gdbserver-igfx "failed to initialize"

Hello,

I'm trying to use OpenCL™ Kernel Debugger as explained here: https://software.intel.com/en-us/node/671873
I have a target as follow:

• Ubuntu 16.04LTS
• Intel Celeron J3160
• Intel® SDK for OpenCL™ Applications 2016 R3
• Intel driver for OpenCL - intel-opencl-xxx-r3.0-57406.x86_64
• intel graphic driver i915 v 4.7.0.intel.r3.0

My problem:
When I use following command:
/usr/bin/gdbserver-igfx :1234 --attach 123

I get error "Failed to initialize"

I tried several things like adding the HOST IP address, starting the program first to put a real PID, ... But nothing worked.

Please Help !