OpenCL support bugged

[EricDHH]

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=18.04
DISTRIB_CODENAME=bionic
DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"

Handbrake 1.1.0 (x64)

System: Athlon FX, AMD Radeon RX580 with amdgpu-pro enabled, opencl installed with it

eric@athena:~$ clinfo
Number of platforms 1
  Platform Name Clover
  Platform Vendor Mesa
  Platform Version OpenCL 1.1 Mesa 18.0.5
  Platform Profile FULL_PROFILE
  Platform Extensions cl_khr_icd
  Platform Extensions function suffix MESA

  Platform Name Clover
Number of devices 1
  Device Name Radeon RX 580 Series (POLARIS10 / DRM 3.25.0 / 4.15.0-29-generic, LLVM 6.0.0)
  Device Vendor AMD
  Device Vendor ID 0x1002
  Device Version OpenCL 1.1 Mesa 18.0.5
  Driver Version 18.0.5
  Device OpenCL C Version OpenCL C 1.1

To reproduce put a video into handbrake, enable conversion and choose H.264 (x264) as output code. Fill the box upon the codec 'advanced settings' with

:opencl=1

now start the encode. Result here is plain CPU conversion and this in the handbrake log window
[19:16:59] x264 options: Unknown suboption
[19:16:59] encx264: min-keyint: 30, keyint: 300
[19:16:59] encx264: encoding at constant RF 20,000000
[19:16:59] encx264: unparsed options: =:opencl=1
x264 [info]: using SAR=1/1
x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX XOP FMA3 BMI1
x264 [warning]: OpenCL: Unable to find a compatible device
x264 [info]: profile High, level 4.0

Something look incompatible here, anyone with success available?

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: handbrake 1.1.0+ds1-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Aug 6 19:19:54 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2018-03-20 (138 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180319)
SourcePackage: handbrake
UpgradeStatus: No upgrade log present (probably fresh install)