I have a MacBook Pro 13" from 2013, running Debian8 with the backported kernel 
(4.2).
The SD-card reader works randomly: sometimes it is perfectly recognized at boot 
and works as expected without a glitch as long as you don't suspend/restart the 
computer.

But most of the time (>50% of the boot) the card reader is not
recognized. Then inserting a card, nothing in dmesg, not seen in the
lsusb, ... and there is a "timeout" message about xhci-hcd (USB3
driver).

Are there option to load xhci with longer timeout ?

Cheers,

Jerome

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https://bugs.launchpad.net/bugs/1531653

Title:
  Macbook Pro Retina 11,1 SD Card Reader Doesn't Work

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