Bug 2193385

Summary:	avahi-daemon does not add network printer to CUPS
Product:	[Fedora] Fedora	Reporter:	Kirill Malgichev <kmalgich>
Component:	avahi	Assignee:	Michal Sekletar <msekleta>
Status:	CLOSED NOTABUG	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	38	CC:	msekleta, mzeuom, pemensik, rdieter, zdohnal
Target Milestone:	---	Keywords:	Desktop
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-09-05 13:03:27 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2123634
Bug Blocks:

Description Kirill Malgichev 2023-05-05 13:23:54 UTC

I have freshly installed Fedora 38 and found that Google Chrome does not show my network printer (HP ENVY 5530 printer + scanner) in the printing dialog that can be opened with the Chrome Ctrl+P shortcut or via the browser menu.

The printer was automatically found and configured by avahi-daemon. I can see it in GNOME Control Center, but there is no printer at the CUPS Web UI (http://localhost:631/printers/).

I tried to add the printer manually using the "Add printer" button in GNOME Control Center. It was added successfully to CUPS and also updated in GNOME Control Center. Now I can see the printer in the Google Chrome printing dialog, but there seem to be some driver problems since I can only print in low quality and only in black and white, even though it was different in Chrome.

The next step was to disable avahi-daemon completely and add the printer manually using the "Add printer" button in GNOME Control Center. This seemed to fix all the problems with Google Chrome printing. However, I now need to enter the root password every time I try to use the scanner with the simple-scan application. Additionally, I think I will need to reinstall the printer each time its IP address changes.

Finally, I found that the cups-browsed service was disabled. So, I removed the manually installed printer, enabled the avahi-daemon service again, and also enabled the cups-browsed service. Now I can see my network printer configured automatically in GNOME Control Center as well as in the CUPS UI. I have my printer as an option in the Google Chrome printing dialog as well, and everything works as expected.

I wonder why the cups-browsed service is disabled by default?

Reproducible: Always

Steps to Reproduce:
1. Use correctly configured network printer.
2. Check that it was added to the gnome-control-center by the avahi-daemon service
3. Check printer at CUPS UI at http://localhost:631/printers/
Actual Results:
Printer is configured at gnome-control-center and available for some GNOME apps but not added at CUPS, so it does not available for applications that relies on CUPS.

Expected Results:
Printer should be configured at both gnome-control-center and CUPS.

This is reproducible on freshly installed Fedora 38 Workstation. Enabling cups-browsed service seemed to fix the problem but this service is disabled by the default.

Comment 1 Zdenek Dohnal 2023-09-05 13:03:27 UTC

This is Google Chrome bug - the print dialog should be able to see CUPS temporary queue via cupsGetDests2() or cupsGetNamedDest() API.

In case you would like to use Chromium, it is affected as well - https://bugzilla.redhat.com/show_bug.cgi?id=2123634 .

Closing this as NOTABUG, since Google Chrome is not in official Fedora repos.