Author Topic: USB power/device disconnects.  (Read 1781 times)

Dr_Quake

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USB power/device disconnects.
« on: March 05, 2014, 12:47:06 pm »
On every board i have(every of current line - v1,v2,truck) there is some problems with 3G dongles, with every dongle i tested - random disconnects with this kernel message:

USB port x disabled by hub (EMI?), re-enabling

And sure connection lost with device.

After some investigations , i've found that dongles draws 650ma at peak, but even with single 3G dongle connected and completely no other devices that requires power , it's still fails with disconnects, therefore not so often. Even with 3A power to cubie, even with 5.2 volts vs 5 standart.

So, there is no solution except getting USB Hub with huge own power supply and connecting devices to it - problem disappeared. Its really bad news for those, who want portable device, but it is.