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#1 2025-10-11 10:24:53
- pierric
- Member
- Registered: 2021-04-12
- Posts: 14
opencl, darktable and nvidia gtx 960
Hi,
I've seen a few threads about opencl and darktable, but they didn't help me. I have an nvidia GTX 960 card, using the nvidia drivers. Darktable does not see any valid openCL implementation. I've looked at https://wiki.archlinux.org/title/GPGPU and a number of other pages, but still no success
What's installed:
- official nvidia drivers
- opencl-nvidia (seems to be useless) and cuda
- opencl-mesa
- ocl-icd and ocl-icd-choose
Some output now.
[I] pierric@arch ~> ls /etc/OpenCL/vendors/
nvidia.icd rusticl.icd[I] pierric@arch ~> clinfo
pci id for fd 5: 10de:1401, driver (null)
pci id for fd 5: 10de:1401, driver (null)
Number of platforms 1
Platform Name rusticl
Platform Vendor Mesa/X.org
Platform Version OpenCL 3.0
Platform Profile FULL_PROFILE
Platform Extensions cl_khr_icd
Platform Extensions with Version cl_khr_icd 0x800000 (2.0.0)
Platform Numeric Version 0xc00000 (3.0.0)
Platform Extensions function suffix MESA
Platform Host timer resolution 1ns
Platform Name rusticl
Number of devices 0
NULL platform behavior
clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...) No platform
clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...) No platform
clCreateContext(NULL, ...) [default] No platform
clCreateContext(NULL, ...) [other] <error: no devices in non-default plaforms>
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[I] pierric@arch ~> darktable -d opencl
darktable 5.2.1
Copyright (C) 2012-2025 Johannes Hanika and other contributors.
Compile options:
Bit depth -> 64 bit
Exiv2 -> 0.28.7
Lensfun -> 0.3.4
Debug -> DISABLED
SSE2 optimizations -> ENABLED
OpenMP -> ENABLED
OpenCL -> ENABLED
Lua -> ENABLED - API version 9.5.0
Colord -> ENABLED
gPhoto2 -> ENABLED
OSMGpsMap -> ENABLED - map view is available
GMIC -> ENABLED - Compressed LUTs are supported
GraphicsMagick -> ENABLED
ImageMagick -> DISABLED
libavif -> ENABLED
libheif -> ENABLED
libjxl -> ENABLED
LibRaw -> ENABLED - Version 0.22.0-Devel202502
OpenJPEG -> ENABLED
OpenEXR -> ENABLED
WebP -> ENABLED
See https://www.darktable.org/resources/ for detailed documentation.
See https://github.com/darktable-org/darktable/issues/new/choose to report bugs.
0.0001 [dt starting]
darktable -d opencl
0.3100 [opencl_init] opencl disabled via darktable preferences
0.3102 [opencl_init] opencl library 'libOpenCL' found on your system and loaded, preference 'default path'
pci id for fd 24: 10de:1401, driver (null)
pci id for fd 24: 10de:1401, driver (null)
0.3889 [opencl_init] found 1 platform
0.3889 [check platform] platform 'rusticl' with key 'clplatform_rusticl' is NOT active
[opencl_init] found 0 device
0.3889 [opencl_init] FINALLY: opencl PREFERENCE=OFF is NOT AVAILABLE and NOT ENABLED.
2.4326 [lib_load_module] failed to open `midi': libportmidi.so.2: cannot open shared object file: No such file or directory[I] pierric@arch ~> sudo lspci -kv -s 01:00.0
01:00.0 VGA compatible controller: NVIDIA Corporation GM206 [GeForce GTX 960] (rev a1) (prog-if 00 [VGA controller])
Subsystem: Gigabyte Technology Co., Ltd Device 36c1
Flags: bus master, fast devsel, latency 0, IRQ 127
Memory at a2000000 (32-bit, non-prefetchable) [size=16M]
Memory at 90000000 (64-bit, prefetchable) [size=256M]
Memory at a0000000 (64-bit, prefetchable) [size=32M]
I/O ports at 4000 [size=128]
Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
Capabilities: [60] Power Management version 3
Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [78] Express Legacy Endpoint, IntMsgNum 0
Capabilities: [100] Virtual Channel
Capabilities: [258] L1 PM Substates
Capabilities: [128] Power Budgeting <?>
Capabilities: [420] Advanced Error Reporting
Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
Capabilities: [900] Secondary PCI Express
Kernel driver in use: nvidia
lspci: Unable to load libkmod resources: error -2What's my next move?
Thanks!
Pierric.
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#2 2025-10-11 10:42:14
- Lone_Wolf
- Administrator
- From: Netherlands, Europe
- Registered: 2005-10-04
- Posts: 14,315
Re: opencl, darktable and nvidia gtx 960
Try removing ocl-icd-choose and rerun clinfo .
Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.
clean chroot building not flexible enough ?
Try clean chroot manager by graysky
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#3 2025-10-11 13:16:26
- pierric
- Member
- Registered: 2021-04-12
- Posts: 14
Re: opencl, darktable and nvidia gtx 960
Ok, I feel stupid. It must have to do with the order I tried things in, though according to my history I installed things in this order, and at each step it was still failing in one way or another:
- opencl-nvidia
- cuda
- ocl-icd
- opencl-mesa
- ocl-icd-choose
I now removed ocl-icd-choose as suggested, and not only is the output of clinfo much longer, darktable now detected opencl and it just works.
For reference, clinfo output as requested. But as said, it now seems to work anyway.
pci id for fd 10: 10de:1401, driver (null)
pci id for fd 10: 10de:1401, driver (null)
Number of platforms 2
Platform Name NVIDIA CUDA
Platform Vendor NVIDIA Corporation
Platform Version OpenCL 3.0 CUDA 13.0.94
Platform Profile FULL_PROFILE
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_fp64 cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_copy_opts cl_nv_create_buffer cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_device_uuid cl_khr_pci_bus_info cl_khr_external_semaphore cl_khr_external_memory cl_khr_external_semaphore_opaque_fd cl_khr_external_memory_opaque_fd cl_khr_semaphore
Platform Extensions with Version cl_khr_global_int32_base_atomics 0x400000 (1.0.0)
cl_khr_global_int32_extended_atomics 0x400000 (1.0.0)
cl_khr_local_int32_base_atomics 0x400000 (1.0.0)
cl_khr_local_int32_extended_atomics 0x400000 (1.0.0)
cl_khr_fp64 0x400000 (1.0.0)
cl_khr_3d_image_writes 0x400000 (1.0.0)
cl_khr_byte_addressable_store 0x400000 (1.0.0)
cl_khr_icd 0x400000 (1.0.0)
cl_khr_gl_sharing 0x400000 (1.0.0)
cl_nv_compiler_options 0x400000 (1.0.0)
cl_nv_device_attribute_query 0x400000 (1.0.0)
cl_nv_pragma_unroll 0x400000 (1.0.0)
cl_nv_copy_opts 0x400000 (1.0.0)
cl_nv_create_buffer 0x400000 (1.0.0)
cl_khr_int64_base_atomics 0x400000 (1.0.0)
cl_khr_int64_extended_atomics 0x400000 (1.0.0)
cl_khr_device_uuid 0x400000 (1.0.0)
cl_khr_pci_bus_info 0x400000 (1.0.0)
cl_khr_external_semaphore 0x400000 (1.0.0)
cl_khr_external_memory 0x400000 (1.0.0)
cl_khr_external_semaphore_opaque_fd 0x400000 (1.0.0)
cl_khr_external_memory_opaque_fd 0x400000 (1.0.0)
cl_khr_semaphore 0x400000 (1.0.0)
Platform Numeric Version 0xc00000 (3.0.0)
Platform Extensions function suffix NV
Platform Host timer resolution 0ns
Platform External memory handle types Opaque FD
Platform Semaphore types <gatherPlatformInfo:11: get CL_PLATFORM_SEMAPHORE_TYPES_KHR size : error -30>
Platform External semaphore import types Opaque FD
Platform External semaphore export types <gatherPlatformInfo:13: get CL_PLATFORM_SEMAPHORE_EXPORT_HANDLE_TYPES_KHR : error -30>
Platform Name rusticl
Platform Vendor Mesa/X.org
Platform Version OpenCL 3.0
Platform Profile FULL_PROFILE
Platform Extensions cl_khr_icd
Platform Extensions with Version cl_khr_icd 0x800000 (2.0.0)
Platform Numeric Version 0xc00000 (3.0.0)
Platform Extensions function suffix MESA
Platform Host timer resolution 1ns
Platform Name NVIDIA CUDA
Number of devices 1
Device Name NVIDIA GeForce GTX 960
Device Vendor NVIDIA Corporation
Device Vendor ID 0x10de
Device Version OpenCL 3.0 CUDA
Device UUID ae16d435-d7f7-a757-9470-5d6f94bbd3b5
Driver UUID ae16d435-d7f7-a757-9470-5d6f94bbd3b5
Valid Device LUID No
Device LUID 6d69-637300000000
Device Node Mask 0
Device Numeric Version 0xc00000 (3.0.0)
Driver Version 580.95.05
Device OpenCL C Version OpenCL C 1.2
Device OpenCL C all versions OpenCL C 0x400000 (1.0.0)
OpenCL C 0x401000 (1.1.0)
OpenCL C 0x402000 (1.2.0)
OpenCL C 0xc00000 (3.0.0)
Device OpenCL C features __opencl_c_fp64 0xc00000 (3.0.0)
__opencl_c_images 0xc00000 (3.0.0)
__opencl_c_int64 0xc00000 (3.0.0)
__opencl_c_3d_image_writes 0xc00000 (3.0.0)
Latest conformance test passed v2025-04-04-00
Device Type GPU
Device Topology (NV) PCI-E, 0000:01:00.0
Device PCI bus info (KHR) PCI-E, 0000:01:00.0
Device Profile FULL_PROFILE
Device Available Yes
Compiler Available Yes
Linker Available Yes
Max compute units 8
Max clock frequency 1278MHz
Compute Capability (NV) 5.2
Device Partition (core)
Max number of sub-devices 1
Supported partition types None
Supported affinity domains (n/a)
Max work item dimensions 3
Max work item sizes 1024x1024x64
Max work group size 1024
Preferred work group size multiple (device) 32
Preferred work group size multiple (kernel) 32
Warp size (NV) 32
Max sub-groups per work group 0
Preferred / native vector sizes
char 1 / 1
short 1 / 1
int 1 / 1
long 1 / 1
half 0 / 0 (n/a)
float 1 / 1
double 1 / 1 (cl_khr_fp64)
Half-precision Floating-point support (n/a)
Single-precision Floating-point support (core)
Denormals Yes
Infinity and NANs Yes
Round to nearest Yes
Round to zero Yes
Round to infinity Yes
IEEE754-2008 fused multiply-add Yes
Support is emulated in software No
Correctly-rounded divide and sqrt operations Yes
Double-precision Floating-point support (cl_khr_fp64)
Denormals Yes
Infinity and NANs Yes
Round to nearest Yes
Round to zero Yes
Round to infinity Yes
IEEE754-2008 fused multiply-add Yes
Support is emulated in software No
Address bits 64, Little-Endian
External memory handle types Opaque FD
Semaphore types <printDeviceInfo:105: get number of CL_DEVICE_SEMAPHORE_TYPES_KHR : error -30>
External semaphore import types Opaque FD
External semaphore export types (n/a)
Global memory size 4223729664 (3.934GiB)
Error Correction support No
Max memory allocation 1055932416 (1007MiB)
Unified memory for Host and Device No
Integrated memory (NV) No
Shared Virtual Memory (SVM) capabilities (core)
Coarse-grained buffer sharing Yes
Fine-grained buffer sharing No
Fine-grained system sharing No
Atomics No
Minimum alignment for any data type 128 bytes
Alignment of base address 4096 bits (512 bytes)
Preferred alignment for atomics
SVM 0 bytes
Global 0 bytes
Local 0 bytes
Atomic memory capabilities relaxed, work-group scope
Atomic fence capabilities relaxed, acquire/release, work-group scope
Max size for global variable 0
Preferred total size of global vars 0
Global Memory cache type Read/Write
Global Memory cache size 393216 (384KiB)
Global Memory cache line size 128 bytes
Image support Yes
Max number of samplers per kernel 32
Max size for 1D images from buffer 268435456 pixels
Max 1D or 2D image array size 2048 images
Base address alignment for 2D image buffers 0 bytes
Pitch alignment for 2D image buffers 0 pixels
Max 2D image size 16384x16384 pixels
Max 3D image size 4096x4096x4096 pixels
Max number of read image args 256
Max number of write image args 16
Max number of read/write image args 0
Pipe support No
Max number of pipe args 0
Max active pipe reservations 0
Max pipe packet size 0
Local memory type Local
Local memory size 49152 (48KiB)
Registers per block (NV) 65536
Max number of constant args 9
Max constant buffer size 65536 (64KiB)
Generic address space support No
Max size of kernel argument 4352 (4.25KiB)
Queue properties (on host)
Out-of-order execution Yes
Profiling Yes
Device enqueue capabilities (n/a)
Queue properties (on device)
Out-of-order execution No
Profiling No
Preferred size 0
Max size 0
Max queues on device 0
Max events on device 0
Prefer user sync for interop No
Profiling timer resolution 1000ns
Execution capabilities
Run OpenCL kernels Yes
Run native kernels No
Non-uniform work-groups No
Work-group collective functions No
Sub-group independent forward progress No
Kernel execution timeout (NV) No
Concurrent copy and kernel execution (NV) Yes
Number of async copy engines 2
IL version (n/a)
ILs with version (n/a)
printf() buffer size 1048576 (1024KiB)
Built-in kernels (n/a)
Built-in kernels with version (n/a)
Device 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_fp64 cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_icd cl_khr_gl_sharing cl_nv_compiler_options cl_nv_device_attribute_query cl_nv_pragma_unroll cl_nv_copy_opts cl_nv_create_buffer cl_khr_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_device_uuid cl_khr_pci_bus_info cl_khr_external_semaphore cl_khr_external_memory cl_khr_external_semaphore_opaque_fd cl_khr_external_memory_opaque_fd cl_khr_semaphore
Device Extensions with Version cl_khr_global_int32_base_atomics 0x400000 (1.0.0)
cl_khr_global_int32_extended_atomics 0x400000 (1.0.0)
cl_khr_local_int32_base_atomics 0x400000 (1.0.0)
cl_khr_local_int32_extended_atomics 0x400000 (1.0.0)
cl_khr_fp64 0x400000 (1.0.0)
cl_khr_3d_image_writes 0x400000 (1.0.0)
cl_khr_byte_addressable_store 0x400000 (1.0.0)
cl_khr_icd 0x400000 (1.0.0)
cl_khr_gl_sharing 0x400000 (1.0.0)
cl_nv_compiler_options 0x400000 (1.0.0)
cl_nv_device_attribute_query 0x400000 (1.0.0)
cl_nv_pragma_unroll 0x400000 (1.0.0)
cl_nv_copy_opts 0x400000 (1.0.0)
cl_nv_create_buffer 0x400000 (1.0.0)
cl_khr_int64_base_atomics 0x400000 (1.0.0)
cl_khr_int64_extended_atomics 0x400000 (1.0.0)
cl_khr_device_uuid 0x400000 (1.0.0)
cl_khr_pci_bus_info 0x400000 (1.0.0)
cl_khr_external_semaphore 0x400000 (1.0.0)
cl_khr_external_memory 0x400000 (1.0.0)
cl_khr_external_semaphore_opaque_fd 0x400000 (1.0.0)
cl_khr_external_memory_opaque_fd 0x400000 (1.0.0)
cl_khr_semaphore 0x400000 (1.0.0)
Platform Name rusticl
Number of devices 0
NULL platform behavior
clGetPlatformInfo(NULL, CL_PLATFORM_NAME, ...) No platform
clGetDeviceIDs(NULL, CL_DEVICE_TYPE_ALL, ...) No platform
clCreateContext(NULL, ...) [default] No platform
clCreateContext(NULL, ...) [other] Success [NV]
clCreateContextFromType(NULL, CL_DEVICE_TYPE_DEFAULT) No platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU) No platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_ACCELERATOR) No devices found in platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_CUSTOM) Invalid device type for platform
clCreateContextFromType(NULL, CL_DEVICE_TYPE_ALL) No platformThanks for suggesting the right move, in any case!
Pierric.
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#4 2025-10-12 13:22:37
- Lone_Wolf
- Administrator
- From: Netherlands, Europe
- Registered: 2005-10-04
- Posts: 14,315
Re: opencl, darktable and nvidia gtx 960
One thing to keep in mind :
opencl-mesa is rusticl and (on archlinux) doesn't enable any driver support by default.
You have to manually enable the driver you want to use , see https://docs.mesa3d.org/envvars.html#en … ICL_ENABLE
Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.
clean chroot building not flexible enough ?
Try clean chroot manager by graysky
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#5 2025-10-12 17:49:06
- pierric
- Member
- Registered: 2021-04-12
- Posts: 14
Re: opencl, darktable and nvidia gtx 960
Noted! I was not sure what driver name to try, thanks for sharing the right docs. Now I can see it would only be useful if I was on the nouveau driver, but currently I'm using the official nvidia one, so the opencl-nvidia package was indeed the one I needed!
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