Direct Rendering Management
The Direct Rendering Manager (DRM) is a subsystem of the Linux kernel responsible for interfacing with the GPUs of modern video cards.
It is a requirement for the more modern UI, notably Phosh, Plasma Mobile or Sway.
In postmarketOS, DRM support is often only available in a (near to) mainline kernel.
Useful Links
- the DRI Wiki on freedesktop
- the Wikipedia page