19 Feb
2017
19 Feb
'17
8:25 p.m.
On Sun, 19 Feb 2017 19:28:57 +0100, Clemens Ladisch wrote:
Ralf Mardorf wrote:
That was my first thought, since for the old mobo ohci was shown by
lsmod, but to my surprise it isn't for the new mobo. However, this
doesn't explain why the ports are still working for the new mobo, it
becomes just more unclear.
[rocketmouse@archlinux ~]$ lsmod | grep -i hci
xhci_pci 16384 0
xhci_hcd 192512 1 xhci_pci
ahci 36864 5
libahci 32768 1 ahci
libata 253952 2 ahci,libahci
ehci_pci 16384 0
ehci_hcd 77824 1 ehci_pci
usbcore 249856 5
usbhid,ehci_hcd,xhci_pci,xhci_hcd,ehci_pci
I wonder if there's a way to see at what speed the USB ports are
working?
If I try to check with an external USB drive, it unfortunately shows
irrelevant SATA speed.
$ sudo smartctl -i /dev/sdc | grep SATA
SATA Version is: SATA 3.0, 6.0 Gb/s (current: 1.5 Gb/s)
Regards,
Ralf
If I unbind the ehci device that shares the IRQ
with audio cards,
still all 10 available USB ports work
Could somebody explain what this does mean?
EHCI controllers handle _only_ high-speed (USB 2.0) connections; full-
and low-speed connections require a separate controller (OHCI or UHCI).
You probably have a bunch of those.
If I unbound ports on my old mobo, they stopped
working.
Some chipsets have EHCI controllers with a built-in hub that handles
full-/low-speed connections, so for the OS, all connections end up at
the EHCI controller.