Disabling USB 3.0
Now this isn't specific to ardour but I think there might be a good community of users here that could help. Feel free to suggest other places to ask this.
I have a Presonus 1818VSL which works very well on my desktop in a USB 2.0 port. On my laptop on the other hand with only USB 3.0 ports and an Ivy Bridge USB controller. It seems like the card cannot sync because there is intermittent playback and correspondingly intermittent Xruns in Jack. Windows users have experienced similar problems on Ivy Bridge USB 3.0 only systems. It seems that somewhere along the way Intel didn't follow the USB spec and their controller is not capable of handling large packet streaming data well. They were aware of this but overlooked it since to thier opintion it wouldn't affect too many users. Solutions so far have either disabled usb 3.0 support in BIOS (my bios menu has no such option), or uninstalled the intel xhci driver.
So basically I want my USB 3.0 ports to become USB 2.0. I have done a little reading suggesting that the kernel module xhci should be blacklisted and removed. However,
modprobe -r xhci returns:
FATAL: Module ehci not found.
And addiing blacklist xhci to the /etc/modprobe.d/blacklist.conf does not solve the problem.
Does anybody have any ideas on how I could get my USB 3.0 ports acting as though they were 3.0?