SRU reguest for lp#254783

[Stefan Bader]

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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/254783

Note: the patch is mostly a cherry-pick but needed one function moved around.

SRU justification:

Impact: The USB-PERSIST feature (0458d5b4c9cc4ca0f62625d0144ddc4b4bc97a3c) lets
USB mounted filesystems remain intact (the USB device not removed) during power
loss. This is important for small machines that have their root fs on a USB
device. However this did not work in all cases.

Fix: A patch (5e6effaed6da94e727cd45f945ad2489af8570b3) that followed later
fixed the persist problem to work on all sleep states instead of supporting
only those where the hub lost power.

Testcase: Suspend fails on the classmate PC without this patch.

- --

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