In AMD 64 14.04 dmesg shows xHCI drop endpoint and other repeating problems

[Robin]

dmesg | tail -n 35 |less
Extract:

[ 337.978401] xhci_hcd 0000:00:10.0: xHCI xhci_drop_endpoint called with disabled ep ffff880414902d90
[ 337.978405] xhci_hcd 0000:00:10.0: xHCI xhci_drop_endpoint called with disabled ep ffff880416e56b40
[ 337.979961] cdc_acm 6-2.3:1.1: This device cannot do calls on its own. It is not a modem.
[ 337.980023] cdc_acm 6-2.3:1.1: ttyACM0: USB ACM device
[ 893.965035] capability: warning: `VirtualBox' uses 32-bit capabilities (legacy support in use)
[ 906.135939] usblp1: removed
[ 906.140645] device eth0 entered promiscuous mode
[ 1121.936646] usb 6-2.3: reset high-speed USB device number 6 using xhci_hcd
[ 1122.040414] xhci_hcd 0000:00:10.0: xHCI xhci_drop_endpoint called with disabled ep ffff880414902d48

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.16.0-43-generic 3.16.0-43.58~14.04.1
ProcVersionSignature: Ubuntu 3.16.0-43.58~14.04.1-generic 3.16.7-ckt13
Uname: Linux 3.16.0-43-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
CurrentDesktop: GNOME
Date: Thu Jul 9 16:02:37 2015
InstallationDate: Installed on 2015-07-07 (2 days ago)
InstallationMedia: Ubuntu-GNOME 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: linux-lts-utopic
UpgradeStatus: No upgrade log present (probably fresh install)

[penalvch (penalvch)]

Robin, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1473105

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]