the top right corner) and restart it to get a new connection to my WiFi, ...
38
votes
2answers
28k views

Ubuntu Server 13.10 now goes to sleep when closing laptop lid

I recently upgraded to the latest version (13.10). I have it running on an old laptop. Since the upgrade, whenever I close the laptop lid, it goes to sleep mode. Any idea on how to fix? I've ...
0
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2answers
2k views

Suspend USB power to a laptop cooling pad when going to suspend mode

When I suspend the laptop, the USB devices are left on. I don't mind this in general, however I'd like to be able to turn off the cooling pad under it. I tried the things outlined in the following: ...
0
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1answer
44 views

Unable to load tp_smapi on Thinkpad w541

I have a Lenovo Thinkpad w541 with Haswell Procesor (i7-4810MQ ). I am unable to load the a Thinkpad module for battery improvement. joselugo@joselugo:~$ sudo tlp-stat -b --- TLP 0.7 ...
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0answers
62 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 ...
10
votes
3answers
13k views

How do I prevent an external monitor from shutting off when closing my laptop lid?

I've seen this issue on previous versions of Ubuntu, but not on 12.04 and some of those are resolved bugs, so I'm asking again. I've set up power management so that, when plugged in, my laptop does ...
1
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3answers
1k views

How to write a script to “listen” to battery status and alert me when it's above 60% or below 40%?

I want to make a tool that alerts when battery is below 40% or above 60% so I can start/stop charging accordingly. I know some tools alert when battery is low, that's not enough. Is there a tool that ...
7
votes
6answers
14k views

Keep Ubuntu Server running on a laptop with the lid closed?

I decided to use my Eee PC 1001HA as a home server. I have it connected through Wi-Fi to the router, running Ubuntu Server 12.04. Everything works fine except this annoying problem: when I close the ...
20
votes
2answers
34k views

How do I monitor power consumption?

The powertop program shows the power usage, but only after about five minutes. Before that, it shows: no ACPI power usage estimate available That's one of the limitations of the powertop ...
3
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4answers
744 views

Ubuntu 13.10 on Thinkpad slows down dramatically when power adapter is plugged in

When I plug in my power cable -- sometimes -- Ubuntu 13.10 immediately slows down in just about every way. This has been happening for months, but I only recently finally connected the dots, in part ...
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0answers
43 views

Is there any way to make Ubuntu not to suspend while a download in progress?

Is there any way to set the system not to suspend while a download in progress but only turn screen off?. My OS is Ubuntu 15.04.
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0answers
14 views

to to set /sys/bus/usb/devices/…/power/ ON by default on all the USB devices?

I have about 9 USB devices plugged in. The issue is that when I add more they sart to disconnect inconsistently. After some research I've found that /sys/bus/usb/devices/.../power/ [0] could be the ...
1
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0answers
44 views

Ubuntu 14.04 turns off after unplugging the charger

I have problem with my Ubuntu 14.04. Every time I unplug the charger, the system is shutting down. It occurs only, when the charger is unplugged from computer, but not when unplugged from the power ...
0
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0answers
34 views

CPU frequency reset to maximum value by unknown process

I run the following Bash script to set the CPU frequency to idle at a lower speed: for i in $(seq 0 7) ; do sudo cpufreq-set --min 1200000 --governor conservative --cpu $i ; done I can then monitor ...
0
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0answers
25 views

CPU Governor Not 'Idling' After Kernel Update

Last night, my laptop running Ubuntu 14.04 asked to update the kernel to 3.16.0-43. I noticed this morning that Conky is now reporting that my CPU is running around max all the time now. Before ...
2
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1answer
37 views

systemd: How to modify the HandlePowerKey action with a custom command?

My headless server has a power button. When the user presses it, I want the server to respond with a brief beep, then shutdown the server. The system should only beep when manually pressing the ...
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0answers
28 views

what command can maximize power saving and half the processor speed for Ubuntu software TLP

I've recently installed Ubuntu 15.04 alongside windows 7. I gave 30gb disk space for Ubuntu. I've also installed TLP for power management. Now what command do I have to maximize power saving, reducing ...
1
vote
1answer
3k views

Message {1.079026} ACPI PCC probe failed; starting version 219

I am running Ubuntu 15.04 (Vivid Vervet) with 3.19.5-031905-generic #201504211114 kernel and GNOME Shell 3.14.4 on a Samsung NP370R4E laptop. When I boot up, I see [1.079026] ACPI PCC probe failed ...
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0answers
30 views

Error after suspend/resume. Ubuntu 14.04

When I close a lid of my laptop and open it up, I've got errors after suspend/sleep mode and then normal login screen. There are something like "unclaimed register writing to ...", "error 19 on ...
44
votes
3answers
2k views

How to get the “Your battery is broken” message to go away?

Every time I turn on my computer, I see a message saying something like: Your battery may be old or broken. I am already aware that my battery is bad. How do I suppress this message?
0
votes
1answer
13 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
14 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
145 views

Battery Threshhold

I recently installed Ubuntu 14.04, which is really nice but my battery is not charging past 59%. I recall tinkering with Lenovo battery management on Windows to reserve the life span but I wiped ...
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0answers
18 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. ...
0
votes
1answer
33 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 ...
3
votes
2answers
323 views

Does Systemd read /etc/pm/…?

Do systems using systemd read and execute scripts in /etc/pm/sleep.d/ ? I'm starting to concluded the answer is that systemd ignores these scripts. If this is true what is the replacement? Update: ...
4
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3answers
3k views

How to shutdown Ubuntu after (2 hours) of idle?

Running: Xubuntu 14.04 32bit. I have read several outdated, not working, working different that I want answers here and elsewhere. I had a script that resulted in shutting my Laptop down at boot time ...
0
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0answers
12 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 ...