I have an Intel NUC Core i7 with Iris 6100 graphics (NUC5i7RYH), and I have installed Ubuntu 15.04.  Here's the "uname -a" string:

  > Linux yorktown 3.19.0-22-generic #22-Ubuntu SMP Tue Jun 16 17:15:15 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

I built and tested Beignet latest master (834d0ae), and it wouldn't run any unit tests, failing with the following output:

  > platform number 1
  > platform_profile "FULL_PROFILE"
  > platform_name "Intel Gen OCL Driver"
  > platform_vendor "Intel"
  > platform_version "OpenCL 1.2 beignet 1.1 (git-834d0ae)"
  > platform_extensions "cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_byte_addressable_store cl_khr_spir cl_khr_icd"
  > cl_get_gt_device(): error, unknown device: 162b
  > error calling clGetDeviceIDs
  > Failed to initialize cl device.
  > 
  > summary:
  > ----------
  >   total: 762
  >   run: 0
  >   pass: 0
  >   fail: 0
  >   pass rate: 0.000000