usb 1-1: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes

[Cristian Aravena Romero]

dmesg:
[ 1.468281] usb 1-1: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-7-generic 4.2.0-7.7
ProcVersionSignature: Ubuntu 4.2.0-7.7-generic 4.2.0
Uname: Linux 4.2.0-7-generic x86_64
ApportVersion: 2.18-0ubuntu9
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0p: caravena 1187 F...m pulseaudio
 /dev/snd/controlC0: caravena 1187 F.... pulseaudio
CurrentDesktop: GNOME
Date: Wed Sep 2 20:33:18 2015
HibernationDevice: RESUME=UUID=360bd2d2-4f44-4311-86d6-4781ac81ee87
InstallationDate: Installed on 2015-07-26 (38 days ago)
InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150723)
MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3C/530U4C
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-7-generic root=UUID=4f4435ca-b877-47a5-9065-3dd624c0514e ro rootflags=subvol=@ quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.2.0-7-generic N/A
 linux-backports-modules-4.2.0-7-generic N/A
 linux-firmware 1.147
SourcePackage: linux
UdevLog: Error: [Errno 2] No existe el archivo o el directorio: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/15/2013
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: P14AAJ
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: SAMSUNG_NP1234567890
dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.board.version: FAB1
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP14AAJ:bd04/15/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3C/530U4C:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
dmi.product.name: 530U3C/530U4C
dmi.product.version: 0.1
dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Alberto Salvia Novella (es20490446e)]

@ Cristian Aravena Romero

Please edit the bug description so anyone can understand how to reproduce it and what are the results of it.

After doing so, please set the report status back to "confirmed". Thank you.

[penalvch (penalvch)]

Cristian Aravena Romero, this is not a bug. In the future, instead of making bug reports about log entries you may not be familiar with, please first review the respective man page (man dmesg). If this doesn't provide the desired clarity, one may want to engage:
* The Ubuntu Support Tracker - https://answers.launchpad.net/ubuntu/+source/linux/+addquestion
* The appropriate mailing list - http://www.ubuntu.com/support/community/mailinglists
* The Ubuntu forums - http://ubuntuforums.org/
* or one of the Ubuntu IRC channels - https://wiki.ubuntu.com/IRC/ChannelList

Thank you for your understanding.

[Colin Ian King (colin-king)]

This is just a debug information message from the xHCI (Extensible Host Controller Interface) host controller driver that caters for USB 1.x, 2.0 and 3.x compatible devices. The message is just indicating that it has rounded an 80 microframe interval down to the nearest lower power of two microframe interval of 64 frames. It is not a bug.

[asgard2 (kamp000x)]

I am running 16.04, I got this message with a LogiLink 4 Port USB Hub (UA0087) and Logitech mouse connected:

[ 206.535365] hub 3-1:1.0: USB hub found
[ 206.535695] hub 3-1:1.0: 4 ports detected
[ 230.083307] usb 3-1.1: new low-speed USB device number 6 using xhci_hcd
[ 230.195903] usb 3-1.1: New USB device found, idVendor=046d, idProduct=c062
[ 230.195913] usb 3-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 230.195919] usb 3-1.1: Product: USB Laser Mouse
[ 230.195924] usb 3-1.1: Manufacturer: Logitech
[ 230.196396] usb 3-1.1: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 230.204342] input: Logitech USB Laser Mouse as /devices/pci0000:00/0000:00:1c.3/0000:04:00.0/usb3/3-1/3-1.1/3-1.1:1.0/0003:046D:C062.0002/input/input16
[ 230.259871] hid-generic 0003:046D:C062.0002: input,hidraw0: USB HID v1.10 Mouse [Logitech USB Laser Mouse] on usb-0000:04:00.0-1.1/input0