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Use a udev rule when a device event should trigger a match and action—for example, setting a permission or property, creating a stable symlink, or renaming a network interface. Use the systemd hardware database (hwdb) when a hardware identity should map to device properties. They can work together: hwdb-supplied properties may feed later device handling.
What is the difference between udev rules and hwdb?
udev rules are event-oriented. The udev daemon receives kernel device events when a device is added, removed, or changes state, then checks rules against device attributes. A rule combines match keys with assignment keys; depending on the rule and device, it can set properties, create a /dev symlink, or arrange a device action. See the systemd project’s udev(7) manual.
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hwdb is a metadata mapping: entries match hardware identifiers or patterns and attach properties to matching devices. For example, libinput documents using hardware details such as device names, DMI information, or modaliases to configure input-device properties. Local entries in that guidance go under /etc/udev/hwdb.d/. See libinput’s static device configuration guide.
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|---|---|---|
| What does it match? | Device-event attributes and other rule match criteria. | Hardware identifiers or patterns. |
| What does it change? | Can assign properties or permissions, create symlinks, and support device actions such as renaming. | Supplies properties for a matching device. |
| When is it a fit? | When the fix is an event-triggered action or assignment. | When the fix is a static hardware-to-property mapping. |
Which should you use for a device fix?
Choose a udev rule for an action
Start with a rule if you need to change what happens as udev handles a device event: set a permission or property, create a stable symlink, or apply a device name. The rule needs a reliable match. A vendor and product ID can be useful, but those values alone do not guarantee that a match identifies only the intended device.
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Choose hwdb for a property tied to hardware identity
Use hwdb when the desired change is to attach a property because the device matches a hardware identity pattern. This is appropriate when a consumer—such as an input-device configuration component—reads that property. The libinput guide illustrates this model and recommends placing local entries under /etc/udev/hwdb.d/.
Use both when a property feeds a later action
The mechanisms are not mutually exclusive. A hardware match can supply a property, and later device-handling logic can consume it. Systemd’s network naming documentation describes hwdb allowlist or denylist entries that affect which attributes naming logic considers, and notes that udev rules can rename devices based on generated properties. See systemd.net-naming-scheme(7).
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How to identify the right match
- Inspect the device first. Use
udevadm infoto examine stored device information and sysfs properties. The upstream udevadm documentation describes these queries; check the installed manual for the exact options available on your distribution. - Pick the identity fields that remain stable. Decide whether a device attribute, parent attribute, modalias, or other hardware pattern best distinguishes the target. Avoid assuming a VID/PID-only match is unique.
- Check the scope of the match. A broad pattern can affect unintended machines or devices. Conversely, libinput warns that overly specific DMI strings can cease to match after a firmware change.
- Confirm the consumer. Establish which service or application reads the property. A property that is correctly attached but never consumed will not produce the behavior you want.
Where do custom rules and hwdb entries go?
Rule files are read from system, runtime, and local configuration directories and processed in lexical order; files with the same name can replace one another. This means both the filename and directory matter when a local rule is intended to override a vendor-provided file. Consult the installed udev(7) manual for the paths and precedence rules supported by the target system.
For hwdb, the cited libinput guide and systemd network naming manual use /etc/udev/hwdb.d/ for local entries. Follow the syntax and file naming conventions documented for your distribution’s systemd release rather than assuming every release handles configuration identically.
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How to test a change and troubleshoot missing properties
- Check local command support. Run
udevadm --helpand consult the installed man pages before relying on a particular reload or test option; available commands can differ by systemd release. - Inspect the device’s current information. Use the locally documented
udevadm infoqueries to verify the identity data and properties you intend to match. - Test the configuration on the target system. For a hwdb-backed libinput property that does not appear, libinput recommends
udevadm testto help identify rule or hwdb syntax errors. Use the local manual to check the command’s accepted arguments and procedure. - Check both the match and the consumer. If a property is absent, investigate whether the pattern matched and whether the relevant rule or hwdb syntax is valid. If the property exists but the device behavior did not change, verify that the intended component consumes it.
Why systemd version matters
Upstream manuals describe particular systemd versions, and distributions may package different releases or downstream changes. The naming reference linked above is version 257; the libinput example is from version 1.10.7 of its documentation. Neither establishes a complete compatibility matrix for every distribution. Before applying an example, check the target distribution’s installed documentation for supported keys, file locations, and udevadm options.
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