[Bug 1475129] [NEW] HP EliteBook 9480m and others crash when sleeping docked and resuming undocked

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I've seen this bug on multiple versions of Ubuntu (14.04 and 15.04) and
with multiple hardware (HP EliteBook 9470m, HP EliteBook 9480m, and HP
EliteBook 820). Not surprising since they appear to share a bios core.
They are all running latest BIOS.

Sleep/resume normally works fine, but if I allow it to sleep while in
the docking station, and then I undock it and resume it, it appears to
try to resume, then after half a second or so, it flashes back to POST
screen and boots fresh. It looks to me like the resume operation crashes
somehow and it reboots.


Observations:

It does not matter if there are any monitors pluged into the docking station.
I've tried toggling deep-sleep in bios, no effect.
I've tried toggling USB3 in bios, no effect.

I can't find any indication of a crash or a reason for the reboot in any
of the logs. I added  the dmesg from EliteBook 820 because it's the
simpler installation. I have Bluetooth, Camera, and audio turned off in
bios for various reasons. It is also docked in a monitor-less dock (I
use it for charging).

Please let me know what other information I can provide.

** Affects: pm-utils (Ubuntu)
     Importance: Undecided
         Status: New

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HP EliteBook 9480m and others crash when sleeping docked and resuming undocked
https://bugs.launchpad.net/bugs/1475129
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