Sure thing.

Could you please add this to "Vivid"? It appears the latest kernel
release for 14.04.3 may now suffer from this issue too.



============================================================
Matthew Giassa, MASc, BASc, EIT
Security and Embedded Systems Specialist
linkedin: https://ca.linkedin.com/in/giassa
e-mail:   <email address hidden>
website:  www.giassa.net

> -------- Original Message --------
> Subject: [Bug 1577024] Re: Kernel 4.2.X and 4.4.X - Fix USB3.0 link
> power management (LPM) claim/release logic in USBFS
> From: Joseph Salisbury <email address hidden>
> Date: Thu, May 05, 2016 11:09 am
> To: <email address hidden>
> 
> 
> Can you add a comment here when the patch makes it into mainline?  We
> can then cherry-pick and SRU it.
> 
> ** Tags added: kernel-da-key
> 
> ** Changed in: linux (Ubuntu)
>        Status: Confirmed => Triaged
> 
> ** Changed in: linux (Ubuntu)
>    Importance: Undecided => Medium
> 
> ** No longer affects: linux-image-4.2.0-rc7 (Ubuntu)
> 
> ** Also affects: linux (Ubuntu Xenial)
>    Importance: Undecided
>        Status: New
> 
> ** Also affects: linux (Ubuntu Wily)
>    Importance: Undecided
>        Status: New
> 
> ** Changed in: linux (Ubuntu Wily)
>        Status: New => Triaged
> 
> ** Changed in: linux (Ubuntu Xenial)
>        Status: New => Triaged
> 
> ** Changed in: linux (Ubuntu Wily)
>    Importance: Undecided => Medium
> 
> ** Changed in: linux (Ubuntu Xenial)
>    Importance: Undecided => Medium
> 
> -- 
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1577024
> 
> Title:
>   Kernel 4.2.X and 4.4.X - Fix USB3.0 link power management (LPM)
>   claim/release logic in USBFS
> 
> Status in linux package in Ubuntu:
>   Triaged
> Status in linux source package in Wily:
>   Triaged
> Status in linux source package in Xenial:
>   Triaged
> 
> Bug description:
>   I am currently carrying out kernel testing and debugging with Alan Stern on the mainline kernel. Alan has proposed a patch to resolve a bug in USBFS that causes USB machine vision cameras to fail on kernels that contain the following patch:
>       commit e951f84074b84a3f5aecbffd01da74576e0068d5
>       Author: Lu Baolu <email address hidden>
>       Date:   Tue Jun 16 09:08:26 2015 +0800
>       usb: core: lpm: set lpm_capable for root hub device
>       commit 2d2a316765d956bc5cb6bb367b2ec52ca59ab8e9 upstream.
> 
>   There is an issue in this patch that impacts software that rapidly
>   issues claim/release calls in USBFS, and all of our customers that use
>   Ubuntu 14.04.4 (kernel 4.2.x) and Ubuntu 16.04 (kernel 4.4.x) are
>   unable to communicate with their machine vision cameras using our
>   software stack.
> 
>   The patch for the mainline kernel is being tested, and is currently posted, along with a history of this issue, at:
>   https://bugzilla.kernel.org/show_bug.cgi?id=115961
> 
>   Right now, all of our customers have to either use an older kernel, or
>   manually patch their own kernel with the fix provided by Alan if they
>   are required to use a newer kernel. I am raising this bug so that,
>   once the patch is submitted to the the mainline/linus series, it can
>   be included in the next "monthly" kernel update made available to the
>   general public, and so our customers can just run a normal "vanilla"
>   system without having to rely on manually patching their kernel every
>   time they need to update.
> 
>   I can be contacted at:
>   <email address hidden>
>   <email address hidden>
> 
>   Thank you.
> 
>   ProblemType: Bug
>   DistroRelease: Ubuntu 14.04
>   Package: linux-image-3.13.0-55-generic 3.13.0-55.94
>   ProcVersionSignature: Ubuntu 3.13.0-55.94-generic 3.13.11-ckt20
>   Uname: Linux 3.13.0-55-generic i686
>   NonfreeKernelModules: nvidia
>   ApportVersion: 2.14.1-0ubuntu3.19
>   Architecture: i386
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC0:  owner      4035 F.... pulseaudio
>   CurrentDesktop: Unity
>   Date: Sat Apr 30 10:36:15 2016
>   EcryptfsInUse: Yes
>   HibernationDevice: RESUME=UUID=0287e25d-68d6-4390-aced-c682b8e13b60
>   InstallationDate: Installed on 2013-09-23 (949 days ago)
>   InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release i386 (20130820.1)
>   IwConfig:
>    lo        no wireless extensions.
>    
>    cscotun0  no wireless extensions.
>    
>    eth0      no wireless extensions.
>   MachineType: Hewlett-Packard HP xw4600 Workstation
>   ProcFB:
>    
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-55-generic root=UUID=292845c9-c333-4592-aa06-bc01f45d3ee6 ro quiet splash
>   RelatedPackageVersions:
>    linux-restricted-modules-3.13.0-55-generic N/A
>    linux-backports-modules-3.13.0-55-generic  N/A
>    linux-firmware                             1.127.19
>   RfKill:
>    
>   SourcePackage: linux
>   UpgradeStatus: Upgraded to trusty on 2014-07-30 (639 days ago)
>   dmi.bios.date: 07/09/2012
>   dmi.bios.vendor: Hewlett-Packard
>   dmi.bios.version: 786F3 v01.34
>   dmi.board.asset.tag: CAC94101JZ
>   dmi.board.name: 0AA0h
>   dmi.board.vendor: Hewlett-Packard
>   dmi.chassis.asset.tag: CAC94101JZ
>   dmi.chassis.type: 6
>   dmi.chassis.vendor: Hewlett-Packard
>   dmi.modalias: dmi:bvnHewlett-Packard:bvr786F3v01.34:bd07/09/2012:svnHewlett-Packard:pnHPxw4600Workstation:pvr:rvnHewlett-Packard:rn0AA0h:rvr:cvnHewlett-Packard:ct6:cvr:
>   dmi.product.name: HP xw4600 Workstation
>   dmi.sys.vendor: Hewlett-Packard
> 
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