HPLIP

HPLIP (HP Linux Imaging and Printing) provides printer drivers for HP devices. It also includes scanner, fax support as well as service tools for various multi-purpose peripherals.

Do you require HPLIP?
Using HPLIP is recommended for most HP inkjet or laserjet based printers. There may however be devices which work with a default CUPS install, which provides adequate drivers or PPD files.

For some devices the driver is needed because a binary plugin which is installed with the driver is required to be able to use all features of the device (i. e. printing or scanning is not possible without the plugin), to achieve a better printing quality or to speed up printing. See the binary plugins section for more information.

Installation
For printing support, it is recommended to use the new hpcups driver, which you can enable with the hpcups USE flag. The old hpijs driver is still included when you build HPLIP with the hpijs USE flag.

The default install enables dynamically generated ppd files at runtime. Some printers may still require static ppd files. If you encounter problems when using hp-setup try enabling the static-ppds USE flag and rebuild HPLIP.

For USB printers has to be built with the usb USE flag. This way it makes use of the user space tool which replaces kernel usb printer support (CONFIG_USB_PRINTER). In case of problems you can disable the usb USE flag for and activate the kernel functionality again. All users who need to access the printer have to be a member of the lp group.

To be able to set up a network printer has to be built with USE avahi or slp. The 1.6 series of has dropped slp support and one can choose to build it with USE avahi or zeroconf. To be able to print on a network printer HPLIP needs to be built with USE snmp.

For some scanner devices the appropriate sane backend needs to be activated. To find out which backend is required for your device go to the sane projects driver search engine and search for 'HEWLETT-PACKARD' as manufacturer. This provides a list of all supported devices including the required backend. For instance if the device needs the hp backend the following must be added to the portage configuration to build it when installing :

Kernel
USB port connected devices require basic kernel USB support. When using the old kernel USB printer driver which means not using the usb USE flag the following kernel options must be set:

If preferred this driver can be enabled as module which will be called usblp. This also makes testing the usb USE flag easier as one can simple switch between both methods by either disabling the USE flag and load the kernel module or enable the USE flag and unload the kernel module via modprobe. This saves kernel recompilations and machine restarts and only HPLIP needs to be recompiled for the USE flags changes to take effect. If the module should permanently disabled it can be blacklisted to prevent automatic loading at boot time.

Load the usblp kernel module:

Unload the usblp kernel module:

Blacklist the usblp kernel module:

Parallel port connected devices require the following kernel options:

The above two methods are usually already enabled within most kernels.

Network connected devices do not require special kernel drivers but basic kernel network support.

Software
Install :

Printers and Faxes
If installed with enabled qt4 USE flag, use the "HP Device Manager" to configure your devices.

Alternatively you can run hp-setup in a terminal:

For network printer also specify the printer's IP address:

Afterwards you should restart the cups daemon:

Scanners
Overall, scanners should just work and will be detected with XSane etc.

Printer
After completing hp-setup you should be provided with the option of printing a test page. You can do this later using the "HP Device Manager" or the CUPS web interface which is located at http://localhost:631/.

Scanner
Use xsane and then press the preview button to ensure the scanner driver is installed and working properly.

Upgrading
Every time when upgrading HPLIP run hp-setup -r to remove all printers and configure them again as described above in the configuration section.

Binary plugins
There are some devices which require a binary plugin to use all functions the device provides. A list with devices requiring the binary plugin including the reasons why it is needed is available at the project's homepage. Gentoo currently does not support the binary plugin. hp-setup however tries to automatically install the plugin. The installed files are out of portage's control and are located under  and. For installing just the plugin without configuring printer queues hp-plugin is available. If installing the plugin fails with hp-setup or hp-plugin the plugin installer is available for download here. To install the plugin the downloaded *.run file has to executed in a shell:

Afterwards follow the instructions of the installer similar to hp-setup or hp-plugin

/usr/libexec/cups/backend/hp failed
Edit this and remove the lines prefixed with "State", "Reason" and "Type".

Upon saving the file and restarting the cupsd daemon, printing should resume.

Error on install "File "./plugin_install.py", line 78 except ImportError, e:"
PROBLEM: A snipping of the error follows.

SOLUTION: Python 3 is set as main python interpreter. HPLP currently does not work correct with python 3. Switching back to python 2 by using eselect python fixes this.

This is further documented at the

HPLIP ebuild Upgrades Do Not Upgrade Binary Plugin(s)
PROBLEM: The HPLIP ebuild itself does not upgrade the binary plugin(s) when the ebuild is upgraded. A symptom of this problem, you may get segfaults when starting XSane. (i.e. The HP LaserJet M1522nf requires a binary plugin for using the scanning feature.)

SOLUTION: Following the upgrade instructions should take care of this as hp-setup tries to upgrade the plugin.

Printing Weird Characters
PROBLEM: The printout contains weird looking characters.

SOLUTION: The printer likely can not handle Postscript Level 3 output. To work around, the printer's PPD file needs to be edited by replacing '*LanguageLevel: "3"' with '*LanguageLevel: "2"'.

See which was initially opened in the year 2008 and  for more information.

External resources
HPLIP at launchpad Lauchpad bug tracker Launchpad answers Troubleshooting section of the HPLIP knowledge database.