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USB-Hub buggy if more than one device connected

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My USB-Hub is very buggy when more than one device is connected. on a fully updated Ubuntu 23.04. On Windows 11 (dual boot) everything works fine, so a hardware issue can be ruled out. When multiple devices are connected to the 6-port hub, the connection isn't reliable anymore. Connected bluethooth-devices loose contact for a few seconds each minute and disk-processes like copying stop half-way through.

I currently don't know where to start and sadly cant provide a hub model. But from lsusb I know that the USB controller is a RTS5411.

lsubs:

Bus 005 Device 006: ID 0bda:0411 Realtek Semiconductor Corp. Hub
Bus 005 Device 005: ID 0bda:0411 Realtek Semiconductor Corp. Hub
Bus 002 Device 006: ID 0bda:5411 Realtek Semiconductor Corp. RTS5411 Hub
Bus 002 Device 005: ID 0bda:5411 Realtek Semiconductor Corp. RTS5411 Hub

I can't provide any more debug info because I don't know where to start.

I sit in a Tesla and translated this thread with Ai:

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