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• What are the essential considerations for setting up systems in a location with unreliable power?

  - by dunxd

  I deal with a lot of remote offices located in parts of the world where the local grid power supply is unreliable. Power can go off anytime with no warning, with outages ranging from minutes to days Power fluctuation is wild, with spikes and brown outs Currently the offices will have some or all of the following: A generator, with an…

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• Will an Australian power adapter with an American plug charge a Laptop safely?

  - by leeand00

  A friend of mine has a laptop that she brought from Egypt to America, and she is afraid to charge it. She told me the laptop was purchased in Australia and it has a plug like this: And the power adapter reads The relevant text on the power brick reads: Wide Range Input 100-240V-1.7A(1.7A) 50-60Hz 18.5(18.5V) = 3.5A(3.5A) 65W …

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• power and modulo on the fly for big numbers

  - by user unknown

  I raise some basis b to the power p and take the modulo m of that. Let's assume b=55170 or 55172 and m=3043839241 (which happens to be the square of 55171). The linux-calculator bc gives the results (we need this for control): echo "p=5606;b=55171;m=b*b;((b-1)^p)%m;((b+1)^p)%m" | bc 2734550616 309288627 Now calculating 55170^5606…

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• With a typical USB hard drive enclosure, is the full range of drive power management functionality available?

  - by intuited

  In what may be an unrelated matter: is it possible to suspend a PC without unmounting an attached USB-powered drive, and then remounting it on resume? This is the behaviour I'm currently seeing (running Ubuntu linux 10.10). Are there certain models or brands that provide more complete control over this aspect of drive operation? My…

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• Must Keep the Power Flowing No Matter What! [Humorous Image]

  - by Asian Angel

  Who cares what it looks like as long as it works, right? Have you seen or created similar “quick fixes” to keep a computer running? Make sure to share your story in the comments! Barely Working Laptop Cord [Cheeseburger Network] 6 Ways Windows 8 Is More Secure Than Windows 7 HTG Explains: Why It’s Good That Your Computer’s…

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• ubuntu 12.04: Why my laptop is consuming more power than 11.10?

  - by sanz

  I had 11.10 X86 on my Asus laptop (sandybridge, Nvidia 520M). I had 8 hours' battery life with Bumblebee and Jupiter. Average battery discharge rate was around 10w. Later I changed, not upgraded, to 12.04.1 AMD64. I installed Jupiter. But there is no "restricted drivers" available so I guess Bumblebee will not work. So I removed…

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• How to turn off power management for external hard drive (Seagate GoFlex)?

  - by RPG Master

  I bought this 2tb Segate GoFlex this last Black Friday and since then every 15 minutes or so the drive spins down, and then a little while later completely dismounts. Very annoying. From what I understand you could turn this off using the including Windows and Mac only software. This function and what controls it isn't…

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• Computer turns off and on after start ..then goes dead

  - by Shiki

  I built a new PC from the following components: - CPU: Intel Core i7 950 - MB: Gigabyte X58A-UD3R - RAM: 2x2gb i7 Corsair memory - VGA: Zotac AMP2 GTX260 - HDD: 1 GreenSATA HDD (Western Digital 500gb RE2) When I turn it on, it goes for a few seconds, fans at maximum speed, then turns off. The again, it starts by…

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• (Why) are IEC C5/C6 connectors a necessity? Why not use C13/C14?

  - by Mike

  That's a question I was asking myself the first time I saw such a weird C5 plug. That was a while ago, but I came across it again and haven't found an answer yet. The only thing I could find out is that C5 is with 2.5A and C13 with 10A. But I guess it would technically be no problem building an AC adapter (e.g.…

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• Preventing battery from charging

  - by intuited

  I'm running on UPS power and would like to prevent the laptop's battery from charging, to increase the amount of power available to other devices. Is there a way to do this? update The machine is a Dell Latitude D400. If people want more details, just ask. Also, I'm gathering that I need to explain my…

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• What *exactly* gets screwed when I kill -9 or pull the power?

  - by Mike

  Set-Up I've been a programmer for quite some time now but I'm still a bit fuzzy on deep, internal stuff. Now. I am well aware that it's not a good idea to either: kill -9 a process (bad) spontaneously pull the power plug on a running computer or server (worse) However, sometimes you just plain have…

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• On a dual-GPU laptop, is using the discrete GPU ever more power efficient?

  - by Mahmoud Al-Qudsi

  Given a laptop with a dual integrated/discrete GPU configuration, is it ever more power efficient to use the discrete GPU instead of the integrated? Obviously when writing an email or working on a spreadsheet, the integrated GPU will always use less power. But let's say you're doing something…

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• High Power Consumption and Wakeups on my Asus X54H with 12.04

  - by Marogian

  So I've been using powertop to try and reduce the power consumption on my laptop as I only seem to get about 3 hours of battery. From reading other threads on here it seems my power consumption and wakeups are strangely high, here's a summary: The battery reports a discharge rate of 10.2 W …

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• Opposite method of math power adding numbers

  - by adopilot

  I have method for converting array of Booleans to integer. It looks like this class Program { public static int GivMeInt(bool[] outputs) { int data = 0; for (int i = 0; i < 8; i++) { data += ((outputs[i] == true) ?…

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• Which part of the computer needs all the power from the PSU?

  - by Xeoncross

  A couple years ago I was building a new Core 2 Quad system and after reading all the reviews was convinced that I would need at least a 400 watt power supply unit (PSU). I bought a 500W Antec EarthWatts However, last year I bought a Kill-A-Watt power meter to test some things around our…

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• Can a power failure or forceful shutdown damage hardware?

  - by Vilx-

  In an unrelated Internet forum I got into a discussion about hardware damage from forceful shutdowns (holding the power button for 5 seconds) and power failures. I was in the opinion that normal PC hardware does not suffer from this - after all, it's not much different than what they…

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• Problem with Graphics Card, Power Supply or Mother Board?

  - by Rick Siegert

  I have a problem that is driving me to the edge. My graphics card periodically looses power for a moment, then comes back. Once in a while it takes much longer, like 5 minutes. I have always tried rebooting during that period, since I don't know then. Black screen, with a no…

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• Does a Samsung G3 Station external hard drive stop working when power supply is too high?

  - by Cacovsky

  I have a Samsung G3 Station 2TB external hard drive (link to PDF specs here). It was working perfectly when I accidentally plugged it in my notebook's power source. The notebook's power source is 19V/3.42A. The hard drive's is 12V/2A and I know that, inside its case, there is…

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• Can a power failure or forceful shutdown damage hardware?

  - by Vilx-

  Can computer hardware suffer damage from forceful shutdowns (holding the power button for five (5) seconds) or power failures? I believe that normal PC hardware does not suffer from this - after all, it's not much different than what they experience under a standard…

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• How can I guess if a USB cable will power my devices?

  - by rsanchez

  I've had problems with one long (4 meter) USB Mini-B to USB Type-A cable not being able to boot a 2.5'' external hard disc due to not supplying enough current. On top of that, the cable used a Type-A to Mini-B adapter for the Mini-B part, which probably made things…

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• Power supply issue? New Radeon5850's fan runs at full speed and PC doesn't boot.

  - by Kris

  I recently bought a new ASUS EAH5850 graphics board. I installed it a custom PC which had an ASUS p5n-e SLI mobo along with a 500w Thermaltake W0093RU power supply. Sometimes when doing a cold boot the 5850's fan will run at full speed and the PC will not boot.…

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• Power outage during disk wipe. What do I do now?

  - by Mark Trexler

  I was using Roadkil Diskwipe on an external hard drive and the power went out. I had removed it from any outlet connection by the time power was restored to prevent power-spike damage (it's on a surge protector, but I didn't want to rely on that). My question is,…

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• Suspend only works once after full power cycle with ASUS P7P55D-E Pro

  - by John Chadwick

  This one is strange. I can't seem to get suspend working more than once per power cycle. When I say "power cycle," I mean the only way to get one proper suspend is to cut power from the power supply and boot back up cold. After the proper suspend, I get a failed…

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• Hard Disk Spins Down as long as Battery is in Laptop

  - by Brock Dute

  Hi, I just figured out today that as long as the battery is in my laptop, it doesn't matter if it's fully charged while plugged in, Ubuntu always spins down my hard drive. I noticed this because there was a huge difference in speed when I removed the batteries.…

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• Power button missing

  - by Christophe De Troyer

  An almost clean install of Ubuntu 13.10 keeps hiding the power button. I noticed before that my clock and power button were missing in the right top corner. I rebooted my system and they were back. Now I see my power button only is missing. How do I go about…

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