# LimeSDR shows USB 2.O

**URL:** <https://discourse.myriadrf.org/t/limesdr-shows-usb-2-o/6006>\
**Category:** LimeSDR\
**Created:** [21 April 2020 20:16 UTC](https://discourse.myriadrf.org/t/limesdr-shows-usb-2-o/6006 "2020-04-21T20:16:08Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![kwadwobrainy](https://avatars.discourse-cdn.com/v4/letter/k/df788c/32.png) [@kwadwobrainy](https://discourse.myriadrf.org/u/kwadwobrainy)\
**Post date:** [21 April 2020 20:16 UTC](https://discourse.myriadrf.org/t/limesdr-shows-usb-2-o/6006/1 "2020-04-21T20:16:08Z")

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Dear All,

i have a lime SDR connected to a USB 3.0 port but it shows 2.0. how can i fix this? thanks

- [LimeSDR-USB, media=USB 2.0, module=FX3, addr=1d50:6108, serial=00090726074F3626]

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**Author:** ![N0YKG](https://avatars.discourse-cdn.com/v4/letter/n/3bc359/32.png) [@N0YKG](https://discourse.myriadrf.org/u/N0YKG)\
**Post date:** [22 April 2020 11:37 UTC](https://discourse.myriadrf.org/t/limesdr-shows-usb-2-o/6006/2 "2020-04-22T11:37:56Z")

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First, check your cables - a lot of the so-called “USB 3” cables either don’t have the extra conductors for USB3, or they are such crappy cables that they have wires, but the wires are not up to carrying the extremely high frequency signals USB3 uses.  
Second, check that your port really is USB3. I am sure you’ve done so many times, but… “Is it plugged in? Is it turned on? Is there power?”

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**Author:** ![kwadwobrainy](https://avatars.discourse-cdn.com/v4/letter/k/df788c/32.png) [@kwadwobrainy](https://discourse.myriadrf.org/u/kwadwobrainy)\
**Post date:** [22 April 2020 22:04 UTC](https://discourse.myriadrf.org/t/limesdr-shows-usb-2-o/6006/3 "2020-04-22T22:04:58Z")

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Thanks…  
I will change the cable and get back to you.

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**Author:** ![kwadwobrainy](https://avatars.discourse-cdn.com/v4/letter/k/df788c/32.png) [@kwadwobrainy](https://discourse.myriadrf.org/u/kwadwobrainy)\
**Post date:** [23 April 2020 13:36 UTC](https://discourse.myriadrf.org/t/limesdr-shows-usb-2-o/6006/4 "2020-04-23T13:36:54Z")

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Hi…  
I have a working USB 3.0 cable connected but it still shows USB 2.0  
[LimeSDR-USB, media=USB 2.0, module=FX3, addr=1d50:6108, serial=00090726074F3626]  
When i run LimeUtil --update comnand. Kindly assist.

Regards

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**Author:** ![kwadwobrainy](https://avatars.discourse-cdn.com/v4/letter/k/df788c/32.png) [@kwadwobrainy](https://discourse.myriadrf.org/u/kwadwobrainy)\
**Post date:** [23 April 2020 21:11 UTC](https://discourse.myriadrf.org/t/limesdr-shows-usb-2-o/6006/5 "2020-04-23T21:11:41Z")

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Hello All,  
i kindly need assistance:  
I think there might be something wrong with the SDR. i have connected a limeSDR to ubunru 16.04 OS.  
It doesn’t show up when connected with USB 3.0 cable as per below:

/: Bus 02.Port 1: Dev 1, Class=root\_hub, Driver=xhci\_hcd/8p, 5000M

/: Bus 01.Port 1: Dev 1, Class=root\_hub, Driver=xhci\_hcd/16p, 480M

```
|__ Port 3: Dev 2, If 0, Class=Hub, Driver=hub/4p, 12M

    |__ Port 1: Dev 4, If 2, Class=Human Interface Device, Driver=usbhid, 12M

    |__ Port 1: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 12M

|__ Port 9: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M

|__ Port 9: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M

```

It only shows up when I have a USB 2.0 cable connected as highlited below:

/: Bus 02.Port 1: Dev 1, Class=root\_hub, Driver=xhci\_hcd/8p, 5000M

/: Bus 01.Port 1: Dev 1, Class=root\_hub, Driver=xhci\_hcd/16p, 480M

**|\_\_ Port 2: Dev 13, If 0, Class=Vendor Specific Class, Driver=, 480M**

```
|__ Port 3: Dev 2, If 0, Class=Hub, Driver=hub/4p, 12M

    |__ Port 1: Dev 4, If 2, Class=Human Interface Device, Driver=usbhid, 12M

    |__ Port 1: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 12M

|__ Port 9: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M

|__ Port 9: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M

```

I have tested the USB 3.0 extension cable with other devices and it works ok.

/: Bus 02.Port 1: Dev 1, Class=root\_hub, Driver=xhci\_hcd/8p, 5000M

**|\_\_ Port 1: Dev 4, If 0, Class=Mass Storage, Driver=uas, 5000M**

/: Bus 01.Port 1: Dev 1, Class=root\_hub, Driver=xhci\_hcd/16p, 480M

```
|__ Port 2: Dev 13, If 0, Class=Vendor Specific Class, Driver=, 480M

|__ Port 3: Dev 2, If 0, Class=Hub, Driver=hub/4p, 12M

    |__ Port 1: Dev 4, If 2, Class=Human Interface Device, Driver=usbhid, 12M

    |__ Port 1: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 12M

|__ Port 9: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M

|__ Port 9: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M
```

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**Author:** ![andrewback](https://avatars.discourse-cdn.com/v4/letter/a/22d042/32.png) [@andrewback](https://discourse.myriadrf.org/u/andrewback)\
**Post date:** [26 April 2020 08:50 UTC](https://discourse.myriadrf.org/t/limesdr-shows-usb-2-o/6006/6 "2020-04-26T08:50:11Z")

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Some motherboard USB chipsets can be problematic and would suggest tying another computer also if possible.

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**Author:** ![sdrpower2](https://avatars.discourse-cdn.com/v4/letter/s/9dc877/32.png) [@sdrpower2](https://discourse.myriadrf.org/u/sdrpower2)\
**Post date:** [27 April 2020 01:36 UTC](https://discourse.myriadrf.org/t/limesdr-shows-usb-2-o/6006/7 "2020-04-27T01:36:05Z")

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Check that usb3.0 pins of your lime are not broken. this was the explanation for me (already two lime in this situaion)

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**Author:** ![kwadwobrainy](https://avatars.discourse-cdn.com/v4/letter/k/df788c/32.png) [@kwadwobrainy](https://discourse.myriadrf.org/u/kwadwobrainy)\
**Post date:** [27 April 2020 16:22 UTC](https://discourse.myriadrf.org/t/limesdr-shows-usb-2-o/6006/8 "2020-04-27T16:22:40Z")

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thanks. please how much power does the limeSDR need to be stable. my usb ports are only giving 100mA