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location Ontario
age 37
visits member for 1 year, 6 months
seen Apr 8 at 0:36

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Feb
20
comment 2012 MacBook Air - USB hardware ran out of device slots?
Unloading the kexts (in a shell script, since the keyboard is a USB device) causes an immediate panic and reboot. Your answer doesn't solve the problem, but it provides very valuable information and a few directions to pursue in resolving it. Thank you, I'm accepting this answer and awarding the bounty to you.
Feb
18
comment 2012 MacBook Air - USB hardware ran out of device slots?
"The log snippet posted does indicate what I addressed above: too many USB 3.0 devices connected to the root XHCI hub." -- doesn't this indicate a driver bug? I don't have more than one device plugged into the port (and it's not a hub)... isn't the driver forgetting to clean up after itself?
Feb
17
comment 2012 MacBook Air - USB hardware ran out of device slots?
I appreciate your taking the time to answer, but I would like to know how you are certain that it is a software issue (I suspect it is as well). Also, if it is a software issue, is there an easy way to reinstall just the specific subsection (XHCI drivers?) that would be causing the issue?
Feb
17
comment 2012 MacBook Air - USB hardware ran out of device slots?
I've edited my question to address your assumptions. Unfortunately no, this Mac was a brand new install, not a migration from my older MBA. There wasn't anything copied over, no settings or any applications.
Feb
17
comment 2012 MacBook Air - USB hardware ran out of device slots?
One other thing... you mention that you can recreate the issue. How are you doing it? Do you require a reboot to clear the error?
Feb
17
comment 2012 MacBook Air - USB hardware ran out of device slots?
Thank you for your detailed answer, but I think you're assuming that the problem occurs when I use external hubs / chain hubs together. I've updated my question to include more detail, in particular the fact that USB thumb drives (no cables) and low-speed and externally-powered equipment (JTAG/serial adapters, etc.) still exhibit the issue. Excellent catch on the power supply, but I do have the bigger (85W) adapter. Problem occurs whether it's plugged in to AC power or not.
Oct
18
comment USB intermittently not working - requires restart - what to try next?
I have been having this problem intermittently on my 2012 11" MBA. Reboot fixes it. It's not a powering issue; I can try to power the device (any device) externally and the port is still deaf. SMC/PRAM reset is inconclusive since the reboot will fix it on its own.