Re: [sane-devel] Is the Iscan backend "epkowa" also affected by USB3 issues?
Hello Olaf, On Apr 28 08:45 Olaf Meeuwissen wrote (excerpt): The epkowa backend uses its own *copy* of the sanei_usb code. There was a minor fix for USB 3.0 connected scanners in 2.30.1 (dated 2014-12-03). That same fix was applied to sane-backends on 2014-12-10. Please note that iscan does *not* actively track changes to the sane-backends version of the sanei_usb code. Also, iscan-2.30.1 is the most recent version. In the end I like to understand if a version change of the installed sane-backends software on the user's computer could make a difference whether or not the "epkowa" backend works with the xhci_hcd kernel module. That is rather unlikely but not impossible as it may depend on what other backends do during their sane_init() and sane_get_devices(). If all other backends are disabled, changing the version of the installed sane-backends should not make a difference. That is because the dll backend doesn't do anything USB related itself. Hope this helps, Many thanks for your explanation. It helps a lot! Kind Regards Johannes Meixner -- SUSE LINUX GmbH - GF: Felix Imendoerffer, Jane Smithard, Graham Norton - HRB 21284 (AG Nuernberg) -- sane-devel mailing list: sane-devel@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel Unsubscribe: Send mail with subject "unsubscribe your_password" to sane-devel-requ...@lists.alioth.debian.org
Re: [sane-devel] Is the Iscan backend "epkowa" also affected by USB3 issues?
Hi Johannes, I'll forward your question as I am no longer doing any scanner work at the office (as of the end of March 2016). As we are just one day away from Golden Week[1], it will probably take a while before you get an answer (if at all). I think people will only get back to the office on 2016-05-09. [1] https://en.wikipedia.org/wiki/Golden_Week_(Japan) OK, now on to your question, Johannes Meixner writes: > [...] > Now I wonder if the "epkowa" backend could be also affected by the > current sane-backends 1.0.25 "Workaround for USB3 problems in Linux > kernel" that seems to no longer work with newest kernels, cf. > http://lists.alioth.debian.org/pipermail/sane-devel/2016-January/034254.html > > In other words, I wonder if the "epkowa" backend uses the > sane-backends USB code or if the "epkowa" backend implements USB > communication on its own. The epkowa backend uses its own *copy* of the sanei_usb code. There was a minor fix for USB 3.0 connected scanners in 2.30.1 (dated 2014-12-03). That same fix was applied to sane-backends on 2014-12-10. Please note that iscan does *not* actively track changes to the sane-backends version of the sanei_usb code. Also, iscan-2.30.1 is the most recent version. > In the end I like to understand if a version change of the installed > sane-backends software on the user's computer could make a difference > whether or not the "epkowa" backend works with the xhci_hcd kernel > module. That is rather unlikely but not impossible as it may depend on what other backends do during their sane_init() and sane_get_devices(). If all other backends are disabled, changing the version of the installed sane-backends should not make a difference. That is because the dll backend doesn't do anything USB related itself. Hope this helps, -- Olaf Meeuwissen, LPIC-2 FLOSS Engineer -- EPSON AVASYS CORPORATION Free Software Foundation Associate Member since 2004-01-27 Support Free Software https://my.fsf.org/donate Join the Free Software Foundationhttps://my.fsf.org/join -- sane-devel mailing list: sane-devel@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel Unsubscribe: Send mail with subject "unsubscribe your_password" to sane-devel-requ...@lists.alioth.debian.org
[sane-devel] Is the Iscan backend "epkowa" also affected by USB3 issues?
Hello Olaf Meeuwissen, we (i.e. openSUSE) got an issue report of a user who uses the "epkowa" backend for an Epson GT-X770 / Perfection V500 at a USB port with the xhci_hcd kernel driver module which does not work, cf. https://bugzilla.opensuse.org/show_bug.cgi?id=976813 Now I wonder if the "epkowa" backend could be also affected by the current sane-backends 1.0.25 "Workaround for USB3 problems in Linux kernel" that seems to no longer work with newest kernels, cf. http://lists.alioth.debian.org/pipermail/sane-devel/2016-January/034254.html In other words, I wonder if the "epkowa" backend uses the sane-backends USB code or if the "epkowa" backend implements USB communication on its own. In the end I like to understand if a version change of the installed sane-backends software on the user's computer could make a difference whether or not the "epkowa" backend works with the xhci_hcd kernel module. Kind Regards Johannes Meixner -- SUSE LINUX GmbH - GF: Felix Imendoerffer, Jane Smithard, Graham Norton - HRB 21284 (AG Nuernberg) -- sane-devel mailing list: sane-devel@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel Unsubscribe: Send mail with subject "unsubscribe your_password" to sane-devel-requ...@lists.alioth.debian.org
