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Add unidir USB quirk for Canon Pro9000 Mark II - #1817
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After a job sent with bidirectional I/O the printer accepts no further job until it is power-cycled: the backend stays at "Sending data to printer" and transfers nothing. With unidirectional I/O consecutive jobs print. Other Canon entries, among them the PIXMA iP4200, iP4300 and iP6000D, already use the same quirk.
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With the default bidirectional I/O, a Canon Pro9000 Mark II (04a9:10cf) prints one job and then accepts no further job until it is power-cycled. The next job sits at "Sending data to printer" with no state reason; when the printer was finally switched off, the backend log for that job showed
Sent 0 bytes.With
usb-unidirconsecutive jobs print without a power cycle. Other Canon entries, among them the PIXMA iP4200, iP4300 and iP6000D, already use the same quirk; the iP6000D report (Launchpad 1160638) describes a similar stall that lasts until power is cycled.Observed with CUPS 2.4.20, libusb 1.0.30, Linux, raw jobs:
Sent 0 bytesEvery job that followed a bidirectional job without a power cycle was refused (four of four); every job that followed a unidirectional job printed (three of three).
Limits: one printer. The kernel
usblpmodule's attachment also differed between some runs and was not controlled for. Tested withlp -o usb-unidir=trueandlpadmin -o usb-unidir-default=true, not with the quirk file itself, and with debug logging off, so the backend's "Forced uni-directional communication" line was not captured.