On 12/8/23 01:55, fedora@xxxxxxxxxxxxxx wrote:
1) Using the C-C cables, speed 33.64 MB/sec
Dec 8 20:04:26 e7 kernel: usb 3-1: new high-speed USB device number 18
using xhci_hcd
This is USB 2.
Just because a cable has a USB-C connector on it doesn't indicate what
protocol it can handle.
2) Then connected to a USB3 port using a C-USB3 cable: speed 441.36 MB/sec
Dec 8 20:19:37 e7 kernel: usb 2-7: new SuperSpeed USB device number 19
using xhci_hcd
This is the max speed for USB 3.0.
Dec 8 20:19:37 e7 kernel: usb 2-7: Enable of device-initiated U1 failed.
Dec 8 20:19:37 e7 kernel: usb 2-7: Enable of device-initiated U2 failed.
Dec 8 20:19:37 e7 kernel: usb 2-7: Enable of device-initiated U1 failed.
Dec 8 20:19:37 e7 kernel: usb 2-7: Enable of device-initiated U2 failed.
This is probably a red herring. These are lower power states for the
device.
3) Finally, again C-C using a C->USB3 then USB3->C, speed 1006.17 MB/sec
Dec 8 20:28:22 e7 kernel: usb 4-1: new SuperSpeed USB device number 18
using xhci_hcd
Now you are getting the max speed for USB 3.1.
So you have different cables and it makes sense. You will have to
carefully pick your cables if you want the speeds.
--
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