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• XFS and loss of data when power goes down

  - by culebrón

  Each time electricity goes down, my desktop (without UPS) loses some temporary information. Opera can lose settings, history, cache, or mail accounts (Thanks heavens I was wise to use IMAP). Partially or all together. a whole file (complete and save) in Geany appeared empty (and I didn't commit it to Git) rhythmbox lost all podcasts subscription data I'm afraid there are other losses I just didn't see. What's the reason? A memory files cache, a mem-disk? Or non-atomic file writes in xfs? I have Ubuntu 9.10 and XFS on both / and /home partitions. Is ext4 safer in such circumstances? I've seen ext3 is faster. Is it as safe as *4? Given that the apartment I rent is connected to a common bus and 1 safety switch for several apartments, and the neighbors - alone or together - overload it at least once every week, the lights go down often enough for this to be an issue.

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• Given power info on a CRT monitor, how can I calculate power consumption (kWh)?

  - by r0ca

  I have a Dell CRT Screen and the only info I have is this: AC input voltage: 90 to 264 VAC frequency: 50 or 60 Hz + 3Hz current: 1.5A max. (RMS) at 120 VAC; or 0.8A max. (RMS) at 220 VAC How can I calculate the energy consumption in Watt-hours for an hour (or better, a day)?

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• Power problem or fried motherboard?

  - by Scott

  I was trying to adjust an antenna on a wireless card and ended up pulling the card loose. Now the computer won't turn on. Did i fry the motherboard?

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• Computer Won't Boot After New Power Supply

  - by Haxelgem

  I recently bought a Rosewill 750-M PSU to replace an Antec Earthwatts 500. My computer worked fine before making the switch. After installing the Rosewill PSU, I attempted to boot. Fans spun up for a second, then turned off. After a second, they spun up again and stayed on. However, I had no video output. I put the old Antec PSU back in, and still had the same problem. I put another GPU in the computer, trying both PSUs, and still nothing. I switched out the monitor also, which didn't work. What should I do?

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• UPS for hard drive protection

  - by dimi

  I am in a place where electricity is not ideal (old house, no ground), sometimes it occasionally shuts down and supposedly there are some spikes. I consider using UPS with the goal to increase safety of my personal data. My first priority is the health of my internal and external USB hard drives which can be damaged due to possible power instability. I do not care that much about possible losses of not-saved work, instead I just want to let my system have a minimum time to turn off without any risk of physical damaging my hard drives. Would a cheap offline UPS suit my neads? Or do i need a better one with automatic voltage regulator (AVR)? How critical is AVR for the hard drives? The external ones require their own power supplies and will be plugged directly into UPS.

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• Automatically disable devices to save power and mitigate DMA attack in Windows 7

  - by Martheen Cahya Paulo

  Some OEM include energy saving apps that can switch off certain devices such as webcam or optical drive. Is there any brand-agnostic app out there that can do it? If the list of disabled device is customizable, it would be useful too for mitigating DMA attack (disabling Firewire, PCMCIA, SDIO, Thunderbolt, etc). Even better if it can recognize lock/logoff event, to mimic OSX behavior in mitigating the DMA attack.

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• Linux: disbale USB without disabling power

  - by Ergot

  TLDR I want toggle between the following usages of a usb-port via the terminal: use like a normal usb-port only supply energy to charge Story I recently got me something like a magna doodle that can save your drawings to pdf, which can be moved to your computer via usb afterwards. Now the thing is that you can't save anything while it's plugged in. Because it's the only way to charge it, it bugs me that I can't find a software solution and laziness I want to keep it plugged in and toggle the connection to the computer only when needed. I noticed that it's charging and usable when it is plugged in and the computer is shut down or suspened. So I guess that there's a way to do it. Tech info computer: ThinkPad X201 Linux Kernel: 3.14.5-1-ARCH "Magna doodle": Boogie Board Sync

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• Using a 20V power block on a 19V notebook

  - by user4444

  Is that dangerous : for the computer (without the battery) for the cells If possible, explain why. Edit : Here are some more assumptions : Without the battery included, there is no risk of overheating the cell, or over charging them. But there is still some dc to dc conversion taking place on the motherboard. I assume this dc to dc stage to be quite tolerant. What kind of trouble can I run into when using 20V instead of 19V ? Overheating ?

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• Using a 20V power block on a 19V notebook

  - by user4444

  Is that dangerous : for the computer (without the battery) for the cells If possible, explain why. Edit : Here are some more assumptions : Without the battery included, there is no risk of overheating the cell, or over charging them. But there is still some dc to dc conversion taking place on the motherboard. I assume this dc to dc stage to be quite tolerant. What kind of trouble can I run into when using 20V instead of 19V ? Overheating ?

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• How can I calculate power consumption of my PC in Watt?

  - by Jitendra vyas

  How can I calculate power consumption of my PC in Watt, to prove my House owner ( I live on rent) , my PC doesn't consume much power? He blames me for Huge power bills even he too use Fridge, A.C. etc and his son watch the TV all the time. We both share one Power meter so for bill we pay 50%-50% but He is saying I use PC all the time even night i keep on for downloading. I just want to calculate power consumption of my PC then will calculate monthly expense of unit as per my City's per unit price for power. I've Windows: Microsoft Windows XP Professional 5.1.2600 Service Pack 3 Memory (RAM): 960 MB CPU Info: AMD Sempron(tm) Processor 2500+ CPU Speed: 1399.0 MHz Sound card: Vinyl AC'97 Audio (WAVE) Display Adapters: VIA/S3G UniChrome Pro IGP | NetMeeting driver | RDPDD Chained DD Monitors: 1 - 17inch LCD - LG Screen Resolution: 1280 X 768 - 32 bit Network: Network Present Network Adapters: Bluetooth Device (Personal Area Network) #2 | WAN (PPP/SLIP) Interface CD / DVD Drives: I: ELBY CLONEDRIVE COM Ports: COM1 | COM2 | COM7 | COM8 | COM9 | COM10 LPT Ports: LPT1 Mouse: 3 Button Wheel Mouse Present Hard Disks: C: 29.3GB | D: 29.3GB | E: 97.7GB | F: 97.7GB | G: 211.9GB USB Controllers: 5 host controllers. Firewire (1394): 1 host controllers. Manufacturer: Phoenix Technologies, LTD Product Make: MS-7142 AC Power Status: OnLine BIOS Info: AT/AT COMPATIBLE | 01/18/06 | VIAK8M - 42302e31 Motherboard: MICRO-STAR INTERNATIONAL CO., LTD MS-7142 Modem: ZTE USB Modem FFFE CDMA #2

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

  - by Pawel Sawicki

  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 all my household members. This requires that it needs to be powered on an off (including all the VMs inside) by anybody with the physical access to the server by simply pressing the power button on the chassis. The "startup" part is easy to obtain - all I had to do was to configure the startup/shutdown policy: Once the server powers up, all VMs start as well and that's exactly what I need. Well.. it did work up until 5.0.0U1, but that's a different story: http://blogs.vmware.com/vsphere/2012/03/free-esxi-hypervisor-auto-start-breaks-with-50-update-1.html Unfortunately, pressing the power button doesn't gracefully shutdown the guest machines - they are terminated instead. If I run the "shut down" command from the vSphere Client interface guests are powered off. I'd like to get the same end result when the physical power button is switched. I've poked around a bit on the ESXi server. There's a "/sbin/shutdown.sh" script that seemed to do exactly what I need... but after trying it does exactly what the power off button. The "/etc/inittab" contains an entry for the "shutdown" level but I suppose it's not hooked to the power button. I can't find any acpi related configuration, neither do I know what exactly is executed when the power button is pressed. Does anybody have a clue how can I make the VMs shutdown automatically when the physical power switch is pressed to turn of the computer?

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• Why do manufacturers not show all hardware power usage?

  - by Drew

  I find it slightly more difficult to build a computer when I do not know how much power is needed for a component. When selecting a power supply for a computer, it is difficult to know how large of one to get. You don't want to go too large for cost reasons and circuit reasons, but you don't want to go too low and not be able to properly use every component. For instance, a graphics card might say "Minimum of a 500 Watt power supply. (Minimum recommended power supply with +12 Volt current rating of 30 Amps.)" But it really needs 360W (12V * 30A). So why don't they just say "Uses 360W max and xxxW peak"? Processors, I have noticed are good at reporting their power usage, but aside from processors and sometimes graphics cards, power usage is easily found. What is the power consumed by the Blu-ray / DVD drives? By the HDDs/SSDs? By the Mobo? etc. Why are these questions not easily answered when building a machine?

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• Windows - CPU power management APIs

  - by iulianchira

  What APIs are provided by Windows for CPU power management (I'm interested in CPU frequency scaling, setting min and max CPU frequency - similar to what you can do in Control Panel in power plans, but in a programmatic way). I'm also interested in .Net APIs.

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• Reason behind system power usage?

  - by kumar

  Hi, when the number of applications running in a pc increases, the power consumed by the PC is also increasing. Is this correct? I think the reason behind this is CPU. Please let me know what role the CPU plays for more power usage. Thanks, Kavi

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• New training on Power Pivot with recorded video courses

  - by Marco Russo (SQLBI)

  I and Alberto Ferrari started delivering training on Power Pivot in 2010, initially in classrooms and then also online. We also recorded videos for Project Botticelli, where you can find content about Microsoft tools and services for Business Intelligence. In the last months, we produced a recorded video course for people that want to learn Power Pivot without attending a scheduled course. We split the entire Power Pivot course training in three editions, offering at a lower price the more introductive modules: Beginner: introduces Power Pivot to any user who knows Excel and want to create reports with more complex and large data structures than a single table. Intermediate: improves skills on Power Pivot for Excel, introducing the DAX language and important features such as CALCULATE and Time Intelligence functions. Advanced: includes a depth coverage of the DAX language, which is required for writing complex calculations, and other advanced features of both Excel and Power Pivot. There are also two bundles, that includes two or three editions at a lower price. Most important, we have a special 40% launch discount on all published video courses using the coupon SQLBI-FRNDS-14 valid until August 31, 2014. Just follow the link to see a more complete description of the editions available and their discounted prices. Regular prices start at $29, which means that you can start a training with less than $18 using the special promotion. P.S.: we recently launched a new responsive version of the SQLBI web site, and now we also have a page dedicated to all videos available about our sessions in conferences around the world. You can find more than 30 hours of free videos here: http://www.sqlbi.com/tv.

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• disk write cache buffer and separate power supply

  - by HugoRune

  Windows has a setting to turn off the write-cache buffer (see image) Turn off Windows write-cache buffer flushing on the device To prevent data loss, do not select this check box unless the device has a separate power supply that allows the device to flush its buffer in case of power failure. Is it feasible and economical to get such a "separate power supply" for the internal sata drives of a non-server PC? Under what name is such a power supply sold? I know that there are UPS devices that can be connected to external drives,but what is required to be able to switch this setting safely on for an internal disk? The setting has different descriptions in different version of windows Windows XP: Enable write caching on the disk This setting enables write caching in Windows to improve disk performance, but a power outage or equipment failure might result in data loss or corruption. Windows Server 2003: Enable write caching on the disk Recommended only for disks with a backup power supply. This setting further improves disk performance, but it also increases the risk of data loss if the disk loses power. Windows Vista: Enable advanced performance Recommended only for disks with a backup power supply. This setting further improves disk performance, but it also increases the risk of data loss if the disk loses power. Windows 7 and 8: Turn off Windows write-cache buffer flushing on the device To prevent data loss, do not select this check box unless the device has a separate power supply that allows the device to flush its buffer in case of power failure. This article by Raymond Chen has some more detailed information about what the setting does.

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• How reliable is the battery data in ubuntu the power statistics?

  - by nbubis

  Right now the power statistics show that: Energy when full: 25.5 Wh Energy (design): 93.2 Wh And indeed the battery doesn't seem to be lasting as long as it used too. My question: Is this data reliable? Does it really indicate that I should replace the battery, or could it be the charger, laptop, or OS that is stopping the battery from fully charging? Is any way of validating the battery is indeed to blame? I'd like to be sure before shelling out 90$ for a new battery. (If it helps, the battery is a 3 year old dell 9 cell rated at 90 Wh).

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• Should laptops remain plugged in when their battery is 100% charged?

  - by Click Upvote

  I've been hearing mixed responses to this, so would like to hear the final answer. When your laptop's battery is 100% charged, should you leave it plugged in so any battery power doesn't get used, or will that cause overcharging, overheating. etc? Should the laptop be unplugged when battery is 100%? I'm asking because my laptop's screen tends to get dim when unplugged, so I don't like to run it on battery. (Any fixes to this would also be helpful.)

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• What Exactly Does the Wattage Rating on a Power Supply Unit Mean?

  - by Jason Fitzpatrick

  Your PSU is rated 80 Plus Bronze and for 650 watts, but what exactly does that mean? Read on to see how wattage and power efficiency ratings translate to real world use. Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. How To Use USB Drives With the Nexus 7 and Other Android Devices Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder? Why Your Android Phone Isn’t Getting Operating System Updates and What You Can Do About It

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• What is the reason for high power consumption in 12.04?

  - by tom

  I haven't seen this exact question posted or any related answers, so I'm re-posting. Here is the problem: After upgrading to Ubuntu 12.04 Precise Pangolin, my t420s laptop idles above 20 watts (right now with only Chrome running, I'm using 25.4 W) I had a similar problem with Ubuntu 11.10, but after much tweaking the power consumption came down < 10 W on idle. The primary culprit to the 11.10 problem was supposedly fixed by default in 12.04. So my question is, what is happening now? Computer: Lenovo Thinkpad t420s, with Intel i5-2520M @2.5 Ghz - 2x 4gb ram - disk 0 HITACHI 320 Gb - disk 1 SATA SSD 128 Gb

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• What is the minimum power supply wattage needed for a Pentium 2.4GHz system?

  - by scottmarlowe

  It looks like I've got a dead Antec True 330 power supply in an older desktop that has an Intel D845PESV motherboard, a Pentium 2.4GHz processor, 2 dvd/cd writers, 2 hard drives, and other typical devices. I have an even older computer that is not being used that has a 200W power supply. Can a 200W power supply drive what I've listed above? Or, put another way, what is the minimum power supply specs for the above system? (A new 350W power supply will run me $30--so buying a new one is not a problem--but I'm curious about the question nonetheless).

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• How do I make my Geforce GTS 250's power save mode stop causing audio stuttering?

  - by Matt

  Whenever my GTS 250 enters its power save mode, downscaling its frequencies, my audio stutters. This affects both my onboard audio and my Audigy Soundblaster 2 ZS. Changing Windows power save mode options such as PCI-E link state power management or Power Management Mode in the nVidia control panel have no effect on this issue. Replacing the power supply had no effect on this issue. The BIOS is the latest version, and I have the latest motherboard chipset and graphics drivers installed. I do not overclock. I started to see this issue after I upgraded my rig from its Socket 939 board to a Socket 1156 board with a Core i5-750 while simultaneously upgrading from Vista to 7.

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• How do you make the computer locked when the monitor is turned off but power not off in Windows Vista?

  - by Anon

  I have a power management setting (set up through the Control Panel) that turns the monitor off after 5 minutes of idling but keeps the power on all time, if the laptop is connected to power. Under this setting, however, the computer doesn't lock itself and becomes vulnerable to any passerby's attempt to log in if I'm not around. Is there any way to force lock in this situation? (I can force lock if I have the laptop go sleep, but for immediate access I'd like to keep the power on when the laptop is connected to power.)

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• What happens with the Guest OS's on ESXi in the event of a power failure?

  - by Jeremy Holovacs

  Many small businesses would prefer to let their server drop on power failure than to pay even $100 for a cheap UPS. It's often difficult to convince them of the value of something like that; it's why they like ESXi. It's free, they can save a lot of cash by putting a bunch of linux servers on one machine, and then I get paid. :) If the ESXi server experiences a power outage, it is set to come back on automatically when power is restored. What happens with the guest OS's? Ideally I would like them to all come online again as well, assuming they were on when power was lost, but I see no option for choosing this. I don't want to yank power to the system just to try it out, of course. I'm sure someone knows what happens by default, and perhaps how to make my system to work as I would wish.

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• Power Analysis in [R] for Two-Way Anova

  - by Thomas

  I am trying to calculate the necessary sample size for a 2x2 factorial design. I have two questions. 1) I am using the package pwr and the one way anova function to calculate the necessary sample size using the following code pwr.anova.test(k = , n = , f = , sig.level = , power = ) However, I would like to look at two way anova, since this is more efficient at estimating group means than one way anova. There is no two-way anova function that I could find. Is there a package or routine in [R] to do this? 2) Moreover, am I safe in assuming that since I am using a one-way anova power calculations, that the sample size will be more conservative (i.e. larger)?

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