+Cc: Greg, Felipe and Takashi. I hope they would point you to a right direction. On Sun, Oct 1, 2017 at 9:07 PM, Владимир Мартьянов <vilgeforce@xxxxxxxxx> wrote: > Hello! > > I just bought MIDI keyboard WORLDE MINI (looks like full chinese clone > af Arturia Minilab with the same vid:pid) and it won't work in Linux. > When the device is connected, it resets again and again. There are > some threads on the internet about the same issue, but there is no > solution. > > The problem is in the device: it has iConfiguration=3 in the > Configuration Descriptor, but when this string is requested from the > device it just resets. The Linux requested this string when the device > is connected, so it can't work at all. I tested it by requesting the > string with ID=3 and the device resets. > > I patched drivers/usb/core/message.c by commenting call to : > if (cp->string == NULL && > !(dev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS)) > cp->string = usb_cache_string(dev, cp->desc.iConfiguration); > and the problem gone. > > Should the Linux kernel concern about such buggy devices? If it > should, what's the best way to bypass the problem? > -- > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- With Best Regards, Andy Shevchenko -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
