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44 lines
1.8 KiB
ReStructuredText
44 lines
1.8 KiB
ReStructuredText
.. _tablet-debugging:
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==============================================================================
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Debugging tablet issues
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==============================================================================
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.. _tablet-capabilities:
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------------------------------------------------------------------------------
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Required tablet capabilities
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------------------------------------------------------------------------------
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To handle a tablet correctly, libinput requires a set of capabilities
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on the device. When these capabilities are missing, libinput ignores the
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device and prints an error to the log. This error messages reads
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::
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missing tablet capabilities: xy pen btn-stylus resolution. Ignoring this device.
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or in older versions of libinput simply:
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::
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libinput bug: device does not meet tablet criteria. Ignoring this device.
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When a tablet is rejected, it is usually possible to verify the issue with
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the ``libinput record`` tool.
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- **xy** indicates that the tablet is missing the ``ABS_X`` and/or ``ABS_Y``
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axis. This indicates that the device is mislabelled and the udev tag
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``ID_INPUT_TABLET`` is applied to a device that is not a tablet.
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A bug should be filed against `systemd <http://github.com/systemd/systemd>`__.
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- **pen** or **btn-stylus** indicates that the tablet does not have the
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``BTN_TOOL_PEN`` or ``BTN_STYLUS`` bit set. libinput requires either or both
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of them to be present. This indicates a bug in the kernel driver
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or the HID descriptors of the device.
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- **resolution** indicates that the device does not have a resolution set
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for the x and y axes. This can be fixed with a hwdb entry, locate and read
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the `60-evdev.hwdb
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<https://github.com/systemd/systemd/tree/master/hwdb/60-evdev.hwdb>`__ file
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on your machine and file a pull request with the fixes against
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`systemd <https://github.com/systemd/systemd/>`__.
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