On 04.04.2016 12:06, Olliver Schinagl wrote:
Hi list,
I have a Apple Inc. MacBookPro11,1 (with the most recent 'bios': BIOS MBP111.88Z.0138.B16.1509081438 09/08/2015).
At the beginning, USB worked normally. After a while (and after newer kernel versions released by debian?) things started to act strangely. For one, the bios/efi boot takes a very long time (probably due to the same reason I describe later) just to get to the bootloader/grub. Likley resetting and probing for USB ports/mass storage. When grub finally pops up, I can use the (internal USB based keyboard) normally to select a grub entry etc.
Booting the kernel then works reasonably fine, until it loads the xhci module.
It spews some messages in dmesg (taking some 15 seconds) and only then, the keyboard starts to work again.
The log is filled with messages like:
[ 7.248479] xhci_hcd 0000:00:14.0: Command completion event does not match command
[ 7.248495] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[ 12.256347] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[ 12.256363] usb 1-2: hub failed to enable device, error -62
[ 17.264166] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
(followed by USB hub/device enumeration)
Could be related to the usb wide -> per bus locking changes.
xHCI handles both a usb2 and usb3 bus.
There's a possible fix here:
http://marc.info/?l=linux-usb&m=145493945408601&w=2
Does it help?
-Mathias
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