USB keyboard not detected with dGPU with USB Type-C port

[Paul Menzel]

Dear SeaBIOS folks,


Do you have any ideas regarding the USB issues with a dedicated GPU 
device with integrated USB Type-C port plugged in [1]?


Kind regards,

Paul


[1]: https://ticket.coreboot.org/issues/414

[Peter Stuge]

Paul Menzel wrote:
> Do you have any ideas regarding the USB issues with a dedicated GPU 
> device with integrated USB Type-C port plugged in [1]?

Only speculation:

Maybe multiple xHCI controllers trip up the SeaBIOS xHCI driver?

Two tests would be useful, the latter can be performed by anyone:

1. Connect the keyboard to the graphics card USB port (try with and
without a hub)

2. On any mainboard with coreboot and SeaBIOS (maybe even qemu),
connect multiple xHCI host controllers (PCIe cards) and see what
the logs say.


Kind regards

//Peter