[Bug 1695884] Re: usb probing malforms Epson TM-T70 label printer output

[Dariusz Gadomski]

Till,
The printer in question is was used completely *outside* CUPS - via the /dev/usb/lp* nodes only. Although there was also an attempt with using it with a raw queue - with the same result: whenever CUPS was enabled or the printer was not blacklisted the output from the printer was malformed.

My understanding is that something that CUPS libusb backend was doing in
the 'probing' phase (backends/usb-libusb.c find_device()) is influencing
the printer configuration and changing it's settings set by control
characters.

Attaching the lsusb portion related to the printer in question.


** Attachment added: "lsusb-out.txt"
   https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1695884/+attachment/4889973/+files/lsusb-out.txt

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Title:
  usb probing malforms Epson TM-T70 label printer output

Status in cups package in Ubuntu:
  Incomplete

Bug description:
  CUPS USB probing malforms Epson TM-T70 (vendorid: 0x04b8 productid:
  0x0202) which is used outside CUPS (via usblp driver).

  No matter whether the printer is set up as a CUPS raw printer or it's
  not used via CUPS (but rather via a device node under usblp control)
  the formatting is broken on the printed out labels: the orientation is
  different from what had been set, the fonts differ.

  After blacklisting the printer in the quirks file all the problems
  were gone.

  My assumption is that this printer should be blacklisted by default.

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