For reference, they seem to reference the same line and is vanilla compared to Ubuntu-kernels: https://github.com/torvalds/linux/blob/v4.18-rc3/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c#L4784 https://github.com/torvalds/linux/blob/v4.18-rc4/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c#L4829 (According to the bug line references)