Enable support for using drm for vsync

Packages describing “drm” as local USE flag

Package “drm” Flag Description
x11-misc/picom Enable support for using drm for vsync
dev-libs/efl Enable DRM engine
app-misc/ddcutil Use x11-libs/libdrm for more verbose diagnostics.
dev-libs/weston Enable drm compositor support
x11-misc/compton Enable VSync with DRM_IOCTL_WAIT_VBLANK
media-video/libva-utils Enables VA/DRM API support.
media-plugins/gst-plugins-vaapi Enable DRM renderer
media-video/mpv Enable Kernel Mode Setting / Direct Rendering Manager based video output
sys-apps/kmscon Enable Linux DRM for backend
net-misc/tigervnc Build with DRM support
x11-libs/libva Enables VA/DRM API support.
x11-libs/libva-compat Enables VA/DRM API support.

All packages providing a “drm” USE flag (3)