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Now that DC supports external DP bridge encoders, it has reached feature parity with the legacy non-DC display driver on CIK APUs: Kaveri, Kabini, Mullins. Use the DC display driver by default on SI APUs, unless it is explicitly disabled using the amdgpu.dc=0 module parameter. DC brings proper support for DP/HDMI audio, DP MST, VRR, 10-bit colors, some HDR features, atomic modesetting, etc. Signed-off-by: Timur Kristóf <timur.kristof@gmail.com> Reviewed-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>