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Applies to an unreleased Debian version

Panfrost and Lima are only included in Debian 11 and newer, which is currently unreleased. All information here is tentative, and is subject to change as Debian 11 is developed.

Detailed information on Mali GPUs, and instructions on installing the proprietary drivers, can be found on the MaliGraphics page. This page is dedicated to documenting the new open-source Panfrost and Lima drivers introduced in Debian 11, including any tweaks and issue workarounds.

The free and open-source Panfrost and Lima drivers for Mali GPUs are part of Mesa and are fully free software. Compared to the proprietary drivers, they have much better stability and software compatibility and are recommended for the average user.

The Lima driver provides support for the older "Utgard" Mali GPUs, while Panfrost provides support for the newer Midgard and Bifrost GPUs. Valhall support is pending.

Hardware support

Debian 11 comes with Mesa 20.1 which supports the Mali 400 and 450 GPUs via the Lima driver, and Mali Gxx/T6xx/T7xx/T8xx GPUs via the Panfrost driver. This will cover most modern ARM SoCs, including those found in the Pinebook and Pinebook Pro devices.

In terms of specifically supported SoCs, anything using an RK3288, RK3399, S912, Exynos 7580, MT6735, or MT6753 chip should certainly work without any issues. But as long as your GPU isn't too particularly new or old (Midgard and Bifrost being the most comprehensively supported revisions), you should expect it to function.


Software support

Most of the hardware in question theoretically supports OpenGL ES 3.0, Vulkan 1.1, and OpenGL 4.6. In reality, the drivers have mainly targeted and optimized for OpenGL 2.1 and OpenGL ES 2.0 so far.

OpenGL ES 3.0 is experimentally available but may have worse performance than OpenGL ES 2.0 and may not support the full specification, leading to strange rendering issues in applications expecting certain features to be available. See the "Configuration" section below for instructions on how to use it.


Which driver should I use?

Between the Panfrost/Lima driver and the binary drivers also packaged in Debian, the Panfrost/Lima driver is almost always recommended. However, incomplete support for OpenGL ES 3.0 and nonexistent support for Vulkan may be a concern for some use-cases. Some workloads may also see better performance with the binary driver, though successive Mesa versions are closing this gap and even demonstrating better performance than the binary driver in Panfrost/Lima with many workloads.

Experimentation is recommended if you're in a performance or compatibility-critical environment, however average desktop users should stick with the Panfrost/Lima drivers to see the best stability.


Installation

Both the Panfrost and Lima drivers are included in Mesa and should work out-of-the-box after installing the relevant packages (which are, in practice, libglx-mesa0 and libgl1-mesa-dri).

For OpenCL support, you'll need to also install the mesa-opencl-icd package. Install the mesa-va-drivers and mesa-vdpau-drivers packages for hardware video acceleration.


Configuration

In the version of Mesa that comes with Debian 11 (Mesa 20.1), Panfrost supports OpenGL 2.1 and OpenGL ES 2.0 without any further tweaks necessary. Support for OpenGL ES 3.0 is available albeit unfinished, and does require a tweak to enable.

Set the PAN_MESA_DEBUG environment variable to gles3. This can be done temporarily for a given terminal session by running

export PAN_MESA_DEBUG=gles3

Or by prefixing a single command with it in order to apply it just for that application, as with:

PAN_MESA_DEBUG=gles3 supertuxkart

To set it persistently across your whole system, you can edit the /etc/environment file and, on a new line, add the text then reboot your PC:

PAN_MESA_DEBUG="gles3"


See also

Mesa

MaliGraphics

The Lima project page - https://gitlab.freedesktop.org/lima/

The Panfrost project page - https://panfrost.freedesktop.org/


CategoryHardware CategoryVideo