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• Is an Ethernet point to point connection without a switch real time capable?

  - by funksoulbrother

  In automation and control, it is commonly stated that ethernet can't be used as a bus because it is not real time capable due to packet collisions. If important control packets collide, they often can't keep the hard real time conditions needed for control. But what if I have a single point to point connection with Ethernet, no switch in between? To be more precise, I have an FPGA board with a giga-Ethernet port that is connected directly to my control PC. I think the benefits of giga Ethernet over CAN or USB for a p2p connection are huge, especially for high sampling rates and lots of data generation on the FPGA board. Am I correct that with a point to point connection there can't be any packet collisions and therefore a real time environment is given even with ethernet? Thanks in advance! ~fsb

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• Can I mix CAT5 and CAT6?

  - by Jason94

  I'm thinking of upgrading the "backbone" of my network, taking a CAT6 cable from my router (DLINK DIR-655 (has cat6 ports)) to a gigabit swith in the tv rom (25m). I have two devices there that uses network (xbox and tvbox, both of them have cat5). Will my net be downgraded to 100mbit as max speed, or will I get 1 gigabit between my router and switch, and 100mbit between tvbox and xbox? From back in the days i have a tool to create my cat5 cable (the plug tool thingy), can I use this for my cat6 too?

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• gnome-power-manager is running while trying to log in. How to get rid of it?

  - by koushik

  After booting into the ubuntu login screen and clicking on my user name and entering the password, I get a dialog stating that gnome-power-manager is still running. The dialog presents 2 buttons, 1 to Cancel and other to Logout Anyway. This issue happens about 50% of the time and I don't remember doing anything related to power management recently. Also, even if I don't choose any option in the dialog it goes away after about 30s. This is happening on a desktop machine as well as a laptop. On the laptop I have configured power management for myself (not for gdm) whereas in desktop I have not configured power management for any user. This is only an annoyance but still I would like to fix it, especially on my desktop where I am interested in getting it auto-login ASAP into my userid. Any ideas why this could be happenning?

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• Windows 7 power management in Boot Camp mode

  - by qntmfred

  I have a Macbook Pro with Windows 7 installed in Boot Camp. I have serious problems with the power management and not sure why. I have the default Balanced power plan selected. Many times when I close the laptop and leave it for more than just a few minutes, when I open it back up, it does not awake immediately. I end up having to press the power button to get it to wake up. Sometimes this causes it to wake up in Windows mode, sometimes it reboots completely, sometimes the battery has been drained and Windows has to restart. Is this a common problem? Can I fix it?

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• What is the best position for power unit?

  - by guest86

  I would like to buy new computer case. Last time I bought a computer was in 2008 and many things have changed up to day. Many new computer cases have power unit placed down, on bottom. I'm thinking about buying some of those cases, but i'm not sure about something - if power unit is placed on the bottom it can't take away hot air from the case and pump it out right? All my PC parts are silent - CPU (E8200, placed below 12cm Nochtua fan of power unit) has heat-pipe cooler with Nochtua fan spinning at only 800rpms, GPU has cooler powered by 7V instead 12 and that's why i don't want to HAVE TO place another fan to pump out hot air instead of PU placed on top. That might make some noise. So i ask someone more experienced: if i buy some computer case with PU placed down, do i HAVE TO place some fan to pump out hot air?

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• Windows 7 USB power lose after a few seconds / minutes

  - by Stefan Dunn

  My friend's computer has a problem where the USB ports causes problems with the power of some devices connected to the computer. The USB mouse has no problems, however the Wireless Adapter looses power after around 20 seconds of use and USB Flash Drives cause the computer to either freeze, lose power (and become unresponsive) or become disconnected (still shown in Device Manager, but not in My Computer) when trying to transfer any type of file to / from the computer. I have a suspicion it's the Motherboard but could it also be a Software problem? Tried a new case, RAM, CPU and GFX Card which had no effect. The problem occurs on both the Front USB and Back (Motherboard) USB Ports. UPDATE: Tried the USB devices with an Ubuntu Live CD and they work fine, could this mean it's a problem with Windows (x64)?

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• Connecting mother board, power supply, and tower

  - by JordanD

  I am working on putting together a desktop for the first time and and ran into a problem, I am not sure how to connect the fans that came in my tower, my power supply, and connect them all to the mother board. Tower Mobo Power Supply There are 3 fans in the tower, each have 3 pin male and female connector that come connected, and 4 pin (larger?) male and female connector which are hanging. How would I go about connecting The fans together then to the power supply and mobo so it is easiest control (or suggest me a smart / better option). Pictures are from fans on HAF 922 Tower. Thanks

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• How to disable power to USB ports when laptop is in sleep mode

  - by Greg

  I have a Windows7 laptop with two external 2.5" HDDs and a cooling pad connected through USB ports. When I put the laptop to sleep, these devices are still powered on - the fan in the cooling pad is still spinning, the drives are still spinning. I want to set it all up so that they power down when in sleep. I tried setting the Allow the computer to turn off this device to save power option in the USB Root Hubs' Properties in Device Manager and enabling USB selective suspend in power options - it didn't work. As it's a laptop, BIOS options are extremely locked down, so I can't even see anything relevant to sleep in there. Is it even possible to do this?

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• Computer randomly shuts down with a fading alarm power button and CD drive

  - by Shad

  I am currently experiencing something very very odd. Having build my PC myself, I have never had any issues (or anything heat related). A few moments ago my computer shut down very randomly and everything goes blank, when I looked down on my case's power button it was fading on and off in such way I've had never seen before. I noticed the CD drive all of a sudden also started blinking randomly. What do you guys think this problem is related to? It is definitely not a overheating issue and I am pretty sure my 600 watt power supply didn't blow because right now I am able to turn it on and boot up the PC but 20 seconds later it shuts down (sometimes doesn't shut down for 2 minutes). I have no idea what this is... My specs are (built by myself): i5 3570k (unoverclocked) GTX 560ti Asrock Z77 Pro4-M motherboard 8GB Vengeance RAM 600W Corsair power supply 500GB of Seagate HD Case: Corsair Carbide 300R

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• Is the 4-pin PSU connector required? (Trying to connect a PSU to a mini case.)

  - by Geeks On Hugs

  I am trying to build a computer, placing an ASUS P8H67-I DELUXE in a custom retro C64 case. The case is an extra small form factor which can accomodate the Mini ITX board, but requires an external power supply, similar to the power-bricks that laptops use. I am looking at different power supplies and like these, but cannot figure out whether/how to power this system because they provide a 24-pin connector, but the motherboard has a 4-pin connector as well. Is the 4-pin connector optional or is it required? If it is required, how can I provide power for this system?

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• Dell Latitude E6400 power button and wireless not working or only working intermittently

  - by Droid

  The power button on the laptop stopped working randomly as of a day or two ago. I can only power the laptop on if its attached to a docking station, on which I can use the power button to turn on/off the laptop. Today the wireless card stopped working (the wifi light does not turn on, even after I turn on the wireless switch). What is the problem and how can I fix it? The laptop is about 1 year old. I have not dropped it, but do carry it around a good amount, including docking it/undocking it frequently.

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• PC doesn't power up anymore

  - by Andrew

  I will tell you the story behind the problem. The computer needed to be reinstalled, it has 2 HDDs so I had to un-plug one to see which is which, to save as much data as possible. After unplugging the first one, it booted with the reinstallation CD, it wasn't the HDD I was looking for so I turned it off and unplugged the other one. After unplugging and turning on, right after booting test, the HDD was turned off, only the CPU fan was working. Turned it off with the power supply's button help, holding the power button didn't do it. And now it doesn't want to turn on anymore. I tried with another test power supply but the result is the same, doesn't want to turn on. Any idea?

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• Computer has power but won't boot

  - by John Isaacks

  When I power on my computer it will not boot. It will not even go into bios or anything. It is as if it is not powering on at all, however the decorative casing lights turn on and the PC is making noise (like from the fans). I am reluctant to think it is the power supply since some part are getting power. I do not know what it is though? For the couple days leading up to this, the computer would make a loud noise and the screen would stop displaying anything. I had to reboot to get it to work again. Now nothing happens when I boot, except the case lights come on and it sounds like some fans are coming on. Any ideas?

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• Power states in Windows

  - by Kurt

  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 default states S1-S3 are disabled in Vista and later (they can be enabled by a group policy). Can Windows cycle through these states while for instance an application is actively running?

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• Intel atom and overall power consumption

  - by amorfis

  I am considering buying of Intel Atom machine. Power consumption is one of my concerns (it is for small server). I know CPU itself consumes a little power, but I heard that chipset consumes much more. Anybody knows how much can such machine consume? I am considering Intel MoBo BLKD945GCLF (chipset: Intel® 945GC Express Chipset with ICH7)

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• External hard drive that gets its power supply from the PC.

  - by AngryHacker

  I need an external drive to connect to my MacMini. I've been using an 80gb 2.5 drive in an enclosure and it's fine, but now I need a 1.5TB drive. Unfortunately all the 1.5TB drives I found need a separate power supply. I'd like it to be able to feed its power off the USB drive (just like my 80gb drive does). Does something like that exists?

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• Power and Cooling Cost compared with Server/Hardware Cost

  - by psaccounts

  Has anyone done, or is aware of any, calculations to compare the cost of power and cooling compared to the cost of hardware (servers) in a typical data center? This is to compute a true total cost of ownership of self-hosting servers. Of course real TCO includes: hardware_cost + power + cooling + rental + human_cost + maintenance Is there any study that says something like (TCO - hardware_cost) = 40% of hardware_cost in 3 years? Any pointers will be appreciated.

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• Cannot find Power Management Tab in XP

  - by Andrew Heath

  I have the problem that when I send my computer to sleep it wakes if you bump the table, floor, burp etc. I have read many threads that say go to Device Manager Mouse Properties Power Management Tab and uncheck the box for wake. My problem is I do not have a Power Management Tab! Anyone know how to enable the tab or stop the mouse from waking my machine? And no, turning it upside down doesn't work either!

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• No power to HP pavilion dv 1000

  - by Imajica666

  I am working on a friends laptop. I get no power indicator light while plugged in to ac outlet. Will not power on with just the battery. Might this be a case of replacing the system board? I have never broken open a laptop so I am not sure what the best path to take might be. Thanks for any opinions.

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• My PC re-start when power comes back after a sudden power faliure.

  - by Papai

  I have run a iverter APC 800va in the main line with a battery exite tubler IT 500. Then a 600 VA UPS before the power to CPU. Now when the power goes there is no problem at all but when the amin supply come back then the problem ocures most of the time my PC re-start. Please help.

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• How to permanently save power options in windows 7

  - by Ieyasu Sawada

  How can I set the hard disk to never turn off permanently?And the sleep to never, together with the hibernate. Because the options resets to their default values when I turn off, log off or restart my computer. I am using granola on my laptop and it is set to lowest speed. When I restart it turns to full power again. Does it have something to do with the power options resetting to their default values?

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• Raid 5 and Power Supply damage?

  - by Tronic

  Hi. Because I build a RAID 5 atm, I wanted to ask, what would happen if the server with a raid 5 in it (like 4-5 hdds) would have a power supply damage? Can I just switch the power supply and my data is safe and backup again or will there be a raid damage as well? Thanks in advance. Regards.

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• Power on from standby with wireless keyboard

  - by ULTRA_POROV

  S3 standby state. Set power-on by usb device in bios. Enabled standby power-on in device manager on the keyboard. No effect. Any ideas? Is it possible?

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• Power supply for HP Workstation xw4100

  - by Nathan Adams

  Does anyone know if the HP Workstation xw4100 takes a "special" power supply? I know there was a time when everyone was using their own PSs with different pinouts, but I was under the impression that enough people complained and all the companies switched to standard power supplies.

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• MB with CPU and power supply - can be turned on but not off

  - by COcodrilo

  Hi, Not sure whether this question belongs here, I hope so. I have just bought a motherboard and CPU. I have installed the CPU, cooler and connected to CPUFAN on the MB. I have plugged the power supply to MB and the cable from "ON" button to pins named "PWR" and the LEDs. However when I turn on the PC, both HDD and POWER leds are continously on and the PC cannot be turned out. What could I be missing?

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