Re: Duplex Printer Problem

[Jonathan Ryshpan <jonrysh@xxxxxxxxxxx>]

On Tue, 2022-09-06 at 12:36 +0200, Klaus-Peter Schrage wrote:

FWIW, hp-check gives me just the same errors about missing dependencies

(some details in the log are different because my device HP Color

LaserJet MFP M277dw includes scanning). So these messages are probably

useless in your case - as far as I understand it, those dependencies are

essential if you want to BUILD the hp libraries.

This looks very reasonable, except for the message

 error: 'cups' package is missing or 'cups' service is not running.

Cups certainly seems to be running on my system

$ systemctl status cups.service  
● cups.service - CUPS Scheduler
    Loaded: loaded (/usr/lib/systemd/system/cups.service; disabled; vendor preset: disabled)
    Active: active (running) since Tue 2022-09-06 19:08:56 PDT; 15min ago

Very mysterious...

Interesting enough, hp-toolbox tells me that no hp devices can be found,

although I definitely can use my printer/scanner. I found that my

printer uses "driverless printing" through "IPP Everywhere". So you

might investigate further in this direction:

https://docs.fedoraproject.org/en-US/quick-docs/cups-useful-tricks/

hp-toolbox finds my printer without any trouble, not in the console message but in the GUI.

It's not clear what cups-useful-tricks is about; there seems to be unstated context. In any case the HP-M255dw is not capable of driverless operation:

$ sudo lsusb -v

...

Bus 003 Device 004: ID 03f0:0a70 HP, Inc HP ColorLaserJet M255-M256
Device Descriptor:

...

     bInterfaceClass         7 Printer
     bInterfaceSubClass      1 Printer
     bInterfaceProtocol      2 Bidirectional

The web page indicates that bInterfaceProtocol must be 4 for the printer to be capable of driverless operation. So it looks like the document is not relevant to my situation. However I did install ipp-usb (and reboot), however without any apparent result.

-- 

Sincerely Jonathan Ryshpan <jonrysh@xxxxxxxxxxx>

	Procrastinators do it later.

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