SRU request for LP#152187

[Stefan Bader]

https://bugs.launchpad.net/ubuntu/+bug/152187

SRU justification:

Impact: Some devices fail to operate after suspend. The bug is
restricted to the serial Wacom tablet but the scope of this might be
larger. The underlying problem is that acpi allows irq to be represented
as 3 or 4 byte descriptors. Linux always converted those to 3 byte
versions. Irq descriptors are written before suspend and they have to be
in the format they were read. This wasn't honored by Linux and would
cause problems.

Patch: [attached]. Unfortunately a bit large and causes an ABI bump. The
patch is being in the process to get integrated into mainline but due to
the complicated nature of acpi fixes this has been delayed.

Testcase: Suspend and resume with serial Wacom tablet attached. See bug
report for verification feedback.
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