udev-config-printer.c: don't touch libusb alt setting for Samsung MFPs #408
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When connect Samsung ProXpress M3870FD udev-configure-printer try to alter usb settings by libusb_set_interface_alt_setting, but for most Samsung devices this causes a problem: https://blog.stuffedcow.net/2011/10/samsung-linux-cups-usb-printing/ apple/cups#3965 https://github.com/OpenPrinting/cups/blob/master/backend/usb-libusb.c (search by "Samsung")
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This is only quick example for one device, I don't really know how to do it right way, because I didn't test another Samsung devices |
snejok
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new usb quirk: no-alt-set - won't even try libusb_set_configuration or libusb_set_interface_alt_setting I noticed that sometimes garbage is printed with my Samsung ProXpress M3870FD, this happens most often if the printer has gone to sleep (after 1 min by default). So if I print something 10 times, I get garbage 3-4 times. After month of investigating I found that Samsung devices don't like libusb_set_configuration or libusb_set_interface_alt_setting. My device: 04e8:3460 Samsung Electronics Co., Ltd M337x 387x 407x Series https://blog.stuffedcow.net/2011/10/samsung-linux-cups-usb-printing/ apple/cups#3965 OpenPrinting/system-config-printer#408 https://github.com/OpenPrinting/cups/blob/master/backend/usb-libusb.c (search by "Samsung")
snejok
added a commit
to snejok/cups
that referenced
this pull request
Dec 3, 2025
new usb quirk: no-alt-set - won't even try libusb_set_configuration or libusb_set_interface_alt_setting I noticed that sometimes garbage is printed with my Samsung ProXpress M3870FD, this happens most often if the printer has gone to sleep (after 1 min by default). So if I print something 10 times, I get garbage 3-4 times. After month of investigating I found that Samsung devices don't like libusb_set_configuration or libusb_set_interface_alt_setting. My device: 04e8:3460 Samsung Electronics Co., Ltd M337x 387x 407x Series https://blog.stuffedcow.net/2011/10/samsung-linux-cups-usb-printing/ apple/cups#3965 OpenPrinting/system-config-printer#408 https://github.com/OpenPrinting/cups/blob/master/backend/usb-libusb.c (search by "Samsung")
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When connect Samsung ProXpress M3870FD
udev-configure-printer try to alter usb settings by libusb_set_interface_alt_setting, but for most Samsung devices this causes a problem:
https://blog.stuffedcow.net/2011/10/samsung-linux-cups-usb-printing/
apple/cups#3965
https://github.com/OpenPrinting/cups/blob/master/backend/usb-libusb.c (search by "Samsung")