re #31, in my original bug report, I'd tentatively concluded this was an issue with USB3 and I note in your report you also have issues with USB3. For me, as I mentioned in #23, installing the updated sane backends pretty much fixed this problem for me on a USB3 root hub. It's still fairly temperamental though, the major annoyance being it seems to take 30s to a minute to start scanning.
Personally, I think the USB3 subsystem is as buggy as anything, particularly with slower devices. I have encountered numerous spurious messages emitted from the kernel and complete system lockups all related to USB regardless of the type of peripheral in use. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to sane-backends in Ubuntu. https://bugs.launchpad.net/bugs/1250196 Title: sane plustek backend not working on USB 3 root hub Status in sane-backends package in Ubuntu: Fix Committed Status in sane-backends package in Fedora: New Status in sane-backends package in Gentoo Linux: Unknown Bug description: I have a HP Scanject 2100c and a Canoscan LIDE-25 both of which use the Sane plustek backend for comms. My PC only has a USB 3 root hub, when either of these devices are connected, either directly or via an external USB 2 hub, they do not work. In general (although not always), 'scanimage -L' will detect the scanner ok: device `plustek:libusb:001:012' is a Hewlett-Packard Scanjet 2100c flatbed scanner however there is always about a 30s delay before the shell prompt is returned. Scanning always fails however, using the suggested method on the sane HOW-TO page: scanimage -vvv -format pnm >outfile.pnm Calling sane_exit is the usual response. By enabling debug on the plustek backend, the response I normally get results in the following: [plustek] Vendor ID=0x03F0, Product ID=0x0505 [plustek] usbio_DetectLM983x [plustek] * could not read version register! [plustek] open failed: -1 [plustek] sane_get_devices (0x7fff0686dbc8, 0) In an effort to try and diagnose this, I've build the latest SANE backends from scratch and tried out the latest libusb none of which has resolved the issue. My original kernel was a 3.5.x, I pushed it up to 3.8.0-30 this also made no difference. My guess based on what I've seen is that this is related to the USB 3 hub. The HP Scanjet worked ok on my old Linux box (a 2.6.27 kernel with USB 2 hub) and I've had the Canon one working (albeit not that reliably) on a Raspberry Pi with a 3.6.11 kernel. The key difference (aside from this being a 64 bit flavour of Linux) is the USB. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: libsane 1.0.22-7ubuntu1 ProcVersionSignature: Ubuntu 3.8.0-30.44~precise1-generic 3.8.13.6 Uname: Linux 3.8.0-30-generic x86_64 ApportVersion: 2.0.1-0ubuntu17.5 Architecture: amd64 Date: Mon Nov 11 19:41:08 2013 InstallationMedia: Ubuntu-Server 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130214) MarkForUpload: True ProcEnviron: LANGUAGE=en_GB:en TERM=xterm PATH=(custom, no user) LANG=en_GB.UTF-8 SHELL=/bin/bash SourcePackage: sane-backends UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/sane-backends/+bug/1250196/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
