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[Ioannis Vranos <1437492@xxxxxxxxxxxxxxxxxx>]

I have the sane bug, "error -110" USB error messages, and when I reboot,
the computer's UEFI initialisation during boot, at the USB device stage,
is very slow.

The problem gets fixed temporarily, if you unplug the computer from the
power socket (or turn off the power switch, at the back of the
computer), and leave it off until the motherboard loses all its power.

It looks like it is some kernel 3.19 bug with USB ports. Some USB ports
remain powered on, if you shutdown the computer, for charging devices,
etc.

If you remove the power plug, all USB ports turn off, so the issue gets
fixed, until the issue reappears at some random tie, when the kernel
gets loaded again.

The issue does not exist with buntus 14.04/14.04.2, and 14.10.

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https://bugs.launchpad.net/bugs/1437492

Title:
  boot stalls on USB detection errors

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  My system boots slow. I investigated this and it seems systemd-udev-settle.service is the culprit.
  My system runs ext4 with GPT on UEFI.
  I do not use encryption or LVM.

  $ journalctl -u systemd-udev-settle
  -- Logs begin at fri 2015-03-27 19:03:06 CET, end at fri 2015-03-27 22:06:32 CET. --
  mar 27 19:03:42 hostname systemd[1]: Started udev Wait for Complete Device Initialization.

  $ systemd-analyze
  Startup finished in 14.865s (firmware) + 11.133s (loader) + 6.127s (kernel) + 42.079s (userspace) = 1min 14.206s

  $ systemd-analyze critical-chain
  http://paste.ubuntu.com/10691416/

  $ systemd-analyze blame
  36.013s systemd-udev-settle.service
  http://paste.ubuntu.com/10691314/

  $ systemctl show systemd-udev-settle.service -p RequiredBy
  RequiredBy=

  $ systemctl show systemd-udev-settle.service -p WantedBy
  WantedBy=friendly-recovery.service

  $ systemd-analyze plot > boot.svg
  http://imgh.us/boot_1.svg

  $ systemd-analyze dump
  http://paste.ubuntu.com/10691856/

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: systemd 219-5ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
  Uname: Linux 3.19.0-10-generic x86_64
  ApportVersion: 2.16.2-0ubuntu5
  Architecture: amd64
  CurrentDesktop: GNOME-Flashback:Unity
  Date: Fri Mar 27 22:05:28 2015
  InstallationDate: Installed on 2013-12-26 (455 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: ASUS All Series
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-10-generic.efi.signed root=UUID=31dc4488-28d4-4d2a-aa51-6733e237d5f8 ro quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/18/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2103
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z87-PRO
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2103:bd08/18/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ87-PRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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