System Info - System: Ubuntu 18.04 - Linux Kernel Version: I tried 4.15 through 4.17 (both custom and standard repo kernels) - Nvidia Driver: 396 - Graphics Card (GPU): Nvidia GeForce 1080 - CPU: i7-8700K (Coffeelake) - Cuda Version: 9.1 - ocl-icd-libopencl1 Version: 2.2.11-1ubuntu1 - ocl-icd-libopencl1 Provides: libopencl-1.1-1, libopencl-1.2-1, libopencl-2.0-1, libopencl-2.1-1, libopencl1 - clinfo Output: Number of platforms 1 Platform Name Clover Platform Vendor Mesa Platform Version OpenCL 1.1 Mesa 18.1.1 Platform Profile FULL_PROFILE Platform Extensions cl_khr_icd Platform Extensions function suffix MESA Platform Name Clover Number of devices 0 NULL platform behavior clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...) Clover clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...) Clover clCreateContext(NULL, ...) [default] No devices found in platform clCreateContextFromType(NULL, CL_DEVICE_TYPE_DEFAULT) No devices found in platform clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU) No devices found in platform clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU) No devices found in platform clCreateContextFromType(NULL, CL_DEVICE_TYPE_ACCELERATOR) No devices found in platform clCreateContextFromType(NULL, CL_DEVICE_TYPE_CUSTOM) No devices found in platform clCreateContextFromType(NULL, CL_DEVICE_TYPE_ALL) No devices found in platform ICD loader properties ICD loader Name OpenCL ICD Loader ICD loader Vendor OCL Icd free software ICD loader Version 2.2.11 ICD loader Profile OpenCL 2.1
I have been using OpenGL and OpenCL successfully for quite some time. However, I have not been able to use OpenCL recently. I update my system monthly. I used OpenCL successfully in May. As for June, I did not use OpenCL until the second week of June. I assume an update that I got in the beginning of June is the cause (but I could be wrong). I have tried downgrading the Linux kernel (and trying various kernel versions), Nvidia drivers (390 and 396), and various graphics-related libraries without success. The output of clinfo no longer sees my Nvidia card (like it did in May).
I have tried reinstalling nvidia-cuda-toolkit as well as all other Nvidia and Cuda packages. I also tried reinstalling intel-microcode and all Optimus/Prime related packages. I also tried uninstalling such packages and reinstalling. I have also tried uninstalling all intel-iGPU (such as Beignet and intel-microcode) related packages. The ubuntu-additional-drivers program only ever shows the Nvidia driver.
Interestingly, OpenGL is perfectly fine. I can still use the Nvidia card for graphics rendering. The output of nvidia-smi shows my various processes running on the graphics card in graphics-mode (but no compute-mode processes).
What am I over-looking in getting OpenCL to work again?
This detail may or may not be related or provide a hint, but the output of eglinfo shows that dlopen cannot find vgem_dri.so.