Windows 8 and 8.1 Forums


Wireless receivers and underpowered USB ports?

  1. #1


    Posts : 3
    Windows 8.1

    Wireless receivers and underpowered USB ports?


    I have a new PC that a friend built for me, I've noticed that the wireless receivers for my keyboard, mouse and wifi aren't working properly when plugged into any USB ports (front or back, 2.0 or 3.0). The range for the keyboard/mouse is awful and wifi connection is very slow if it connects at all.

    However, all peripherals work correctly when plugged into a powered USB hub, the range for keyboard/mouse is huge and internet/download speed is fantastic.

    Everything is up to date and was installed correctly. Having a couple of forums and speaking to Asus, I think it's a power issue. I arranged an RMA but the problem persists with the new motherboard.

    I'd be grateful for any help, but being new to this detailed suggestions/instructions might be necessary. Thanks.

    Mouse - Microsoft Wireless Mouse 4000
    Keyboard - Logitich K400R
    Wifi - Edimax EW-7811UN

    OS - Windows 8.1
    Case - Bitfenix Prodigy-M
    PSU - Corsair CX500
    Mobo - Asus H81M-Plus
    CPU - Intel Core i5-4440 3.10GHz
    RAM - Corsair Vengeance 8GB (2x4) DDR3 1600
    HDD - Seagate Barracuda 1TB
    GPU - MSI R6850

      My System SpecsSystem Spec

  2. #2


    USB2 can give up to 500mW and USB3 up to 900mW, I don't think that WiFi adapter draws that much but did you check it's power requirement ?
    Also, in BIOS, are USB ports set to "Legacy" ?
      My System SpecsSystem Spec

  3. #3


    Posts : 3
    Windows 8.1


    Checked the BIOS and USB Legacy is enabled. Can't actually find the power requirements anywhere, but three USB receivers can't be drawing very much at all surely?
      My System SpecsSystem Spec

  4. #4


    Quote Originally Posted by neale1991 View Post
    Checked the BIOS and USB Legacy is enabled. Can't actually find the power requirements anywhere, but three USB receivers can't be drawing very much at all surely?
    Those values in mW are "Per port" so each port can draw that much. If you don't stick them all together in one un-powered splitter in one USB port, there should be no trouble. Did you try them one by one ? There may not be a problem with power but if they are all WiFi or even mix with Bluetooth, there may be some cross-channeling because they all work on same 2.4 GHz frequency.
      My System SpecsSystem Spec

  5. #5


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    It's milliamps not milliwatts by the way. USB 2.0 ports are 5 Volts and up to 500 ma of current. 500 ma is half an amp. I doubt that your adapters are drawing anything close to that. If you open Device Manager and open the properties for a each of your USB Root Hubs, you can see how much current is being drawn under the power TAB.

    I have an ASUS M4N68 and M2N68 motherboard. My laptop is an ASUS K75DE. I run Logitech Unifying receivers on all of them with no issues. The two desktops have wireless Logitech keyboards. A desktop and my Laptop have a wireless M570 track ball. My laptop is showing a 98ma draw on the USB Hub.
      My System SpecsSystem Spec

  6. #6


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    I'd open up your case and confirm all the power connectors on the motherboard have the required power supply cables connected. 500 Watt is the minimum recommended power supply and that's what you have. I'm not sure if that's an issue or not, depends on what other hardware is installed. If you had two video cards it would be.
      My System SpecsSystem Spec

  7. #7


    Quote Originally Posted by alphanumeric View Post
    It's milliamps not milliwatts by the way. USB 2.0 ports are 5 Volts and up to 500 ma of current. 500 ma is half an amp. I doubt that your adapters are drawing anything close to that. If you open Device Manager and open the properties for a each of your USB Root Hubs, you can see how much current is being drawn under the power TAB.

    I have an ASUS M4N68 and M2N68 motherboard. My laptop is an ASUS K75DE. I run Logitech Unifying receivers on all of them with no issues. The two desktops have wireless Logitech keyboards. A desktop and my Laptop have a wireless M570 track ball. My laptop is showing a 98ma draw on the USB Hub.
    Yeah right, mA it is.
      My System SpecsSystem Spec

  8. #8


    Posts : 3
    Windows 8.1


    Tried the devices one by one, no difference. Also checked the 4 Root Hubs in Device Manager (two of them didn't have a power tab, am I looking at the wrong bit). They say 500mA available and 0mA required. I'll take a look inside the case but i'm fairly certain everything's connected up right, to my limited knowledge anyway.

    Apologies if I am being stupid and looking in the wrong places, i'm VERY new to this, however you're both already more help than anywhere else I've tried so thank you.
      My System SpecsSystem Spec

  9. #9


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    One of mine didn't have a Power TAB, I'm not sure why though? It had an (xHCI) after it. It might be my USB 3.0 ports. It may be due to the manufacturer/drivers. One of my other two showed 500mA available and 0mA required. The other one showed 500mA available and 98mA required. < this is my Unifying receiver. Now I'm confused, I have 3 USB Root Hubs listed but I only have 2 USB 2 ports and 2 USB 3 ports?
      My System SpecsSystem Spec

  10. #10


    Quote Originally Posted by alphanumeric View Post
    One of mine didn't have a Power TAB, I'm not sure why though? It had an (xHCI) after it. It might be my USB 3.0 ports. It may be due to the manufacturer/drivers. One of my other two showed 500mA available and 0mA required. The other one showed 500mA available and 98mA required. < this is my Unifying receiver. Now I'm confused, I have 3 USB Root Hubs listed but I only have 2 USB 2 ports and 2 USB 3 ports?
    Only ones that have something connected to the ports should show "Required" value. As far as number of ports are concerned, you may have only so many physical USB connectors but control chip may have provision for more. Some devices could also be connected internally to USB ports, like internal camera for instance. Similar thing is with PCI/PCI express internal connections, there are internal buses and other ones that you can actually plug something in. Internal PCI/ex. buses connect SB and SATA conntrollers.
      My System SpecsSystem Spec

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