• viper
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Topic: UFX+ blue blinking host LED with USB3 sharing switch

Hello,

I have a setup where I need to intermittently use a Fireface UFX+ (latest FW) on two computers (Windows 11, latest RME drivers).
As both machines are located at different places, a full KVM switch is not required and I got an Ugreen CM662 USB3.0 sharing switch with only the UFX+ (and optionally power supply) connected to it.

But the UFX+ is not recognized by any computer connected to the switch and the host LED is blinking/flashing blue.
Changing cables did not do the trick.
However, when using a USB 2.0 cable, the host LED is steady orange and the device works without required MADI (as expected in USB2 mode).

I first blamed the USB sharing switch, but: a MadifaceXT is working in USB3 mode without any issues. So, I suspect that it is not (only) an issue of the Ugreen USB switch.

Could it be a UFX+ HW issue? Or is is USB3 HW/FW very different between UFX+ and MadifaceXT, giving latter more robustness?
I had some reports about a blinking host LED from other people using the UFX+ (without the switch) once in a while, especially if not directly connected to the host, but via USB hub.


Thank you very much for any hints or information

2 Reply by vinark (edited by vinark 2026-05-06 13:49:33)

  • vinark
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Re: UFX+ blue blinking host LED with USB3 sharing switch

I remember that sometimes changing the usb mode of the UFX helps. So force it USB3 if on auto or the other way round. Of course might not help...

Vincent, Amsterdam
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  • viper
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Re: UFX+ blue blinking host LED with USB3 sharing switch

Thanks for the hint, but unfortunately it doesn't help.

  • Was set to auto before.

  • USB 3 mode still has blinking host LED and no connection.

  • USB 2 mode has working USB 2 connection.

  • From: Germany
  • Registered: 2007-04-10
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Re: UFX+ blue blinking host LED with USB3 sharing switch

But direct connection works fine?

Regards
Daniel Fuchs
RME

RME Support's Website

  • viper
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Re: UFX+ blue blinking host LED with USB3 sharing switch

But direct connection works fine?

Yes.
Somebody told me he once had a similar issue, but I could not reproduce it so far.

  • From: Utah, USA
  • Registered: 2020-10-08
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Re: UFX+ blue blinking host LED with USB3 sharing switch

How long is the total cable run?

I wonder if you could get it working with 2 shorter cables, or fiberoptic cables if you need the length. May even be that high quality cables in general could help.

That being said, it's generally not recommended to use a switch with RME USB interfaces.

MADI FX | Digiface Dante | Fireface UFX+

7 Reply by viper (edited by viper 2026-05-08 14:37:38)

  • viper
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Re: UFX+ blue blinking host LED with USB3 sharing switch

Ninbura wrote:

How long is the total cable run?

Cables were my first concern and I tested different short high quality cables (PC → 1m → switch → 1m → UFX+).


Ninbura wrote:

That being said, it's generally not recommended to use a switch with RME USB interfaces.

I can get that but it would have been so nice, especially as it is working flawlessly with the MadifaceXT even with longer cables (PC → 4m → switch → 2m) MadifaceXT.

  • From: Germany, Tuvalu, Poland, Chile
  • Registered: 2021-07-27
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Re: UFX+ blue blinking host LED with USB3 sharing switch

If I may share my experience...
I have an "cheap" Ugreen 2-to-4 USB3 port here too. Another model, but basically similar then your CM662.
Well, what I can say, this box is so bad soldered and far away from a professional kvm switch at all. Especially for audio stuff.
In fact, although ugreen advertises it as "SuperSpeed USB3" capable - it never worked with the UFX3 here.
Same with USB3 ssd drives - they have very slow R/W rates...
However, its usable with 802 (USB2), but only if NOT all 4 ports are used at same time...

So, @viper - putting 1 and 1 together, as you already said in #5: It works with direct connection...
The ugreen box itself is the culprit. Not any cables or sth else.
I would even bet: MadifaceXT will "fail" via this box too, if you feed all its 394 channels and use the full USB3 bandwidth...

“Do It For Her”
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  • viper
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Re: UFX+ blue blinking host LED with USB3 sharing switch

Hi maggie33,

thank you very much for sharing your experience.
I'll try to find a workaround solution.

Would you mind sharing the excact Ugreen model number you tested, if you can remenber?

  • From: Germany, Tuvalu, Poland, Chile
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Re: UFX+ blue blinking host LED with USB3 sharing switch

Ugreen 30768

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  • viper
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Re: UFX+ blue blinking host LED with USB3 sharing switch

Thanks a lot