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To test a Linux V4L2 driver, run v4l2-compliance; use vivid to exercise applications against a configurable virtual video device and vimc to test a linked media pipeline. For Consumer Electronics Control (CEC) drivers, use cec-compliance. These tests cover different parts of the media subsystem, and virtual devices do not establish how real hardware performs.
Which Linux media test should you use?
Choose the tool according to what you need to verify. The kernel’s Media Subsystem Profile lists the compliance utilities expected for upstream work and says the tests should pass before patches go upstream.
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| Testing need | Tool or driver | What it addresses |
|---|---|---|
| V4L2 driver API conformance | v4l2-compliance |
Checks a V4L2 device’s adherence to the API; can also check media-controller topology. |
| Applications against a configurable virtual video device | vivid |
Exercises supported video device behavior and options without special hardware. |
| Linked media-pipeline configuration and streaming | vimc |
Models a capture device and connected sensor and processing subdevices. |
| CEC driver compliance | cec-compliance |
Tests CEC drivers; it is distinct from V4L2 compliance. |
test-media is also named in the maintainer checklist for testing V4L2 virtual drivers. These tools are complementary: a virtual device helps exercise software behavior, while compliance utilities check interfaces. Neither alone proves target-device image quality or performance.
How to run V4L2 compliance and topology checks
v4l2-compliance is a userspace utility from v4l-utils. The kernel’s media debugging guide documents these commands for a media device node:
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For a detailed topology check, run
v4l2-compliance -M /dev/mediaX --verbose, replacingXwith the media device number. -
To run a full check for devices referenced in the topology, run
v4l2-compliance -m /dev/mediaX.Rank #2
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These commands address compliance and topology, not throughput, timing, sensor behavior, or image quality on a particular board. Use the device node and available options appropriate to the system and installed v4l-utils version.
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What can vivid test?
Vivid is a configurable virtual video test driver. Its emulated device types, formats, inputs, outputs, controls, and error cases let developers exercise V4L2 applications without a camera or other special hardware. It can also model a device before the intended hardware is available, provided the required behavior is among vivid’s supported options.
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Vivid provides test patterns and color controls, and supports format and crop, compose, and scale choices. The documentation describes scaling up or down by as much as four times; that is a driver capability, not a performance claim. The scaler is intentionally basic: kernel documentation says it is “very simple and low-quality.”
Webcam inputs use enumerated discrete frame sizes; those sizes do not combine with cropping, composing, or scaling. Check the chosen emulated device type and its available controls rather than assuming every vivid configuration exposes every feature.
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Compliance runs and error injection
Vivid includes error-injection controls, including Disconnect. For a compliance run, configure the module’s no_error_inj option so those controls are absent; otherwise a test that disconnects the virtual device can leave it inaccessible partway through the run. Use a separate configuration when the purpose is to test error handling, since disabling error injection removes those controls. Consult the vivid documentation for option syntax applicable to the kernel version in use.
When is vimc the better choice?
Vimc models a more complex V4L2 and Media API pipeline. Its documented default topology has a capture device connected to sensor, debayer, and scaler subdevices. This makes it useful when the code under test depends on connected entities, links, subdevice formats, or streaming through a processing chain rather than on a single virtual video node.
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Configure linked formats before streaming
Subdevice formats and dimensions need to be consistent along the links; mismatches can prevent streaming. The kernel documentation points to media-ctl and v4l2-ctl, both from v4l-utils, for inspecting and configuring the pipeline. Vimc’s documented topology is hardcoded: changing its topology requires modifying and recompiling the driver.
What virtual-driver tests cannot establish
Vivid and vimc emulate software-visible devices and pipelines; they cannot demonstrate how a physical sensor, transport link, board timing, or actual image-processing hardware behaves. Passing virtual-device tests therefore does not replace validation on the target hardware when those properties matter. Likewise, vivid’s deliberately low-quality scaler is useful for exercising behavior, not judging image quality.
The cited documentation is the Linux kernel’s rolling “latest” documentation, accessed October 7, 2026. Driver options and details can vary by kernel release, so verify version-specific behavior against the documentation and source for the kernel being tested.
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