.. _pureos_troubleshooting_devices:

Devices
=======


.. _pureos_troubleshooting_devices_screen_flicker:

Screen flickering with Intel graphics
-------------------------------------

**Problem**

The screen is flickering on devices with Intel graphics.

**Solution**

A possible cause can be buggy Intel graphics power management.
You can try disabling it by adding the ``i915.enable_rc6=0`` boot flag.

#. To do this from a running system and make it permanent, run the following terminal command:

   .. code-block::

      EDITOR=gedit sudo -e /etc/default/grub

   Feel free to replace ``gedit`` with the editor of your choice.
   The file ``/etc/default/grub`` will be opened in ``gedit`` with administrator privileges (so be careful with the next step).

#. Locate the ``GRUB_CMDLINE_LINUX`` line
#. Change it to look like this:

   .. code-block::

      GRUB_CMDLINE_LINUX="i915.enable_rc6=0"

#. Save the file.
#. Run the following command in your terminal application:

   .. code-block:: bash

      sudo update-grub

#. Restart for this to take effect.


.. _pureos_troubleshooting_devices_hplip:

HP printer not working after upgrade
------------------------------------

**Problem**

After upgrading from PureOS 9 to PureOS 10, an HP printer does not work despite being recognized properly.

**Solution**

It has been reported that removing ``ipp-usb`` is a workaround for this problem.
Run this command:

.. code-block:: bash

   sudo apt remove ipp-usb && sudo apt install hplip-gui