Tested with 3.15.0-031500rc2-generic. Details available in below.
Bottomline --- bug still exists; I am unable to hibernate the device,
although suspend still works well.

# booted with no_console_suspend, switched to VT-1

sudo su
cd /sys/power
cat disk pm_test state

lsmod > lsmod.output.txt
dmesg > dmesg-output.txt

echo devices > pm_test
echo platform > disk
echo disk > state
dmesg > dmesg-devices-platform.txt

echo core > pm_test
echo platform > disk
echo disk > state
dmesg > dmesg-core-platform.txt

# ^^ the only messages were from pciehp not able to hot-add existing
devices

echo core > pm_test
echo reboot > disk
echo disk > state
dmesg > dmesg-core-reboot.txt

# ^^ pciehp still complained; no (machine) reboot happened
# just that the machine took a quick nap and woke up again
# but I guess, that is how the pm_test functionality works

echo none > pm_test
echo shutdown > disk
echo disk > state

# ^^ machine powered down and did not come up after reboot

# logged into desktop after booting up

dmesg > dmesg-after-reboot.txt
sudo pm-hibernate

# ^^ failed to resume after reboot yet again

dmesg > dmesg-after-pm-hibernate.txt


** Attachment added: "README.debug.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1313300/+attachment/4098943/+files/README.debug.txt

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https://bugs.launchpad.net/bugs/1313300

Title:
  [HP Compaq 6530b Notebook PC] Unable to hibernate with Ubuntu 14.04

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