openCL not working on Win11 With Intel Graphics

Software darktable
1

Hi all,

I cannot bring openCL to work on my machine.

OS: Windows 11
Hardware: CPU Intel Core 7 240H, Intel Graphics (Integriert)
Darktable version: 5.4.1
Intel Driver version: 32.0.101.7048 (latest)

What I tried so far:

  • updated Graphics Driver (all drivers, actually) using official Intel Driver tool omitting using Lenovo tool → confirmed Intel Raphics Driver is latest one after that → But did not help
  • adding this directive to rhe darktablerc, also did not help: opencl_disable_drivers_blacklist=TRUE

Output of darktable-cltest.exe below.
In previous threads (also showing “”) I read about checking for a line like
cldevice_v5_intelropenclgraphicsintelririsrxegraphics=a b c d e f g 1 i j k
and changing the “1” part. but: In my darktablerc there is no entry starting with cldevice_ at all.

Can anybody help here?

cltest output

C:\Program Files\darktable\bin>darktable-cltest.exe
darktable 5.4.1
Copyright (C) 2012-2026 Johannes Hanika and other contributors.

Compile options:
Bit depth → 64 bit
Exiv2 → 0.27.7
Lensfun → 0.3.4
Debug → DISABLED
SSE2 optimizations → ENABLED
OpenMP → ENABLED
OpenCL → ENABLED
Lua → ENABLED - API version 9.6.0
Colord → DISABLED
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-Release
OpenJPEG → ENABLED
OpenEXR → ENABLED
WebP → ENABLED

See resources | darktable for detailed documentation.
See Sign in to GitHub · GitHub to report bugs.

 2,0364 [opencl_init] opencl disabled via darktable preferences
 2,0409 [opencl_init] opencl library 'OpenCL.dll' found on your system and loaded, preference 'default path'
 2,0972 [opencl_init] found 2 platforms

[opencl_init] found 2 devices

[dt_opencl_device_init]
DEVICE: 0: ‘Intel(R) Graphics’
CONF KEY: cldevice_v5_intelropenclgraphicsintelrgraphics
PLATFORM, VENDOR & ID: Intel(R) OpenCL Graphics, Intel(R) Corporation, ID=32902
CANONICAL NAME: intelropenclgraphicsintelrgraphics
DRIVER VERSION: 32.0.101.7084
DEVICE VERSION: OpenCL 3.0 NEO
DEVICE_TYPE: GPU, unified mem
GLOBAL MEM SIZE: 14712 MB
MAX MEM ALLOC: 4096 MB
MAX IMAGE SIZE: 16384 x 16384
MAX CONSTANT BUFFER: 4194296 KB
ADDRESS ALIGN: 128
COMPUTE UNITS: 64
MAX WORK GROUP SIZE: 512
MAX WORK ITEM DIMENSIONS: 3
MAX WORK ITEM SIZES: [ 512 512 512 ]
ASYNC PIXELPIPE: NO
PINNED MEMORY TRANSFER: NO
AVOID ATOMICS: NO
MICRO NAP: 250
ROUNDUP WIDTH & HEIGHT 16x16
CHECK EVENT HANDLES: 128
TILING ADVANTAGE: 0,000
DEFAULT DEVICE: NO
*** marked as disabled ***

[dt_opencl_device_init]
DEVICE: 1: ‘Intel(R) Core™ 7 240H’
CONF KEY: cldevice_v5_intelropenclintelrcoretm7240h
PLATFORM, VENDOR & ID: Intel(R) OpenCL, Intel(R) Corporation, ID=32902
CANONICAL NAME: intelropenclintelrcoretm7240h
DRIVER VERSION: 2025.20.10.0.23_160000
DEVICE VERSION: OpenCL 3.0 (Build 0)
DEVICE_TYPE: CPU, unified mem
GLOBAL MEM SIZE: 32260 MB
MAX MEM ALLOC: 16130 MB
MAX IMAGE SIZE: 16384 x 16384
MAX CONSTANT BUFFER: 128 KB
ADDRESS ALIGN: 128
COMPUTE UNITS: 16
MAX WORK GROUP SIZE: 8192
MAX WORK ITEM DIMENSIONS: 3
MAX WORK ITEM SIZES: [ 8192 8192 8192 ]
ASYNC PIXELPIPE: NO
PINNED MEMORY TRANSFER: NO
AVOID ATOMICS: NO
MICRO NAP: 1000
ROUNDUP WIDTH & HEIGHT 16x16
CHECK EVENT HANDLES: 128
TILING ADVANTAGE: 0,000
DEFAULT DEVICE: NO
*** marked as disabled ***
[opencl_init] no suitable devices found.
2,1554 [opencl_init] FINALLY: opencl PREFERENCE=OFF is NOT AVAILABLE and NOT ENABLED.

press any key to exit

2

Sorry, missed some copy-in:

In previous threads (also showing “”)

This one should read:

In previous threads (also showing “marked as disabled”)

3

I think it should be 0 to enable it. In 5.6 we wont blacklist the intel drivers for windows. Also make sure you enable OpenCL in preferences.

1 Like
4

(post deleted by author)

5

Hi g-man,

I think it should be 0 to enable it

Fully agree. But please read my comment above again - this is just an example. I do NOT have ANY line with “cldevice” appearing in my darktablerc at all. So I cannot activate it manually again either.

In 5.6 we wont blacklist the intel drivers for windows

understood. But, should this blacklisting not anyway be prevented with my config setting “opencl_disable_drivers_blacklist=TRUE”, alsofor 5.4.1?

Also make sure you enable OpenCL in preferences.

Certainly would like to do so, but it’s greyed out / impossible due to failing opencl capability checks.

6

Can you post your darktablerc file? Can you also post the output from darktable -d common?

7

sure!

darktablerc copied from here, just aded extension .txt to satisfy upload requirements in the forum:
C:\Program Files\darktable\share\darktable\darktablerc

darktable-log.txt (5.1 KB)
darktablerc.txt (20.7 KB)

8

That’s the wrong path. Thats used on a first start. The right path is:

Install file locations

The install of darktable creates the following folders:

    %ProgramFiles%\darktable\
    - the program files to run darktable
    %LOCALAPPDATA%\darktable\
    - configuration (darktablerc), databases (data.db and library.db), styles, and backups files are stored here. If the user manual references
    .config/darktable/
    , it means this location on Windows.
9

Bummer. Thanks for pointing out. That helped!

Lines about cldevice there:

cldevice_v5_intelropenclgraphicsintelrgraphics=0 250 0 16 16 128 0 1 0.000 0.000 0.250
cldevice_v5_intelropenclgraphicsintelrgraphics_building=
cldevice_v5_intelropenclgraphicsintelrgraphics_id0=600
cldevice_v5_intelropenclintelrcoretm7240h=0 1000 0 16 16 128 0 1 0.000 0.000 0.250
cldevice_v5_intelropenclintelrcoretm7240h_id0=600
cldevice_v5_intelropenclintelrcoretm7240h_id1=600

changed the first one to

cldevice_v5_intelropenclgraphicsintelrgraphics=0 250 0 16 16 128 0 0 0.000 0.000 0.250

Now I could activate the openCL support in the preferences after a successful run of darktable-cltest.exe

Thanks g-man, you made my day! :slight_smile:

2 Likes
10

If you have plenty of RAM in your system, you may want to change the last parameter from 0.250 to 0.500 which allows 50% instead of 25% of your RAM to be assigned to the build-in Intel XE graphics. Your export will typically speed up with more RAM being available…

You may want to test your system performance with @Qor’s nice tool :sunglasses:

1 Like
11

Please let us know if you run into issues with the Intel drivers. I haven’t hence why we remove them from the blacklist for the next release.