I have an Odroid XU4 with Ubuntu 15.10 installed (flashed from http://odroid.com/dokuwiki/doku.php?id=en:xu3_release_linux_ubuntu
When I use the USB3 ports, I get drop outs and slow speed. The syslog shows a lot of :
Mar 24 17:00:00 odroid kernel: [ 18.967657] [c6] xhci-hcd xhci-hcd.5.auto: xHCI xhci_drop_endpoint called with disabled ep ddd5fd80
Googling that error shows that others have seen the same issue with xhci, but I cannot see a fix, other than changing the setting XHCI mode in the BIOS from "Smart Auto" to "disabled." Ubuntu will then use EHCI, which works, but at USB2 speed, not USB3.
I have 2 questions:
1-To test that this is in fact the issue, i need to disable XHCI in the odroid bios. How do I do this? I only see the boot/boot.ini file, and there are no XHCI settings.
2- As I will need USB3 speed, how can I get rid of the xhci_drop_endpoint error and get my USB3 devices working at high speed?