Peter Hutterer
9aa5c97158
Graphics tablet devices comprise multiple event nodes, usually a Pen, Finger and Pad node (that's how the kernel postfixes them). Pen and Pad are labeled as ID_INPUT_TABLET but the pad doesn't actually send stylus events - it doesn't usually have BTN_TOOL_PEN, merely BTN_STYLUS. For the last several years, libwacom has set ID_INPUT_TABLET_PAD for all pad devices known to it based on vid/pid and a "* Pad" name match. That does not cover devices not in libwacom. libinput relies on ID_INPUT_TABLET_PAD to initialize the pad backend. We can't drop ID_INPUT_TABLET without breaking userspace, but we can add ID_INPUT_TABLET_PAD ourselves - where a device has BTN_0 in addition to BTN_STYLUS, let's add it as a pad. There are some devices (notably: bamboos) that use BTN_LEFT instead of BTN_0 but they are relatively rare and there's a risk of mislabeling those devices, so let's just stick with BTN_0 only.
System and Service Manager
Details
Most documentation is available on systemd's web site.
Assorted, older, general information about systemd can be found in the systemd Wiki.
Information about build requirements is provided in the README file.
Consult our NEWS file for information about what's new in the most recent systemd versions.
Please see the Hacking guide for information on how to hack on systemd and test your modifications.
Please see our Contribution Guidelines for more information about filing GitHub Issues and posting GitHub Pull Requests.
When preparing patches for systemd, please follow our Coding Style Guidelines.
If you are looking for support, please contact our mailing list or join our IRC channel.
Stable branches with backported patches are available in the stable repo.