I got it! If I didn't mess it up but I don't think so.

Side question: do you have to do "fakeroot debian/rules clean" for every
step when bisecting? The guide was a bit unclear on that. I was just
thinking the compile process might be quicker if I didn't do clean in
between..

19114b5458510b757cd2801e64094e4062e4067f is the first bad commit
commit 19114b5458510b757cd2801e64094e4062e4067f
Author: Lv Zheng <[email protected]>
Date:   Wed Jul 1 14:43:34 2015 +0800

    ACPICA: Tables: Enable default 64-bit FADT addresses favor
    
    BugLink: http://bugs.launchpad.net/bugs/1479048
    
    commit 0ea61381788a37d864f9841b0fe97d40f7058f3b upstream.
    
    ACPICA commit 4da56eeae0749dfe8491285c1e1fad48f6efafd8
    
    The following commit temporarily disables correct 64-bit FADT addresses
    favor during the period the root cause of the bug is not fixed:
     Commit: 85dbd5801f62b66e2aa7826aaefcaebead44c8a6
     ACPICA: Tables: Restore old behavor to favor 32-bit FADT addresses.
    
    With enough protections, this patch re-enables 64-bit FADT addresses by
    default. If regressions are reported against such change, this patch should
    be bisected and reverted.
    Note that 64-bit FACS favor and 64-bit firmware waking vector favor are
    excluded by this commit in order not to break OSPMs. Lv Zheng.
    
    Link: https://bugzilla.kernel.org/show_bug.cgi?id=74021
    Link: https://github.com/acpica/acpica/commit/4da56eea
    Reported-and-tested-by: Oswald Buddenhagen <[email protected]>
    Signed-off-by: Lv Zheng <[email protected]>
    Signed-off-by: Bob Moore <[email protected]>
    Signed-off-by: Rafael J. Wysocki <[email protected]>
    Signed-off-by: Kamal Mostafa <[email protected]>
    Signed-off-by: Luis Henriques <[email protected]>

:040000 040000 0b002dc7d6e5abe0ded978926361d88efd5a0f88
27c36ea102b1622ded7beecbca477f62fa33922a M      include

** Bug watch added: Linux Kernel Bug Tracker #74021
   http://bugzilla.kernel.org/show_bug.cgi?id=74021

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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  Updating 14.04.3 to latest updates renders system unbootable

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