There have been some developments with this problem so I thought I should post the latest news.
Firstly, I have reported the problem as directed above to the people concerned and the netdev team twice, but there has been no response. Secondly, I managed to narrow down the cause of the problem in the codeline only to then discover that its a known issue. A suggested patch to fix the problem was rejected with the expectation that applications would have to be changed to handle the new kernel network code. Further details may be viewed here:- https://patchwork.ozlabs.org/patch/618164/ <begin rant> No doubt the sentiments expressed in the post are valid, but they seem rather inflexible and harsh to me given that the failing applications were working. Ultimately if an application is not changed, users will be stuck. In my case its no network scanner. Seems crazy to me when a simple change will resolve the problem. <end rant> The application in point here (bug 1613027) is the Epson network plugin. Unfortunately Epson or the authoring 3rd party do not publish the source code and my efforts through Epson support to try to raise the issue or trace the origin of the network plugin have been fruitless. So for anyone experiencing the problem here, and it looks like there is at least one, what to do... 1. Do nothing and only have a usb scanner. 2. Download the Linux kernel source code every time there is a new release and apply the suggested patch yourself. 3. Override the system 'listen' function with 'dlsym' whenever the network plugin is invoked. This is what I have done. To this end I have created a repository on my git home page here:- https://github.com/mr-headwind/ListenOverride This should only be viewed as a temporary workaround, but given the circumstances I suspect it may be permanent. Regards. Tony -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1613027 Title: Network scanner not detected by xsane after kernel upgrade Status in linux package in Ubuntu: Triaged Bug description: Hopefully I'm reporting this in the correct area/group. Sorry if not. After upgrading to 16.04, my scanner is no longer detected by xsane (and other scan apps.) The model is 'Epson WF-3520' multi-function and is connected wirelessly to the network. The problem occurs on all my computers: A Dell 64 bit desktop, An Asus 64 bit laptop, A Medion 32 bit laptop. I've upgraded to the latest software released by the manufacturer on 2 computers, but it makes no difference. Printing works OK and also the scanner is detected if I connect using a USB cable (a second printer is installed though). The problem only occurs using the 'linux-image-4.4.0...' series of kernels. If I boot with any of the previous kernels available, 'linux-image-4.2.0...' or 'linux-image-3.19.0...' everything works OK. I am able to ping the scanner. I've tried a number of suggested fixes from searching around various forums, although many of these relate to 'back-end' scanners connected to a host for network access which is not applicable as mine is connected directly to the network. In any case none have worked. I have tried the following: . Removing all manufacturer software and /usr/sane.d/epkowa.conf . Comment out all entries in the /usr/sane.d/dll (Back-end related) . Comment out all entries in the /usr/sane.d/dll.conf.conf except 'net' and adding 'epkowa' (Back-end related) . Disable the firewall (ufw) . Specifically adding a port to use (1865) (ie. net 192.1... 1865 . Linking the libraries in /usr/lib/sane to /usr/lib/x86_64-linux-gnu/sane Other than that I'm at a loss and sticking with older kernels. Regards. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-34-generic 4.4.0-34.53 ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15 Uname: Linux 4.4.0-34-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: tony 4520 F.... pulseaudio /dev/snd/controlC1: tony 4520 F.... pulseaudio CurrentDesktop: Unity Date: Sun Aug 14 16:37:16 2016 HibernationDevice: RESUME=UUID=762f657a-d174-4173-b09d-52d580c09a91 InstallationDate: Installed on 2013-10-01 (1047 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MachineType: ASUSTeK Computer Inc. N71Jq ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-34-generic root=UUID=dea23950-d6b3-498c-abba-a94513b58579 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-34-generic N/A linux-backports-modules-4.4.0-34-generic N/A linux-firmware 1.157.3 SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-07-30 (14 days ago) dmi.bios.date: 12/24/2009 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: N71Jq.204 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: N71Jq dmi.board.vendor: ASUSTeK Computer Inc. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK Computer Inc. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN71Jq.204:bd12/24/2009:svnASUSTeKComputerInc.:pnN71Jq:pvr1.0:rvnASUSTeKComputerInc.:rnN71Jq:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0: dmi.product.name: N71Jq dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK Computer Inc. 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