Public bug reported:

My HP dm3z-2000 laptop works out of box for everything with Ubuntu
16.04, but fails to boot up after upgraded to 16.10. The upgrading went
smooth itself.

Laptop still can boot up with the latest 4.4 kernel of 16.04 which I did
a regular update/upgrade before 16.10 release upgrade.

Then I tried to boot with 16.10 Live USB and got same result.

It also can boot up with kernel 4.8 if "acpi=off" parameter in place,
but it takes long time to boot up. Everything seems fine after logged
in.

I couldn't get any log files since the system won't boot up, Ctrl+Alt+F1
does nothing. I can only see some messages in text boot mode, so I took
a screen shot with my phone and attached here.

Let me know how to get more details.

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: yakkety

** Attachment added: "u16.10boothang.jpg"
   
https://bugs.launchpad.net/bugs/1635447/+attachment/4764580/+files/u16.10boothang.jpg

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https://bugs.launchpad.net/bugs/1635447

Title:
  Upgraded or Live USB 16.10 hangs at boot up blank purple screen

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