diff --git a/drm.c b/drm.c
index b4facfc..71ce110 100644
--- a/drm.c
+++ b/drm.c
@@ -5,6 +5,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <sys/ioctl.h>
+#include <libdrm/drm_fourcc.h>
 
 #include "drm.h"
 #include "va.h"
@@ -114,6 +115,18 @@ void drm_cleanup() {
             drmFreeVersion(kmsvnc->drm->drm_ver);
             kmsvnc->drm->drm_ver = NULL;
         }
+        if (kmsvnc->drm->pixfmt_name) {
+            free(kmsvnc->drm->pixfmt_name);
+            kmsvnc->drm->pixfmt_name = NULL;
+        }
+        if (kmsvnc->drm->mod_vendor) {
+            free(kmsvnc->drm->mod_vendor);
+            kmsvnc->drm->mod_vendor = NULL;
+        }
+        if (kmsvnc->drm->mod_name) {
+            free(kmsvnc->drm->mod_name);
+            kmsvnc->drm->mod_name = NULL;
+        }
         if (kmsvnc->drm->plane) {
             drmModeFreePlane(kmsvnc->drm->plane);
             kmsvnc->drm->plane = NULL;
@@ -215,18 +228,21 @@ int drm_open() {
     if (!drm->mfb) {
         KMSVNC_FATAL("Failed to get framebuffer %u: %s\n", drm->plane->fb_id, strerror(errno));
     }
+    drm->pixfmt_name = drmGetFormatName(drm->mfb->pixel_format);
+    drm->mod_vendor = drmGetFormatModifierVendor(drm->mfb->modifier);
+    drm->mod_name = drmGetFormatModifierName(drm->mfb->modifier);
     printf("Template framebuffer is %u: %ux%u fourcc:%u mod:%u flags:%u\n", drm->mfb->fb_id, drm->mfb->width, drm->mfb->height, drm->mfb->pixel_format, drm->mfb->modifier, drm->mfb->flags);
     printf("handles %u %u %u %u\n", drm->mfb->handles[0], drm->mfb->handles[1], drm->mfb->handles[2], drm->mfb->handles[3]);
     printf("offsets %u %u %u %u\n", drm->mfb->offsets[0], drm->mfb->offsets[1], drm->mfb->offsets[2], drm->mfb->offsets[3]);
     printf("pitches %u %u %u %u\n", drm->mfb->pitches[0], drm->mfb->pitches[1], drm->mfb->pitches[2], drm->mfb->pitches[3]);
-    printf("format %s, modifier %s:%s\n", drmGetFormatName(drm->mfb->pixel_format), drmGetFormatModifierVendor(drm->mfb->modifier), drmGetFormatModifierName(drm->mfb->modifier));
+    printf("format %s, modifier %s:%s\n", drm->pixfmt_name, drm->mod_vendor, drm->mod_name);
 
     if (
         drm->mfb->pixel_format != KMSVNC_FOURCC_TO_INT('X', 'R', '2', '4') &&
         drm->mfb->pixel_format != KMSVNC_FOURCC_TO_INT('A', 'R', '2', '4')
     )
     {
-        KMSVNC_FATAL("Unsupported pixfmt\n");
+        KMSVNC_FATAL("Unsupported pixfmt %s, please create an issue with your pixfmt.\n", drm->pixfmt_name);
     }
 
     if (!drm->mfb->handles[0])
@@ -313,6 +329,11 @@ int drm_vendors() {
 
     if (strcmp(driver_name, "i915") == 0 || strcmp(driver_name, "amdgpu") == 0)
     {
+        if (fourcc_mod_is_vendor(drm->mfb->modifier, INTEL)) {
+            if (strstr(drm->mod_name, "CCS")) {
+                printf("warn: intel with CCS modifier detected, please set INTEL_DEBUG=noccs\n");
+            }
+        };
         drm->funcs->convert = &convert_vaapi;
         if (drm_kmsbuf_prime_vaapi()) return 1;
     }
@@ -327,6 +348,9 @@ int drm_vendors() {
              strcmp(driver_name, "virtio_gpu") == 0
     )
     {
+        if (drm->mfb->modifier != DRM_FORMAT_MOD_NONE && drm->mfb->modifier != DRM_FORMAT_MOD_LINEAR) {
+            printf("warn: modifier is not LINEAR, please create an issue with your modifier.\n");
+        }
         // virgl does not work
         if (drm_kmsbuf_dumb()) return 1;
     }
@@ -362,6 +386,9 @@ int drm_vendors() {
     else
     {
         fprintf(stderr, "Untested drm driver, use at your own risk!\n");
+        if (drm->mfb->modifier != DRM_FORMAT_MOD_NONE && drm->mfb->modifier != DRM_FORMAT_MOD_LINEAR) {
+            printf("warn: modifier is not LINEAR, please create an issue with your driver and modifier.\n");
+        }
         if (drm_kmsbuf_dumb()) return 1;
     }
 
diff --git a/kmsvnc.h b/kmsvnc.h
index 6c99368..b8b5204 100644
--- a/kmsvnc.h
+++ b/kmsvnc.h
@@ -88,6 +88,9 @@ struct kmsvnc_drm_data
     off_t mmap_offset;
     char *mapped;
     struct kmsvnc_drm_funcs *funcs;
+    char *pixfmt_name;
+    char *mod_vendor;
+    char *mod_name;
 };
 
 struct kmsvnc_va_data