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OpenPrinting / ippusbxd

Cross-platform IPP over USB driver
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ippusbxd fails to register my device with error "No page description language info in device ID" #36

Closed tangyanli closed 4 years ago

tangyanli commented 4 years ago

Hello, The ippusbxd fails to register my device when the device is connected via USB. Because my device doesn't return correct CMD Info (device-id).

But ipp-usb works well, and the ipp-usb can get pdl info from document-format-supported which returned correctly by my device.

ThierryHFR commented 4 years ago

@tillkamppeter and @alexpevzner I'm still convinced that the problem comes from the packaging since the problem is only present on debian.

alexpevzner commented 4 years ago

@Ordissimo,

regardless of that, it makes sense to drop from the ippusbxd the old legacy code, that extracts information from the USB DeviceId, because this source of information is not very reliable, and rely on IPP printer attributes, as ipp-usb does.

IPP printer attributes are always reliable, because without them IPP printing will not work

ThierryHFR commented 4 years ago

@alexpevzner , It's partially done, in fact we could use that mechanism

tangyanli commented 4 years ago

@Ordissimo I am sorry that I didn’t give a clear comment. This issue is found when I test another device. And it also happens on ubuntu.

tillkamppeter commented 4 years ago

Yes, the USB-Device-ID-based code for finding device capabilities can be removed. IPP/eSCL is much more reliable.

ThierryHFR commented 4 years ago

@tillkamppeter The usb is no longer used for registrations that are based on IPP and eSCL.

tillkamppeter commented 4 years ago

Accepted pull request #37, thanks, @Ordissimo.