Small update: I deactivated the APU graphics in BIOS when I built my PC some years ago. After activating and starting up Ubuntu 18.04 it appeared as an OpenCL device.
clinfo shows 2 devices now. Partial info from the GPU:
Platform Name NVIDIA CUDA
Number of devices 1
Device Name GeForce GTX 1050 Ti
Device Vendor NVIDIA Corporation
Device Vendor ID 0x10de
Device Version OpenCL 1.2 CUDA
Driver Version 396.54
Device OpenCL C Version OpenCL C 1.2
Device Type GPU
Device Topology (NV) PCI-E, 01:00.0
Device Profile FULL_PROFILE
Device Available Yes
Compiler Available Yes
Linker Available Yes
Partial info from the APU:
Platform Name Clover
Number of devices 1
Device Name AMD KAVERI (DRM 2.50.0, 4.15.0-47-generic, LLVM 7.0.0)
Device Vendor AMD
Device Vendor ID 0x1002
Device Version OpenCL 1.1 Mesa 18.2.8
Driver Version 18.2.8
Device OpenCL C Version OpenCL C 1.1
Device Type GPU
Device Profile FULL_PROFILE
Device Available Yes
Compiler Available Yes
Unfortunately, Darktable only uses the GPU. In global settings I set the option ‘multiple GPU’ without changes.
Starting with ‘darktable -d opencl’ I see the following info for the GPU:
0.102580 [opencl_init] opencl related configuration options:
0.102610 [opencl_init]
0.102619 [opencl_init] opencl: 1
0.102629 [opencl_init] opencl_library: ‘’
0.102636 [opencl_init] opencl_memory_requirement: 768
0.102643 [opencl_init] opencl_memory_headroom: 1300
0.102648 [opencl_init] opencl_device_priority: ‘/!0,//’
0.102654 [opencl_init] opencl_mandatory_timeout: 200
0.102659 [opencl_init] opencl_size_roundup: 16
0.102666 [opencl_init] opencl_async_pixelpipe: 1
0.102672 [opencl_init] opencl_synch_cache: 0
0.102680 [opencl_init] opencl_number_event_handles: 100
0.102687 [opencl_init] opencl_micro_nap: 100
0.102692 [opencl_init] opencl_use_pinned_memory: 0
0.102697 [opencl_init] opencl_use_cpu_devices: 1
0.102701 [opencl_init] opencl_avoid_atomics: 0
0.102705 [opencl_init]
0.102983 [opencl_init] found opencl runtime library ‘libOpenCL’
0.103023 [opencl_init] opencl library ‘libOpenCL’ found on your system and loaded
0.250187 [opencl_init] found 2 platforms
0.250234 [opencl_init] found 2 devices
0.250549 [opencl_init] device 0 GeForce GTX 1050 Ti' has sm_20 support. 0.250677 [opencl_init] device 0 GeForce GTX 1050 Ti’ supports image sizes of 16384 x 32768
0.250685 [opencl_init] device 0 `GeForce GTX 1050 Ti’ allows GPU memory allocations of up to 1009MB
[opencl_init] device 0: GeForce GTX 1050 Ti
GLOBAL_MEM_SIZE: 4039MB
MAX_WORK_GROUP_SIZE: 1024
MAX_WORK_ITEM_DIMENSIONS: 3
MAX_WORK_ITEM_SIZES: [ 1024 1024 64 ]
DRIVER_VERSION: 396.54
DEVICE_VERSION: OpenCL 1.2 CUDA
Later I find the following info for the APU:
0.434791 [opencl_init] discarding device 1 `AMD KAVERI (DRM 2.50.0, 4.15.0-47-generic, LLVM 7.0.0)’ due to missing image support.
0.434806 [opencl_init] OpenCL successfully initialized.
0.434815 [opencl_init] here are the internal numbers and names of OpenCL devices available to darktable:
0.434825 [opencl_init] 0 ‘GeForce GTX 1050 Ti’
0.434832 [opencl_init] FINALLY: opencl is AVAILABLE on this system.
0.434840 [opencl_init] initial status of opencl enabled flag is ON.
and later…
0.435271 [opencl_priorities] these are your device priorities:
0.435278 [opencl_priorities] image preview export thumbnail
0.435288 [opencl_priorities] 0 0 0 0
0.435297 [opencl_priorities] show if opencl use is mandatory for a given pixelpipe:
0.435302 [opencl_priorities] image preview export thumbnail
0.435312 [opencl_priorities] 0 0 0 0
Seems to be that ‘missing image support’. Any information about this?