This bug was fixed in the package linux-oem - 4.15.0-1050.57

---------------
linux-oem (4.15.0-1050.57) bionic; urgency=medium

  * bionic/linux-oem: 4.15.0-1050.57 -proposed tracker (LP: #1839261)

  * Packaging resync (LP: #1786013)
    - [Packaging] update helper scripts

  [ Ubuntu: 4.15.0-58.64 ]

  * unable to handle kernel NULL pointer dereference at 000000000000002c (IP:
    iget5_locked+0x9e/0x1f0) (LP: #1838982)
    - Revert "ovl: set I_CREATING on inode being created"
    - Revert "new primitive: discard_new_inode()"

 -- Chia-Lin Kao (AceLan) <acelan....@canonical.com>  Wed, 07 Aug 2019
18:14:17 +0800

** Changed in: linux-oem (Ubuntu Disco)
       Status: Invalid => Fix Released

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https://bugs.launchpad.net/bugs/1836308

Title:
  Unhide Nvidia HDA audio controller

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Fix Released
Status in linux-oem package in Ubuntu:
  New
Status in linux-oem-osp1 package in Ubuntu:
  New
Status in linux source package in Bionic:
  Fix Released
Status in linux-oem source package in Bionic:
  Fix Released
Status in linux-oem-osp1 source package in Bionic:
  Fix Released
Status in linux source package in Disco:
  Fix Released
Status in linux-oem source package in Disco:
  Fix Released
Status in linux-oem-osp1 source package in Disco:
  Fix Released

Bug description:
  [Impact]
  Nvidia HDA audio controller comes with Nvidia graphics cannot be found
  by PCI subsystem.

  [Fix]
  Write bit 25 at graphics' config space offset 0x488 to enable the HDA
  controller.

  [Test]
  Nvidia HDA controller is not listed under lspci.
  After applying the fix lspci can find Nvidia HDA controller.

  [Regression Potential]
  Low. This fix doesn't bring any functional change other then exposing
  HDA controller at hardware level.

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