Can you please write step by step how to do that. As I understand
usbcore.dyndbg=+p I should add to boot options. But how to get dmesg?
Just writing dmesg in bash terminal?

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https://bugs.launchpad.net/bugs/1796253

Title:
  With one flash drive connected other flash drive doesn't connect
  anymore

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have a Toshiba L855 laptop at home. When I connect any usb device to
  a USB3 port before boot then no other USB device doesn't work and even
  detected after boot. This concern even USB mouse and keyboard. But
  when I reconnect all USB devices to laptop then they started to work.
  I see this behaviour on every ubuntu 16.04.5 linux kernel i.e. version
  4.15, so I suspect that it is due to some linux-extra-module. I have
  also windows 7 OS on the same laptop and I have never struck such a
  problem there.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-modules-extra-4.15.0-36-generic 4.15.0-36.39~16.04.1
  ProcVersionSignature: Ubuntu 4.15.0-36.39~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CurrentDesktop: GNOME-Flashback:Unity
  Date: Fri Oct  5 12:17:20 2018
  SourcePackage: linux-hwe
  UpgradeStatus: Upgraded to xenial on 2018-05-25 (132 days ago)

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