This bug was fixed in the package linux-oem - 4.15.0-1024.29

---------------
linux-oem (4.15.0-1024.29) bionic; urgency=medium

  * linux-oem: 4.15.0-1024.29 -proposed tracker (LP: #1797069)

  * Keyboard backlight sysfs sometimes is missing on Dell laptops (LP: #1797304)
    - platform/x86: dell-smbios: Correct some style warnings
    - platform/x86: dell-smbios: Rename dell-smbios source to dell-smbios-base
    - platform/x86: dell-smbios: Link all dell-smbios-* modules together
    - [Config] CONFIG_DELL_SMBIOS_SMM=y, CONFIG_DELL_SMBIOS_WMI=y
    - [Config] CONFIG_DELL_SMBIOS_SMM=y, CONFIG_DELL_SMBIOS_WMI=y

  [ Ubuntu: 4.15.0-38.41 ]

  * linux: 4.15.0-38.41 -proposed tracker (LP: #1797061)
  * Silent data corruption in Linux kernel 4.15 (LP: #1796542)
    - block: add a lower-level bio_add_page interface
    - block: bio_iov_iter_get_pages: fix size of last iovec
    - blkdev: __blkdev_direct_IO_simple: fix leak in error case
    - block: bio_iov_iter_get_pages: pin more pages for multi-segment IOs

 -- Chia-Lin Kao (AceLan) <acelan....@canonical.com>  Tue, 16 Oct 2018
10:32:03 +0800

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

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https://bugs.launchpad.net/bugs/1795784

Title:
  Fix usbcore.quirks when used at boot

Status in linux package in Ubuntu:
  Fix Released
Status in linux-oem package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Committed
Status in linux-oem source package in Bionic:
  Fix Released
Status in linux source package in Cosmic:
  Fix Released
Status in linux-oem source package in Cosmic:
  New

Bug description:
  [Impact]
  Use usbcore.quirks kernel parameter let the boot stuck.

  [Test]
  Without the patch, the usbcore.quirks= doesn't work when usbcore is
  builtin. The issue is fixed with the patch.

  [Fix]
  If the parameter is used at boot, parse the list after the slab is
  initialized. When the kcalloc fails, reset the count to 0.

  [Regression Potential]
  Low. The change limits to quirk parsing, the usbcore behaviour stays the
  same.

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