Advanced Configuration and Power Interface, a standard for power management in operating systems.

learn more… | top users | synonyms

356
votes
7answers
22k views

How does a computer restart itself?

How can a computer restart itself? After it's off, how does it tell itself to come back on again? What kind of software is it that can do this?
15
votes
4answers
9k views

What is keeping my PC from sleeping?

How can I find out why my laptop or desktop won't automatically go to sleep
9
votes
1answer
6k views

What do the power management tools in Linux do? (acpi, pm-utils, etc…)

I am really really confused about the power management tools available for Linux: I have Arch Linux with XFCE on my laptop. The guides on the the Arch Linux wiki list acpi acpid pm-utils cpufreq ...
7
votes
3answers
2k views

My computer reboots when I tell it to shutdown

There are about 40 computers at work with this problem. They all have an ASUS P5KPL/1600 motherboard. They are all running SUSE Linux 11.1. When I tell the computer to shutdown either through the UI ...
7
votes
2answers
632 views

Laptop sleep: How to go into S3 easily?

Laptop: Fujitsu-Siemens Amilo Pi-3525 OS: Vista When my laptop is plugged in and I close the lid, it goes into S1 sleep. This means that there is still: fan noise (annoying when trying to sleep at ...
5
votes
3answers
29k views

What features does enabling ACPI 2.0 support in BIOS enable?

So I was booting up my box and for some odd reason my BIOS had lost settings (again), thus resetting everything to defaults. I was digging around making sure things were configured to my liking and ...
5
votes
1answer
1k views

will boot command params acpi=off or acpi=noirq ruin my hardware?

Dell xps 15z here. Really, really trying to install linux distro to dual boot from. first goto is bt. cant even get past 'initramfs live media filesystem not found' on usb boot. next was ubuntu, ...
5
votes
1answer
2k views

System (ACPI.sys) is always using about 15-20% of my CPU

I have a 13" Sony Vaio laptop (model SVS13A1C5E) and I upgraded it to Windows 8 with a fresh install, after upgrading I installed Win8 drivers listed here. Now I have a problem with the CPU usage (it ...
5
votes
3answers
2k views

Keyboard doesn't work after Windows resume from sleep (S3) — how to fix?

I have a weird issue with my keyboard after resuming from S3 sleep: I can type perfectly for maybe 5 seconds, but afterwards the keyboard ceases to work until I hibernate or restart (or sleep again -- ...
4
votes
4answers
5k views

Prevent poweroff on Debian when the physical power button is pressed

I'm on Debian-Lenny. I want to change the action taken by the system when the power button is pressed. How do I modify the system such that it does not power off when it gets an Power Button ACPI ...
4
votes
1answer
1k views

How can I convince my ASUS EEE B202 to boot, when the power is returned to its power supply

My little home server 'sulks', when it loses power. Instead of booting, when the power is returned, it waits for me to press its power-button. Is there a way to have it boot without human ...
4
votes
1answer
697 views

Difference between suspend to “mem” and pm-suspend

What is the difference between echo "mem" > /sys/power/state and pm-suspend Both can put the computer to sleep mode. I want to execute a script automatically when the system resumes from ...
4
votes
1answer
3k views

Windows 7 does not 'wake up' from Sleep mode

I'm new to Windows 7, so I don't know if this is normal. When the computer is idle for 30 minutes, the screen goes black and no key pressing or mouse movement will bring the computer out of standby. ...
4
votes
1answer
1k views

How can I tell Windows or Linux to put a specific (PCI[e]) device into sleep/off (D3) state?

How can I tell Windows or Linux to power a specific device (e.g. USB controller, network card, video card) down, that is put it in the D3 state? From the very little I know about ACPI and such, the ...
4
votes
2answers
759 views

Skip all warning prompts on ACPI shutdown?

When I issue an ACPI shutdown command to a Windows XP guest machine from the host VM server, I want Windows to shutdown. The problem is, Windows always wants to ask some question or another, rather ...
4
votes
2answers
522 views

How can I convince Windows 7 to reboot upon hibernating rather than powering down?

I have a Linux and Windows 7 dual-boot setup on my PC and I would like to configure the OSes so that when working in one OS, I can hibernate (saving the state to disk), reboot, use the other OS, ...
3
votes
6answers
9k views

Suspended Laptop Cannot Wake Up - Ubuntu

I've got an ASUS G73JH, and whenever I suspend it or hibernate it, it will not wake up. The screen stays backlight but is black. The fan remains running, however the HDD does not, not disk activity is ...
3
votes
3answers
273 views

What circuitry displays battery status in laptops

Which circuitry in laptop is responsible for showing the battery status/charging etc in a laptop? My intension is to hack such a circuit inch a desktop to show the status of a standalone UPS. I am ...
3
votes
2answers
4k views

How can I manually control a fan from the terminal?

I'm trying to control the fan speed on my desktop, and I'd appreciate your help. Goal: Use a script to control the fan speed on my computer. Motivation: The embedded BIOS "Smart Fan" settings isn't ...
3
votes
1answer
294 views

What does an ACPI BIOS configure during boot?

When a PC boots with an ACPI BIOS, what does it exactly do? I understand that the point of ACPI is to allow the OS to control hardware resources and power management but before the OS is loaded ...
3
votes
1answer
387 views

Windows 7 Wakeup from Sleep then Shutdown

Is this caused by low battery? I have an Asus UX31A, and I left it unattended. As usual, in 5 minutes, it went to sleep mode with the lid still open. I came back a couple hours later, and I noticed ...
3
votes
3answers
618 views

New HP Mini 2140 netbook battery wrongly reports 40% wear after 2 months of usage

I'm using an HP Mini 2140 with Ubuntu 12.04 installed on it. Two months ago, due to the fact that my old battery lasted only for about 20-30 minutes, I bought a new battery, which reported a capacity ...
2
votes
3answers
2k views

Linux program to artificially create CPU usage

Since I own one of those Centrino based Core 2 notebooks that create annoying buzzing noises when idle (= entering C3 or C4 power saving states), I'm looking for a program that creates artificial CPU ...
2
votes
1answer
8k views

How do I make ESXi 5.0 to shutdown virtual machines when the physical power button is pushed?

I have a home NAS/DLNA server built out of an HP Micro Server with the HP branded VMware ESXi 5.0.0 build-623860 (free license) installed. Being a home media center I'd like it to be "manageable" by ...
2
votes
2answers
2k views

Ubuntu 11.04, CPU Throttling Works In Reverse?

I've got an HP EliteBook 8530p. I have run prior versions of Ubuntu on this machine, but I've recently formatted and put 11.04 on it. No matter what I try, the CPU throttling goes in reverse - when ...
2
votes
1answer
165 views

Determining Namespaces Not in the ACPI Spec

I am trying to determine how it may be possible to find documentation for namespaces that are not documented in the ACPI spec. I have an Asus uEFI BIOS v(3202) and I'm receiving kernel messages ...
2
votes
1answer
2k views

Is my computer in ACPI S3 mode?

I recently got a new motherboard for my Intel Core 2 Quad 9300-based PC (the old motherboard was fried). The old motherboard was an ASUS IP35 Pro, while the new one is a Gigabyte G41MT-S2. Since the ...
2
votes
3answers
2k views

Set fan speed by RPM on Thinkpad T420s in Linux

The only interface I've found for setting the fan speed with the thinkpad-acpi module, is setting pre-defined levels, 0-7. Example: sudo su -c 'echo "level 2" > /proc/acpi/ibm/fan' I would like ...
2
votes
2answers
742 views

Why does installing Snow Leopard on a x86 machine require patching the DSDT?

I have seen various articles that describe how to install various versions of MacOs on x86 laptops from HP, Dell, etc. Many of them refer to a need to patch the DSDT, and even recommend a gui DSDT ...
2
votes
1answer
155 views

Linux PC randomly halts [instant power off] and doesn't power back on power switch unless AC power is cut

my Linux pc is randomly powering off. the working configuration: ATI drivers (fglrx) not loaded cpufreq governor (either performance or powersave) and frequency are set at boot (default settings ...
2
votes
2answers
1k views

Laptop abruptly powers off after few seconds of booting

I have a 3 year old HP Pavilion dv2208 laptop. Recently it started abruptly powering off in like ~20-30 seconds into Windows boot sequence after almost every reboot/shutdown. Even if I leave it in ...
2
votes
1answer
588 views

“Bios Not fully ACPI compatible”

Why would a computer that has been working for month's suddenly start having a "Bios not fully ACPI compatible" blue screen error, when the bios has not changed?
2
votes
1answer
1k views

How to view ACPI RTC alarms?

My PC resumes at 8:30 when it's in standby mode, and I would like to check if there is an RTC alarm that causes it. How can I view currently set alarms in Windows?
2
votes
1answer
207 views

Power states in Windows

Does anybody know or have a link to documentation on how the Power Manager of Windows, determines to go to the ACPI power states S1-S4? Are there any settings that can be configured? I know that by ...
2
votes
2answers
811 views

Can't boot system without acpi=off

Is there any solution to run fedora 19 on my laptop (Asus x61s) without acpi=off set and removing power management controll? If I remove this option, system hangs just after start booting. I never ...
2
votes
0answers
161 views

Need noacpi in CentOS 6.4, not in RHEL 6.4

I've been trying to fix a rather odd problem that I've seen on our new Dell R5500 (Xeon based workstations). We want to run CentOS 6.4 64 bit on them. We did a base install which worked fine, however ...
2
votes
1answer
314 views

Why does my DSDT table is different from what I found online?

I have found a field in DSDT table where I want to modify from here http://www.ztex.de/misc/c2ctl.e.html Generally, I want to modify the _PSS field about the processor so that I can have more ...
2
votes
1answer
639 views

What is Microsoft ACPI-Compliant System and why are there so many IRQs for it?

I' m a Windows newbie because most of my time I use Linux systems so this question may seem stupid. As far as i know there are only 16 IRQs (0-15) and it is chipset - dependent (APIC controller).But ...
2
votes
0answers
339 views

Is it possible to install Windows 8 on a non-ACPI computer?

I have a computer with a BIOS that doesn´t support ACPI. I tried to install Windows 8 but the setup said I cannot install Windows 8 without ACPI. After some research I found out that this is since ...
2
votes
0answers
287 views

Acer Aspire Laptop won't charge in Windows 7 Home Premium x64

I have an Acer Aspire 7750-6801 laptop running Windows 7 Home Premium 64 bit OS. The issue is that it will only charge sometimes when plugged in. I thought it might be a hardware issue, so I tried ...
2
votes
0answers
614 views

Samsung NP530 CPU stuck at 55 C temperature

I have run into heating issues on my ultrabook running Linux. Idling temperature for Win7 is ~45 C, while in Linux it is ~55 C. Output of sensors rohit@raijin ~ $ sensors acpitz-virtual-0 Adapter: ...
2
votes
1answer
118 views

Estimated power draw for different power states?

What would be a raw estimate of the power draw of a semi-modern desktop PC, in different sleep states? Will the suspended state (with powered RAM) draw much more power then the PC in hibernation ...
2
votes
1answer
2k views

Ubuntu 10.04 Keyboard and Mouse Freezing Problem

I had a partition setup with Windows XP and Ubuntu 8.04 dual booting. I recently upgraded to Ubuntu 10.04 by installing fresh from CD but leaving the previous /home folder as is. Things seemed to be ...
1
vote
2answers
696 views

Auto-start computer from shut down state

Is there any way to start a computer at scheduled time when it is Shut down. I know how to start it when it has been put into Hibernation.
1
vote
2answers
512 views

How to sigstop/sigcont processes based on CPU temparature?

I'm temporarily forced to work on a laptop whose fan has failed. Under light load it works fine, but as soon as I start computationally intensive jobs, the temperature raises very significantly, even ...
1
vote
2answers
402 views

Is it possible to wake up an ACPI S3 suspended Linux System with an SMB packet?

I want to put my Debian NAS system in supend to RAM mode (ACPI S3) after a decent period of time idling in order to save some power. I thought about putting the NIC in a mode, where it waits for ...
1
vote
4answers
93 views

repeatedly power on/off server or letting it run through

I run a PC at home that I want to access from remote when I am travelling. The minimum requirement is that I can access it once every day (if I can access it more often the better of course). I can ...
1
vote
1answer
243 views

ACPI vs Gnome-Power-Manager

I ran acpi on the terminal and it said 20 mins before the battery is fully charged. But gnome-poower-manager applet says 40mins. Which one is a better estimate?
1
vote
1answer
1k views

Tool for making fn-x buttons work? Archlinux, handler.sh

This just seems like such a normal thing to work. I know that this works out of the box on Ubuntu. But not in Archlinux. I would like to think that there is a tool in existence that would use ...
1
vote
1answer
182 views

Disable CPU halt state to prevent BSOD/KSOD

I have recently had problems with my Windows7 desktop bluescreening several times per day (with many different STOP codes) and occasionally blackscreening. Because it is still under manufacturer's ...