--- files/patch-src_intel_vulkan_anv__gem.c	(revision 527733)
+++ files/patch-src_intel_vulkan_anv__gem.c	(working copy)
@@ -1,6 +1,6 @@ 
 - Define ETIME if missing
 
---- src/intel/vulkan/anv_gem.c.orig	2017-10-23 13:21:18 UTC
+--- src/intel/vulkan/anv_gem.c.orig	2019-01-17 11:26:23 UTC
 +++ src/intel/vulkan/anv_gem.c
 @@ -26,6 +26,9 @@
  #include <sys/mman.h>
@@ -12,3 +12,25 @@ 
  #include <unistd.h>
  #include <fcntl.h>
  
+@@ -116,9 +119,19 @@ anv_gem_userptr(struct anv_device *device, void *mem, 
+       .flags = 0,
+    };
+ 
+-   int ret = anv_ioctl(device->fd, DRM_IOCTL_I915_GEM_USERPTR, &userptr);
+-   if (ret == -1)
++   int ret;
++retry:
++   ret = anv_ioctl(device->fd, DRM_IOCTL_I915_GEM_USERPTR, &userptr);
++   if (ret == -1) {
++      if (errno == ENODEV && userptr.flags == 0) {
++         userptr.flags = I915_USERPTR_UNSYNCHRONIZED;
++         goto retry;
++      }
++      if (geteuid() != 0) {
++	      fprintf(stderr, "%s", "ioctl(I915_GEM_USERPTR) failed. Try running as root but expect poor stability.\n");
++      }
+       return 0;
++   }
+ 
+    return userptr.handle;
+ }