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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1773520

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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https://bugs.launchpad.net/bugs/1773520

Title:
  After update to 4.13-43 Intel Graphics are Laggy

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  After update to Kernel 4.13-43 the intel graphics seem to really lag -
  especially noticeable in apps which are using vsync, which, at least
  on my system, locks to 40fps unlike the previous kernel I have
  installed (4.13-41) which locks at a steady 60fps.

  See https://askubuntu.com/questions/1039189/today-i-got-an-update-and-
  graphics-are-not-working-right-on-ubuntu-16-04/1040545#1040545 for
  some other users with the same issue

  In short 
  4.13-41 doesn't have the problem
  4.13-43 has the laggy problem

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