so no updated kext or something? im on a laptop dell xps
It is unlikely GenericUSBXHCI.kext will be updated. No developer cares enough about old hardware that has non-Intel USB3.
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System: manufacturer/model + bootloader(Clover/Chameleon/Chimera)
CPU: detailed CPU model + motherboard chipset
Graphics: all graphics devices + laptop internal screen resolution
For example, typical Ivy laptop:
Mobo: HP ProBook 4540s (Clover)
CPU: i5-3320m/HM76
Graphics: HD4000, 1366x768
Use CPU-Z on Windows to find CPU (Core iX-xxx) and motherboard chipset (HMxx), and graphics capabilities. For a laptop, these details are important and affect critical installation procedures.
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Also, provide output from 'lspci -nn' in Linux Terminal.