Author: Sergey Zhuravlevich <zhurxx@gmail.com>
Date:   Tue Nov 20 13:17:37 CET 2018

    Check for resources when validating KMSDRM device in check_modesetting.

--- SDL2-2.0.9/src/video/kmsdrm/SDL_kmsdrmvideo.c	2018-11-20 12:30:50.575845883 +0100
+++ SDL2-2.0.9/src/video/kmsdrm/SDL_kmsdrmvideo.c	2018-11-20 12:34:14.055833946 +0100
@@ -61,8 +61,14 @@
         if (SDL_KMSDRM_LoadSymbols()) {
             drmModeRes *resources = KMSDRM_drmModeGetResources(drm_fd);
             if (resources != NULL) {
-                available = SDL_TRUE;
-                KMSDRM_drmModeFreeResources(resources);
+                SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "%scard%d connector, encoder and CRTC counts are: %d %d %d",
+                             KMSDRM_DRI_PATH, devindex,
+                             resources->count_connectors, resources->count_encoders, resources->count_crtcs);
+
+                if (resources->count_connectors > 0 && resources->count_encoders > 0 && resources->count_crtcs > 0) {
+                    available = SDL_TRUE;
+                    KMSDRM_drmModeFreeResources(resources);
+                }
             }
             SDL_KMSDRM_UnloadSymbols();
         }
@@ -358,6 +364,7 @@
         ret = SDL_OutOfMemory();
         goto cleanup;
     }
+    SDL_LogDebug(SDL_LOG_CATEGORY_VIDEO, "Opening device /dev/dri/card%d", vdata->devindex);
     SDL_snprintf(devname, 16, "/dev/dri/card%d", vdata->devindex);
     vdata->drm_fd = open(devname, O_RDWR | O_CLOEXEC);
     SDL_free(devname);