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The drm feature solves the problem of creating a common entry point for adding kernel drm modules for different package lists. The need for allocation into a separate feature arose from one parties to the need to make a switch between free and proprietary NVIDIA driver, on the other, because of the need to add only drm modules kernels for purposes such as use/stage2/kms and use/plymouth. Also no more switch needed for RADEON, as only the free video driver remains.
Эта фича предназначена для добавления поддержки plymouth -- современной реализации bootsplash. Плотно взаимодействует с фичей branding по объективным причинам, но оформлена отдельно для возможности собирать образы с частичным брендированием либо "без излишеств".