new usb quirk: no-alt-set - won't even try set_conf or set_int_alt_set#1444
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michaelrsweet merged 4 commits intoOpenPrinting:masterfrom Dec 10, 2025
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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")
04e8:3460 Samsung Electronics Co., Ltd M337x 387x 407x Series This model print garbage after libusb_set_configuration or libusb_set_interface_alt_setting, especially when the printer has gone into sleep mode.
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Generally good, let's just remove the extra debug printfs since the important thing to know is whether we set the configuration, not that we didn't.
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michaelrsweet
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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")