Index: backend/usb-libusb.c
===================================================================
--- backend/usb-libusb.c	(revision 9570)
+++ backend/usb-libusb.c	(working copy)
@@ -411,7 +411,7 @@
 
   if (usb_control_msg(printer->handle,
                       USB_TYPE_CLASS | USB_ENDPOINT_IN | USB_RECIP_INTERFACE,
-		      0, printer->conf, printer->iface,
+		      0, printer->conf, (printer->iface << 8) | printer->altset,
 		      buffer, bufsize, 5000) < 0)
   {
     *buffer = '\0';
@@ -675,6 +675,7 @@
     goto error;
   }
 
+#if 0 /* STR #3801: Claiming interface 0 causes problems with some printers */
   if (number != 0)
     while (usb_claim_interface(printer->handle, 0) < 0)
     {
@@ -685,6 +686,7 @@
 
       goto error;
     }
+#endif /* 0 */
 
  /*
   * Set alternate setting...