We can perform a "Reverse" bisect to identify the commit that fixes this
bug in 4.15.  We first need to identify the last kernel version that had
the bug and the first that did not.  Can you try the following two
kernels:

v4.14-rc1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14-rc1/
v4.15-rc1:http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc1/

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

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

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

** Also affects: linux (Ubuntu Artful)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Artful)
       Status: New => Triaged

** Tags added: kernel-da-key needs-bisect

** Changed in: linux (Ubuntu Artful)
   Importance: Undecided => High

** Tags removed: needs-bisect
** Tags added: performing-bisect

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https://bugs.launchpad.net/bugs/1748675

Title:
  Laptop freezes seconds after displaying the login screen

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