Public bug reported:

[Impact]

We've found a bug on some Apollo Lake system makes it runs very slow.

[Fix]

Upstream already provided a workaround[1] to fix this problem. This
patches haven't been merged in latest(v4.7) release but already in
linux-next.

To fix this issue in Xenial it also needs another commit introduces
macros use in the workaround:

commit 970442c599b22ccd644ebfe94d1d303bf6f87c05
Author: Dave Hansen <[email protected]>
Date:   Thu Jun 2 17:19:27 2016 -0700

    x86/cpu/intel: Introduce macros for Intel family numbers

This workaround checks CPU families and certain features, so no further
regressions is expected

[1]: https://lkml.org/lkml/2016/7/6/469

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Phidias (phidias-chiang)
         Status: New


** Tags: xenial

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https://bugs.launchpad.net/bugs/1606147

Title:
  [APL][SAUCE] System works slowly due to a monitor bug

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