Comment # 17 on bug 1204315 from Takashi Iwai

Then maybe better to have as Kconfig dependency, e.g.

--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -69,6 +69,7 @@ config DRM_PANEL_MIPI_DBI
 config DRM_SIMPLEDRM
     tristate "Simple framebuffer driver"
     depends on DRM && MMU
+    depends on SYSFB=n
     select APERTURE_HELPERS
     select DRM_GEM_SHMEM_HELPER
     select DRM_KMS_HELPER