Systems to manage power consumption, such as system suspension and hibernation, CPU speed adjustment, disk spindown, battery usage monitoring, …

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Is it safe to use the -y and -Y flags to hdparm?

Is it dangerous to use the -y or -Y flag in hdparm during a write, or when the disk is still mounted, or will hdparm refuse to spin-down, or automatically sync and unmount?
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0answers
848 views

Where are pm-powersave settings on OpenSUSE 13.2, and are they used?

I am trying to sort out powersaving for OpenSUSE 13.2 running on a laptop. I found this guide: https://en.opensuse.org/Powersaving for understanding Powersaving on OpenSUSE. However, it appears to ...
2
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0answers
46 views

how to identify process which blocks suspend/hibernate

I have an intermittent problem with a laptop that doesn't sleep/hibernate after lid is closed. And I have no idea why. I suspect that some process blocks sleeping/hibernating. How can I identify ...
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0answers
162 views

CPU load and power management (frequency)

question background In my understanding the load value (shown e.g. by top) allows (together with the knowledge how many CPU cores the system has) a very quick assessment which share of the ...
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0answers
145 views

How to measure power consumption of a USB device?

The title says it. It has been asked how much power a port can deliver, but I do not need that. I need to get the power consumption of a plugged-in device in real time. This question was left ...
9
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1answer
428 views

How to prevent the Linux kernel from waking a secondary HDD from sleep

Is there a way to instruct the (Linux) kernel not to wake up a secondary hdd after a system sleep/wake-up cycle? I'm asking because in my laptop I have an SSD as a primary drive containing the system ...
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1answer
211 views

How do I immediately put a drive to sleep (without changing its power setting configuration)?

Within GNOME's "Disks" utility there is the option to immediately put a drive into sleep / standby, which spins down the platters. I would like to do this on my servers before pulling hot-swap drives ...
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0answers
470 views

indicator-cpufreq in arch linux

I'm an Ubuntu user testing out Arch Linux. So far I'm happy. On Ubuntu I used the indicator-cpufreq applet to control power profile both on Unity and Gnome-shell. On Arch, I cannot figure out how ...
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1answer
583 views

What is the suspend procedure in KDE?

I've been reading this question, and I'm wondering what is the procedure for suspending in KDE? Whether to RAM or to disk.. When I click suspend, or close the lid, what gets triggered? What is the ...
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0answers
75 views

Possible not restore cpu frequency after suspending and waking up?

When I suspend my Ubuntu 12.04 and wake it up, the cpu frequency I set by clicking indicator-cpufreq on the desktop panel will be restored. I wonder if that is a bug or some design? Is there a way to ...
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1answer
446 views

what does pm-suspend-hybrid do?

man says pm-suspend During suspend most devices are shutdown, and system state is saved in RAM. The system still requires power in this state. Most modern systems require 3 to 5 ...
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1answer
389 views

get system uptime on battery?

How to know system uptime under battery ? so that i can get exact time of battery backup the uptime shows complete uptime (AC/Battery) NOTE : I am using linux Mint 17.
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1answer
120 views

xscreensaver sometimes unlocks locked screen automatically, after returning from monitor standby mode

I am using xscreensaver to lock my screen. Additionally to that, my monitor goes to "standby" , i.e turn display off, after 30 minutes of inactivity. It has happened to me twice now, that I have ...
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1answer
438 views

Auto-hibernate with udev rule

I'm using Debian Jessie with systemd. In the past I've used an acpid script that let's my computer hibernate when the battery is 5% or below. In an attempt to make a replacement for that I've made ...
0
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1answer
324 views

Role of the Intel P state driver

I searched high and low for what “Intel P state” is and what it does. I found out that it has to do with performance and power consumption. I learned that if you build it in the kernel, it'll becomes ...
2
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1answer
374 views

Display power management in console

When in console (i.e. not in Gnome or KDE) the display will automatically power down in case of inactivity. It seems to me to be set to something around 30 minutes. This power management is completely ...
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2answers
5k views

Powertop tunables: what does it do?

I just installed Powertop 1.98 on my laptop (T420 + FC15). There is a section called "Tunables". Half of my devices show as Bad. I see I can toggle from Bad to Good? What this section is for? What ...
2
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1answer
414 views

Prevent Mint from suspending while playing music in Spotify

In Linux Mint 17 I have Suspend when inactive for under Power Management set to 10 minutes. The problem is that the system suspends even when I'm listening to music using Spotify. Is there any way ...
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2answers
341 views

Suspend to RAM not working

I get following error when I try to suspend my laptop: failed to check authorisation: GDBus.Error:org.freedesktop.DBus.Error.Service.Unknown: The name org.freedesktop.PolicyKit1 was not provided by ...
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1answer
119 views

Powerbutton freezes applications

I've just installed Debian Jessie and I'm trying to get systemd to do basic power management. systemctl suspend and systemctl hibernate works well to suspend and hibernate the system. Now, I want ...
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2answers
533 views

How to reduce disk access?

This is a follow-up question to How to reduce temperature on a Dell XPS (L502X)?. After reading the answer, I noticed that my harddrive is spinning constantly, even when running TLP in bat-mode ...
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1answer
1k views

xfce4-power-manager not updating; ACPI finding an unknown battery but working fine?

I recently upgraded my Asus S56CA Ultrabook and unfortunately my battery indicator in xfce4 stopped working. I am running Debian 8 (Jessie). uname -a gives me this: Linux 3.14-2-amd64 #1 SMP Debian ...
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0answers
135 views

Disable USB drive from sleeping

I am loading fedora20 directly from a SATA drive connected via USB. The problem is that I will be working and all of a sudden the drive seems to have been put to sleep and nothing will work except ...
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1answer
19k views

Setting CPU governor to on demand or conservative

I'm struggling with cpupower on ArchLinux. I want to set governor to ondemand or even to conservative. First if I do $ sudo cpupower frequency-info --governors, I only get performance powersave. So ...
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3answers
940 views

Why kernel 3.6.2 is so much less energy efficient than 3.6.1 on Mint 13?

I noticed, that the power consumption in my ASUS P53E notebook is doubled (from 10W to 20W) when I change from kernel 3.6.1 to 3.6.2 (or later). I use Ubuntu Quantal mainline kernel from ...
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0answers
219 views

How to get notification from upower when UPS is on battery

I have a Fedora Core 19 system powered via a desk-side UPS. I've connected the UPS' USP port to the FC19 system, and it was apparently recognized, as upower -d now reports its presence: ups ...
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0answers
120 views

Linux Wifi High Power Consumption

I'm running Fedora 20, kernel 3.15.6 and ath9 driver with an ateros card. My battery life is very short, on an older debian install I had around 3 to 4 hours, now I'm between 1 and 2 hours. Powertop ...
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1answer
2k views

How to reduce temperature on a Dell XPS (L502X)?

Problem My Laptop is running quite hot (sensors reports ~50-60°C) during normal usage. In my opinion this is too high to work comfortably over long periods. Especially the region where I rest my ...
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2answers
546 views

Determine status of laptop lid

I have a weird problem where my laptop will wake when it's closed, generating a lot of heat and causing much frustration. Is there a way that I can tell if the laptop's lid is closed so that I can ...
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1answer
397 views

How to give more power to a USB device (error -110)?

I’m trying to mount an external hard drive (2.5", USB, no separate power supply) on Debian 7, but it gives me (in dmesg as well as when trying to boot with the device connected) errors like: ...
3
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1answer
232 views

How can I ignore KDE's power-saving features for certain programs?

I want to use KDE Power Saving capabilities on my Desktop computer, such as suspend and screen-off. But, I want these capabilities be enabled only when some programs aren't running; for instance, I ...
2
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2answers
885 views

How to increase the timer before drive spins-down?

I use Ubuntu 12 beta on a Lenovo Z575. I noticed that the disk spins down a few seconds after the last operation. When I am working, e.g. in the vim and write quite often, it spins-up and -down ...
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3answers
1k views

Which command to force a drive to spin up?

I've looked through the manual for hdparm, sdparm. I know there are arguments to spin down the drive, with -y and -Y. I also know there are arguments to control the power saving features, such as -S ...
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0answers
248 views

Nouveau power management with Nvidia Tesla graphics

I have a MacBook Pro 13" Mid 2010 with a Nvidia GeForce 320M (NV50 family (Tesla) according to this list). I installed Linux on this machine and wanted to use Nouveau as the video driver. Everything ...
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4answers
2k views

NetworkManager: disabled network when sending system to sleep

When I suspend my notebook, NetworkManager disables the wireless network (in nm-manager.c:do_sleep_wake). However, I'd love to still use the network for a very short time (to unmount cifs mounts, ...
2
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0answers
171 views

High varying discharge rate

I got an Asus N76VB notebook. On Windows I can easily stay on battery for 3-4 hours in powersave mode, but on Linux (first Ubuntu 14.04, currently Fedora 20) the battery's discharge rate varies from ...
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0answers
1k views

Monitor connected via displayport to DVI adapter won't sleep properly

I have a monitor connected to my machine that displays odd behavior when entering power saving sleep mode. When entering sleep, the monitor will alternate between blanking and displaying a default ...
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1answer
150 views

Disabling power management

I am running Cubieez on a Cubieboard2, I need to disable screen saver and power management, I've followed several tutorials about but none seems to work, I've written: xset s off. xset -dpms xset s ...
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2answers
78 views

Why does it temporarily look like the pv command transfer limit is no longer enforced when I come out of suspend to ram?

I have this perl script and I discovered the pv command and decided to use it to get some feedback into what is going on with the randomness in terms of throughput. After a few tests1 I decided to ...
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0answers
81 views

How do I find out what process is putting my machine to sleep?

My laptop is going to sleep after about 10 minutes of inactivity, and I don't know why. I verified the standard power options, are they're not set to put my machine to sleep. Here is grep's output ...
2
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1answer
57 views

Low brightness in a Intel Mobile GM956/GL960

I'm installing Debian stable (7.0) on a old Dell Vostro 1500 and I noticed that the brightness is always low. I've searched around and the only thing I've found is adding nomodeset ...
6
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3answers
1k views

How to find reason a notebook wakes up?

I'm having a problem with my notebook suspending, but then waking up when I don't want it to (either immediately, or much later when in the bag - I may have two issues to solve here). But for the ...
2
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1answer
5k views

How to change Power button shutdown action

I use Mageia ver 4 Linux as server, without X started and without any user login-in during normal operation. This PC has a special card for measuring and control of other devices. This card has its ...
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0answers
1k views

CentOS 6.5 will not sleep after period of inactivity

I've recently upgraded my Ubuntu 12.04 LTS to CentOS 6.5. This is a desktop PC (non-server) that I would like to sleep/power down after a period of inactivity. I have the following settings in my ...
2
votes
1answer
4k views

No hibernate option in power manager on Mint 16 MATE

In my fresh install of Linux Mint 16 with MATE, I have no hibernate option in the Power Manager; only suspend and shutdown. In the Quit menu I have hibernate as an option. Also sudo pm-hibernate ...
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1answer
505 views

TLP overrides auto-suspend configuration

On my ThinkPad x201, I've been having problems where the computer will shutdown once it has been suspended to RAM, so I disabled the auto-suspend when the lid is closed by editing ...
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1answer
133 views

Will a running program be killed if I suspend my OS?

I am running a program. If I suspend my OS (Ubuntu 12.04) in the middle, will the process of the running program be killed? If not, when I wake up my OS, how can I resume the process? Thanks!
5
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1answer
138 views

Writing a suspend-aware program in linux

Programs that depend on physical time, such as jackd and its clients, do not play well with software suspend of a laptop in linux. I would like to fix a client that starts issuing plenty of "timing ...
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3answers
15k views
4
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1answer
471 views

What program displays volume/screen brightness under KDE?

It seems there's some bug in KDE related to power management and after putting my netbook to sleep several times, plugging it in and out, the notification about screen brightness set to 100% doesn't ...