OpenPrinting / OpenPrinting/ipp-usb

cant discover older HP OfficeJets at printer boot

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Dominant language
Go
Stars
209
Forks
33
PR merge metrics
No merged PRs in 30d

Description

As ipp-usb got the Ubuntu default, we now utilise it instead of hplip. There quite some HP OfficeJet printers around with different series, where of the following I could reproduce the error:
HP OfficeJet Pro 8710
HP OfficeJet Pro 8730

There are no more models I can test but maybe there are more models poping up in the wild.
Newer models like the HP OfficeJet Pro 9010 are unaffected by this (at least I tested this model without the following problem).

The error occurs if the printer was powered off quite a time (think at least a day, tested it today after the weekend) and gets started after Linux is already up. After the printer successfully started, it wouldnt be detected by the system. After a printer restart, replugging of the usb cable or a simple restart the ipp-usb daemon, it will work. Trying the same scenario again, it works at the first printer start.

I could solve the problem by adding the following quirk:

[HP OfficeJet Pro 8710]
  init-reset = soft

Logs:

error was the first start, success the second which worked ...

03f0-7a12-HP-OfficeJet-Pro-8730_error.log
03f0-7a12-HP-OfficeJet-Pro-8730_success.log
03f0-7c12-HP-OfficeJet-Pro-8710_error.log
03f0-7c12-HP-OfficeJet-Pro-8710_success.log

tried it with the second printer of the same model we have to test with the quirk applied

03f0-7c12-HP-OfficeJet-Pro-8710_fixed.log

Looks like the problem is the following IPP response when the device is finally up:

12-02-2024 08:20:16: ! IPP: IPP: client-error-bad-request

Maybe the device isnt already initialised in this stage but dont know either.

I posted it as a ticket because it looks like a more generic problem with the HP OfficeJet series and maybe it could be solved better than the qurik I've used.

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  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the cold-boot failure with an HP OfficeJet Pro 8710 or 8730 and compare the linked error, success, and fixed logs. Then inspect how ipp-usb handles the init-reset = soft quirk and the reported IPP client-error-bad-request. Done means the affected printers are discovered after boot without requiring a restart or a model-specific workaround.

Written by the indexing model from the issue text.

Assessment

Tech stack
go, linux
Domain
backend, devtools
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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