ls -al /usr/share/vulkan/icd.d/
returns:
total 36K -rw-r--r-- 1 root root 161 Jun 8 19:06 dzn_icd.x86_64.json -rw-r--r-- 1 root root 167 Jun 8 19:06 intel_hasvk_icd.i686.json -rw-r--r-- 1 root root 169 Jun 8 19:06 intel_hasvk_icd.x86_64.json -rw-r--r-- 1 root root 161 Jun 8 19:06 intel_icd.i686.json -rw-r--r-- 1 root root 163 Jun 8 19:06 intel_icd.x86_64.json -rw-r--r-- 1 root root 159 Jun 8 19:06 lvp_icd.i686.json -rw-r--r-- 1 root root 161 Jun 8 19:06 lvp_icd.x86_64.json -rw-r--r-- 1 root root 162 Jun 8 19:06 radeon_icd.i686.json -rw-r--r-- 1 root root 164 Jun 8 19:06 radeon_icd.x86_64.json
NOTE: The Vulkan driver can be set with something similar to this:
export VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/radeon_icd.x86_64.json:/usr/share/vulkan/icd.d/radeon_icd.i686.json