darktable, installed via flatpak on debian, opencl support

atte · April 7, 2023, 1:02pm

I’m trying to get darktable working with opencl. Since all opencl options in preferences are greyed out with the text “not available”, I’m led to believe there “something outside of darktable” that I need to take care of.

It seems I have two darktable binaries on the system, not sure why.
The one I’ve been using so far, that works is:
/var/lib/flatpak/exports/bin/org.darktable.Darktable

This one fails with “libOpenEXR-3_1.so.30: cannot open shared object file: No such file or directory”:
/var/lib/flatpak/app/org.darktable.Darktable/current/e4c1a74e092a04300
c463ed8d03dbeb4de4da8dada632470533d3e41c5b59d17/files/bin/darktable

Well I’m not even sure I’m supposed to run that second binary, but at least it gives me opencl-hopes, especially when I see this:

atte@ajstrup:~$ ll /var/lib/flatpak/app/org.darktable.Darktable/current/e4c1a74e092a04300c463ed8d03dbeb4de4da8dada632470533d3e41c5b59d17/files/bin/
total 6.7M
-rwxr-xr-x 2 root root 23K Jan 1 1970 cd-convert
-rwxr-xr-x 2 root root 27K Jan 1 1970 cd-create-profile
-rwxr-xr-x 2 root root 31K Jan 1 1970 cd-fix-profile
-rwxr-xr-x 2 root root 15K Jan 1 1970 cd-iccdump
-rwxr-xr-x 2 root root 27K Jan 1 1970 cd-it8
-rwxr-xr-x 2 root root 67K Jan 1 1970 colormgr
-rwxr-xr-x 2 root root 15K Jan 1 1970 darktable
-rwxr-xr-x 2 root root 99K Jan 1 1970 darktable-chart
-rwxr-xr-x 2 root root 31K Jan 1 1970 darktable-cli
-rwxr-xr-x 2 root root 15K Jan 1 1970 darktable-cltest
-rwxr-xr-x 2 root root 23K Jan 1 1970 darktable-cmstest
-rwxr-xr-x 2 root root 23K Jan 1 1970 darktable-generate-cache
-rwxr-xr-x 2 root root 895K Jan 1 1970 darktable-rs-identify
-rwxr-xr-x 2 root root 23K Jan 1 1970 dec265
-rwxr-xr-x 2 root root 31K Jan 1 1970 enc265
-rwxr-xr-x 2 root root 3.4M Jan 1 1970 git
-rwxr-xr-x 2 root root 160K Jan 1 1970 git-cvsserver
lrwxrwxrwx 1 root root 3 Feb 20 11:27 git-receive-pack → git
-rwxr-xr-x 2 root root 1.9M Jan 1 1970 git-shell
lrwxrwxrwx 1 root root 3 Feb 20 11:27 git-upload-archive → git
lrwxrwxrwx 1 root root 3 Feb 20 11:27 git-upload-pack → git
-rwxr-xr-x 2 root root 15K Jan 1 1970 gm
-rwxr-xr-x 2 root root 23K Jan 1 1970 gusbcmd
-rwxr-xr-x 2 root root 19K Jan 1 1970 hdrcopy

ll /var/lib/flatpak/app/org.darktable.Darktable/current/e4c1a74e092a04300c463ed8d03dbeb4de4da8dada632470533d3e41c5b59d17/files/lib
total 38M
drwxr-xr-x 4 root root 4.0K Jan 1 1970 darktable
drwxr-xr-x 2 root root 4.0K Jan 1 1970 debug
drwxr-xr-x 3 root root 4.0K Jan 1 1970 GraphicsMagick-1.3.38
lrwxrwxrwx 1 root root 17 Feb 20 11:27 libavif.so.11 → libavif.so.11.0.0
-rwxr-xr-x 2 root root 7.8M Jan 1 1970 libavif.so.11.0.0
lrwxrwxrwx 1 root root 18 Feb 20 11:27 libcolord-gtk.so → libcolord-gtk.so.1
lrwxrwxrwx 1 root root 22 Feb 20 11:27 libcolord-gtk.so.1 → libcolord-gtk.so.1.0.3
-rwxr-xr-x 2 root root 35K Jan 1 1970 libcolord-gtk.so.1.0.3
lrwxrwxrwx 1 root root 21 Feb 20 11:27 libcolordprivate.so → libcolordprivate.so.2
lrwxrwxrwx 1 root root 25 Feb 20 11:27 libcolordprivate.so.2 → libcolordprivate.so.2.0.5
-rwxr-xr-x 2 root root 236K Jan 1 1970 libcolordprivate.so.2.0.5
lrwxrwxrwx 1 root root 14 Feb 20 11:27 libcolord.so → libcolord.so.2
lrwxrwxrwx 1 root root 18 Feb 20 11:27 libcolord.so.2 → libcolord.so.2.0.5
-rwxr-xr-x 2 root root 368K Jan 1 1970 libcolord.so.2.0.5
lrwxrwxrwx 1 root root 16 Feb 20 11:27 libcolorhug.so → libcolorhug.so.2
lrwxrwxrwx 1 root root 20 Feb 20 11:27 libcolorhug.so.2 → libcolorhug.so.2.0.5
-rwxr-xr-x 2 root root 95K Jan 1 1970 libcolorhug.so.2.0.5
lrwxrwxrwx 1 root root 14 Feb 20 11:27 libexiv2.so → libexiv2.so.27
-rwxr-xr-x 2 root root 3.2M Jan 1 1970 libexiv2.so.0.27.5
lrwxrwxrwx 1 root root 18 Feb 20 11:27 libexiv2.so.27 → libexiv2.so.0.27.5
-rwxr-xr-x 2 root root 12M Jan 1 1970 libgmic.so.1
drwxr-xr-x 3 root root 4.0K Jan 1 1970 libgphoto2
drwxr-xr-x 3 root root 4.0K Jan 1 1970 libgphoto2_port
lrwxrwxrwx 1 root root 25 Feb 20 11:27 libgphoto2_port.so → libgphoto2_port.so.12.1.0
lrwxrwxrwx 1 root root 25 Feb 20 11:27 libgphoto2_port.so.12 → libgphoto2_port.so.12.1.0
-rwxr-xr-x 2 root root 51K Jan 1 1970 libgphoto2_port.so.12.1.0
lrwxrwxrwx 1 root root 19 Feb 20 11:27 libgphoto2.so → libgphoto2.so.6.3.0
lrwxrwxrwx 1 root root 19 Feb 20 11:27 libgphoto2.so.6 → libgphoto2.so.6.3.0
-rwxr-xr-x 2 root root 159K Jan 1 1970 libgphoto2.so.6.3.0
lrwxrwxrwx 1 root root 29 Feb 20 11:27 libGraphicsMagick++.so → libGraphicsMagick++.so.12.6.0
lrwxrwxrwx 1 root root 27 Feb 20 11:27 libGraphicsMagick.so → libGraphicsMagick.so.3.24.0
lrwxrwxrwx 1 root root 29 Feb 20 11:27 libGraphicsMagick++.so.12 → libGraphicsMagick++.so.12.6.0
-rwxr-xr-x 2 root root 519K Jan 1 1970 libGraphicsMagick++.so.12.6.0
lrwxrwxrwx 1 root root 27 Feb 20 11:27 libGraphicsMagick.so.3 → libGraphicsMagick.so.3.24.0
-rwxr-xr-x 2 root root 2.9M Jan 1 1970 libGraphicsMagick.so.3.24.0
lrwxrwxrwx 1 root root 30 Feb 20 11:27 libGraphicsMagickWand.so → libGraphicsMagickWand.so.2.9.7
lrwxrwxrwx 1 root root 30 Feb 20 11:27 libGraphicsMagickWand.so.2 → libGraphicsMagickWand.so.2.9.7
-rwxr-xr-x 2 root root 199K Jan 1 1970 libGraphicsMagickWand.so.2.9.7
lrwxrwxrwx 1 root root 12 Feb 20 11:27 libgusb.so → libgusb.so.2
lrwxrwxrwx 1 root root 17 Feb 20 11:27 libgusb.so.2 → libgusb.so.2.0.10
-rwxr-xr-x 2 root root 75K Jan 1 1970 libgusb.so.2.0.10
lrwxrwxrwx 1 root root 12 Feb 20 11:27 libheif.so → libheif.so.1
lrwxrwxrwx 1 root root 19 Feb 20 11:27 libheif.so.1 → libheif.so.1.12.0.0
-rwxr-xr-x 2 root root 527K Jan 1 1970 libheif.so.1.12.0.0
lrwxrwxrwx 1 root root 16 Feb 20 11:27 libIex-3_1.so → libIex-3_1.so.30
lrwxrwxrwx 1 root root 20 Feb 20 11:27 libIex-3_1.so.30 → libIex-3_1.so.30.3.0
-rwxr-xr-x 2 root root 563K Jan 1 1970 libIex-3_1.so.30.3.0
lrwxrwxrwx 1 root root 13 Feb 20 11:27 libIex.so → libIex-3_1.so
lrwxrwxrwx 1 root root 22 Feb 20 11:27 libIlmThread-3_1.so → libIlmThread-3_1.so.30
lrwxrwxrwx 1 root root 26 Feb 20 11:27 libIlmThread-3_1.so.30 → libIlmThread-3_1.so.30.3.0
-rwxr-xr-x 2 root root 35K Jan 1 1970 libIlmThread-3_1.so.30.3.0
lrwxrwxrwx 1 root root 19 Feb 20 11:27 libIlmThread.so → libIlmThread-3_1.so
lrwxrwxrwx 1 root root 18 Feb 20 11:27 libImath-3_1.so → libImath-3_1.so.29
lrwxrwxrwx 1 root root 22 Feb 20 11:27 libImath-3_1.so.29 → libImath-3_1.so.29.2.0
-rwxr-xr-x 2 root root 327K Jan 1 1970 libImath-3_1.so.29.2.0
lrwxrwxrwx 1 root root 15 Feb 20 11:27 libImath.so → libImath-3_1.so
lrwxrwxrwx 1 root root 14 Feb 20 11:27 libjasper.so → libjasper.so.4
lrwxrwxrwx 1 root root 18 Feb 20 11:27 libjasper.so.4 → libjasper.so.4.0.0
-rwxr-xr-x 2 root root 311K Jan 1 1970 libjasper.so.4.0.0
lrwxrwxrwx 1 root root 13 Feb 20 11:27 libjxl.so → libjxl.so.0.7
lrwxrwxrwx 1 root root 15 Feb 20 11:27 libjxl.so.0.7 → libjxl.so.0.7.0
-rwxr-xr-x 2 root root 3.6M Jan 1 1970 libjxl.so.0.7.0
lrwxrwxrwx 1 root root 21 Feb 20 11:27 libjxl_threads.so → libjxl_threads.so.0.7
lrwxrwxrwx 1 root root 23 Feb 20 11:27 libjxl_threads.so.0.7 → libjxl_threads.so.0.7.0
-rwxr-xr-x 2 root root 23K Jan 1 1970 libjxl_threads.so.0.7.0
lrwxrwxrwx 1 root root 15 Feb 20 11:27 liblensfun.so → liblensfun.so.1
-rwxr-xr-x 2 root root 131K Jan 1 1970 liblensfun.so.0.3.3
lrwxrwxrwx 1 root root 19 Feb 20 11:27 liblensfun.so.1 → liblensfun.so.0.3.3
-rwxr-xr-x 2 root root 811K Jan 1 1970 liblibde265.so
lrwxrwxrwx 1 root root 15 Feb 20 11:27 liblua.so → liblua.so.5.4.4
lrwxrwxrwx 1 root root 15 Feb 20 11:27 liblua.so.5.4 → liblua.so.5.4.4
-rw-r–r-- 2 root root 276K Jan 1 1970 liblua.so.5.4.4
lrwxrwxrwx 1 root root 20 Feb 20 11:27 libOpenEXR-3_1.so → libOpenEXR-3_1.so.30
lrwxrwxrwx 1 root root 24 Feb 20 11:27 libOpenEXR-3_1.so.30 → libOpenEXR-3_1.so.30.3.0
-rwxr-xr-x 2 root root 3.3M Jan 1 1970 libOpenEXR-3_1.so.30.3.0
lrwxrwxrwx 1 root root 24 Feb 20 11:27 libOpenEXRCore-3_1.so → libOpenEXRCore-3_1.so.30
lrwxrwxrwx 1 root root 28 Feb 20 11:27 libOpenEXRCore-3_1.so.30 → libOpenEXRCore-3_1.so.30.3.0
-rwxr-xr-x 2 root root 515K Jan 1 1970 libOpenEXRCore-3_1.so.30.3.0
lrwxrwxrwx 1 root root 21 Feb 20 11:27 libOpenEXRCore.so → libOpenEXRCore-3_1.so
lrwxrwxrwx 1 root root 17 Feb 20 11:27 libOpenEXR.so → libOpenEXR-3_1.so
lrwxrwxrwx 1 root root 24 Feb 20 11:27 libOpenEXRUtil-3_1.so → libOpenEXRUtil-3_1.so.30
lrwxrwxrwx 1 root root 28 Feb 20 11:27 libOpenEXRUtil-3_1.so.30 → libOpenEXRUtil-3_1.so.30.3.0
-rwxr-xr-x 2 root root 227K Jan 1 1970 libOpenEXRUtil-3_1.so.30.3.0
lrwxrwxrwx 1 root root 21 Feb 20 11:27 libOpenEXRUtil.so → libOpenEXRUtil-3_1.so
lrwxrwxrwx 1 root root 25 Feb 20 11:27 libosmgpsmap-1.0.so → libosmgpsmap-1.0.so.1.1.0
lrwxrwxrwx 1 root root 25 Feb 20 11:27 libosmgpsmap-1.0.so.1 → libosmgpsmap-1.0.so.1.1.0
-rwxr-xr-x 2 root root 111K Jan 1 1970 libosmgpsmap-1.0.so.1.1.0
lrwxrwxrwx 1 root root 16 Feb 20 11:27 libportmidi.so → libportmidi.so.2
lrwxrwxrwx 1 root root 20 Feb 20 11:27 libportmidi.so.2 → libportmidi.so.2.0.3
-rwxr-xr-x 2 root root 51K Jan 1 1970 libportmidi.so.2.0.3
lrwxrwxrwx 1 root root 19 Feb 20 11:27 libusb-1.0.so → libusb-1.0.so.0.3.0
lrwxrwxrwx 1 root root 19 Feb 20 11:27 libusb-1.0.so.0 → libusb-1.0.so.0.3.0
-rwxr-xr-x 2 root root 123K Jan 1 1970 libusb-1.0.so.0.3.0
drwxr-xr-x 3 root root 4.0K Jan 1 1970 lua
drwxr-xr-x 2 root root 4.0K Jan 1 1970 udev
drwxr-xr-x 3 root root 4.0K Jan 1 1970 x86_64-linux-gnu

So it seems I do have opencl available, but not really. Any clues on how to proceed, any libraries or opencl stuff that needs to be installed via apt-get on the system?

krupkat · April 7, 2023, 2:06pm

I think there are issues with AMD + OpenCL in flatpak: Darktable Flatpak doesn't recognise OpenCL even with -d opencl flag · Issue #68 · flathub/org.darktable.Darktable · GitHub

Basically it cannot be achieved at the moment, you can try the non flatpak version.

With Nvidia it could work as the driver is included in the flatpak sandbox. I haven’t tested this personally.

atte · April 7, 2023, 3:31pm

Thanks! I believe I’m on Intel, rather than AMD…

atte@ajstrup:~$ lspci | grep Grap
00:02.0 VGA compatible controller: Intel Corporation CometLake-S GT2 [UHD Graphics 630] (rev 03)

In any case, I’ll try a build from source, see if that changes anything! Thanks!

paperdigits · April 7, 2023, 3:37pm

For future reference, don’t run the binary from a flatpak directly, run it like flatpak run org.darktable.Darktable

atte · April 7, 2023, 4:02pm

Cool, thank, I’ll do that!

Anyways, I build darktable from source and OpenCL is still not available, any idea if it’s possible:

atte@ajstrup:~/software/darktable$ /opt/darktable/bin/darktable-cltest
[dt_get_sysresource_level] switched to 1 as `default’
total mem: 7848MB
mipmap cache: 981MB
available mem: 3924MB
singlebuff: 61MB
OpenCL tune mem: OFF
OpenCL pinned: OFF
[opencl_init] opencl related configuration options:
[opencl_init] opencl: ON
[opencl_init] opencl_scheduling_profile: ‘default’
[opencl_init] opencl_library: ‘default path’
[opencl_init] opencl_device_priority: ‘/!0,///!0,*’
[opencl_init] opencl_mandatory_timeout: 400
[opencl_init] opencl library ‘libOpenCL.so.1’ found on your system and loaded
[opencl_init] found 1 platform
[opencl_init] no devices found for Mesa (vendor) - Clover (name)
[opencl_init] found 0 device
[opencl_init] FINALLY: opencl is NOT AVAILABLE on this system.
[opencl_init] initial status of opencl enabled flag is OFF.

atte@ajstrup:~/software/darktable$ mlocate libOpenCL.so.1
/usr/lib/i386-linux-gnu/libOpenCL.so.1
/usr/lib/i386-linux-gnu/libOpenCL.so.1.0.0
/usr/lib/x86_64-linux-gnu/libOpenCL.so.1
/usr/lib/x86_64-linux-gnu/libOpenCL.so.1.0.0
/var/lib/flatpak/runtime/org.gnome.Platform/x86_64/40/83cb0a34f6f1671c54e72706e829a8070a9a3a4add2c812e2b50fbfe6e368df2/files/lib/x86_64-linux-gnu/libOpenCL.so.1
/var/lib/flatpak/runtime/org.gnome.Platform/x86_64/40/83cb0a34f6f1671c54e72706e829a8070a9a3a4add2c812e2b50fbfe6e368df2/files/lib/x86_64-linux-gnu/libOpenCL.so.1.0.0
/var/lib/flatpak/runtime/org.gnome.Platform/x86_64/43/01e39e8c8bfdbf6effded1ca6c5a88b4177b920d4761dc20d8a334d675d051a5/files/lib/x86_64-linux-gnu/libOpenCL.so.1
/var/lib/flatpak/runtime/org.gnome.Platform/x86_64/43/01e39e8c8bfdbf6effded1ca6c5a88b4177b920d4761dc20d8a334d675d051a5/files/lib/x86_64-linux-gnu/libOpenCL.so.1.0.0
/var/lib/flatpak/runtime/org.kde.Platform/x86_64/6.3/da5db79df3afb70fe080b06f44b84ef1db3400ea8eb8cba77c22ab07c9065f64/files/lib/x86_64-linux-gnu/libOpenCL.so.1
/var/lib/flatpak/runtime/org.kde.Platform/x86_64/6.3/da5db79df3afb70fe080b06f44b84ef1db3400ea8eb8cba77c22ab07c9065f64/files/lib/x86_64-linux-gnu/libOpenCL.so.1.0.0

paperdigits · April 7, 2023, 5:13pm

What Intel open cl driver do you have? It needs to be the “neo” driver

atte · April 7, 2023, 7:23pm

Thanks, that did it, its working now.

Thanks!

jchnkl · May 13, 2023, 11:25am

Hi,

I too had problems with flatpak & OpenCL. I got it to work by fixing the app permissions with Flatseal. I also wrote about it here:

github.com/flathub/org.darktable.Darktable

Darktable Flatpak doesn't recognise OpenCL even with -d opencl flag

opened 11:02PM - 27 Oct 20 UTC

KristijanZic

I'm having the same issue as https://github.com/flatpak/flatpak/issues/3900?_pja…x=%23js-repo-pjax-container on Ubuntu 20.04.1, Threadripper 1900x, Vega 64 Liquid, amdgpu-pro 20.40 driver installed with --opencl=pal flag. <details><summary>$ flatpak run org.darktable.Darktable -d opencl</summary> <pre> Gtk-Message: 22:53:19.115: Failed to load module "canberra-gtk-module" Gtk-Message: 22:53:19.118: Failed to load module "canberra-gtk-module" 0.096296 [opencl_init] opencl related configuration options: 0.096305 [opencl_init] 0.096307 [opencl_init] opencl: 1 0.096309 [opencl_init] opencl_scheduling_profile: 'default' 0.096314 [opencl_init] opencl_library: '' 0.096321 [opencl_init] opencl_memory_requirement: 768 0.096327 [opencl_init] opencl_memory_headroom: 400 0.096330 [opencl_init] opencl_device_priority: '*/!0,*/*/*/!0,*' 0.096335 [opencl_init] opencl_mandatory_timeout: 200 0.096339 [opencl_init] opencl_size_roundup: 16 0.096343 [opencl_init] opencl_async_pixelpipe: 0 0.096347 [opencl_init] opencl_synch_cache: active module 0.096349 [opencl_init] opencl_number_event_handles: 25 0.096352 [opencl_init] opencl_micro_nap: 1000 0.096357 [opencl_init] opencl_use_pinned_memory: 0 0.096360 [opencl_init] opencl_use_cpu_devices: 0 0.096363 [opencl_init] opencl_avoid_atomics: 0 0.096364 [opencl_init] 0.096442 [opencl_init] could not find opencl runtime library 'libOpenCL' 0.096474 [opencl_init] could not find opencl runtime library 'libOpenCL.so' 0.097122 [opencl_init] found opencl runtime library 'libOpenCL.so.1' 0.097143 [opencl_init] opencl library 'libOpenCL.so.1' found on your system and loaded 0.268473 [opencl_init] found 1 platform 0.268497 [opencl_init] found 1 device 0.268521 [opencl_init] discarding device 0 `Radeon RX Vega (VEGA10, DRM 3.40.0, 5.4.0-52-generic, LLVM 10.0.1)' - The OpenCL driver doesn't provide image support. See also 'clinfo' output. 0.268526 [opencl_init] no suitable devices found. 0.268528 [opencl_init] FINALLY: opencl is NOT AVAILABLE on this system. 0.268531 [opencl_init] initial status of opencl enabled flag is OFF. </pre> </details> **The result in the GUI is that OpenCL checkbox and label are grayed out** ![Screenshot from 2020-10-27 22-58-43](https://user-images.githubusercontent.com/10299892/97366702-0907a380-18a8-11eb-806f-e73a45cc9eb6.png) <details><summary>neofetch</summary> <pre> OS: Ubuntu 20.04.1 LTS x86_64 Kernel: 5.4.0-52-generic Uptime: 1 hour, 4 mins Packages: 1857 (dpkg), 50 (flatpak), 33 (snap) Shell: bash 5.0.17 Resolution: 1920x1200 DE: GNOME WM: Mutter WM Theme: Adwaita Theme: Adwaita-dark [GTK2/3] Icons: Yaru [GTK2/3] Terminal: gnome-terminal CPU: AMD Ryzen Threadripper 1900X (16) @ 3.800GHz GPU: AMD ATI Radeon RX Vega 64 Memory: 3598MiB / 15930MiB </pre> </details> <details><summary>$ clinfo</summary> <pre> Number of platforms 1 Platform Name AMD Accelerated Parallel Processing Platform Vendor Advanced Micro Devices, Inc. Platform Version OpenCL 2.1 AMD-APP (3180.7) Platform Profile FULL_PROFILE Platform Extensions cl_khr_icd cl_amd_event_callback cl_amd_offline_devices Platform Host timer resolution 1ns Platform Extensions function suffix AMD Platform Name AMD Accelerated Parallel Processing Number of devices 1 Device Name gfx900 Device Vendor Advanced Micro Devices, Inc. Device Vendor ID 0x1002 Device Version OpenCL 2.0 AMD-APP (3180.7) Driver Version 3180.7 (PAL,HSAIL) Device OpenCL C Version OpenCL C 2.0 Device Type GPU Device Board Name (AMD) Radeon RX Vega Device Topology (AMD) PCI-E, 44:00.0 Device Profile FULL_PROFILE Device Available Yes Compiler Available Yes Linker Available Yes Max compute units 64 SIMD per compute unit (AMD) 4 SIMD width (AMD) 16 SIMD instruction width (AMD) 1 Max clock frequency 1107MHz Graphics IP (AMD) 9.0 Device Partition (core) Max number of sub-devices 64 Supported partition types None Supported affinity domains (n/a) Max work item dimensions 3 Max work item sizes 1024x1024x1024 Max work group size 256 Preferred work group size (AMD) 256 Max work group size (AMD) 1024 Preferred work group size multiple 64 Wavefront width (AMD) 64 Preferred / native vector sizes char 4 / 4 short 2 / 2 int 1 / 1 long 1 / 1 half 1 / 1 (cl_khr_fp16) float 1 / 1 double 1 / 1 (cl_khr_fp64) Half-precision Floating-point support (cl_khr_fp16) Denormals No Infinity and NANs No Round to nearest No Round to zero No Round to infinity No IEEE754-2008 fused multiply-add No Support is emulated in software No Single-precision Floating-point support (core) Denormals No 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 Global memory size 8573157376 (7.984GiB) Global free memory (AMD) 8306688 (7.922GiB) Global memory channels (AMD) 64 Global memory banks per channel (AMD) 4 Global memory bank width (AMD) 256 bytes Error Correction support No Max memory allocation 7059013632 (6.574GiB) Unified memory for Host and Device No Shared Virtual Memory (SVM) capabilities (core) Coarse-grained buffer sharing Yes Fine-grained buffer sharing Yes Fine-grained system sharing No Atomics No Minimum alignment for any data type 128 bytes Alignment of base address 2048 bits (256 bytes) Preferred alignment for atomics SVM 0 bytes Global 0 bytes Local 0 bytes Max size for global variable 6353112064 (5.917GiB) Preferred total size of global vars 8573157376 (7.984GiB) Global Memory cache type Read/Write Global Memory cache size 16384 (16KiB) Global Memory cache line size 64 bytes Image support Yes Max number of samplers per kernel 16 Max size for 1D images from buffer 134217728 pixels Max 1D or 2D image array size 2048 images Base address alignment for 2D image buffers 256 bytes Pitch alignment for 2D image buffers 256 pixels Max 2D image size 16384x16384 pixels Max 3D image size 2048x2048x2048 pixels Max number of read image args 128 Max number of write image args 64 Max number of read/write image args 64 Max number of pipe args 16 Max active pipe reservations 16 Max pipe packet size 2764046336 (2.574GiB) Local memory type Local Local memory size 65536 (64KiB) Local memory syze per CU (AMD) 65536 (64KiB) Local memory banks (AMD) 32 Max number of constant args 8 Max constant buffer size 7059013632 (6.574GiB) Preferred constant buffer size (AMD) 16384 (16KiB) Max size of kernel argument 1024 Queue properties (on host) Out-of-order execution No Profiling Yes Queue properties (on device) Out-of-order execution Yes Profiling Yes Preferred size 262144 (256KiB) Max size 8388608 (8MiB) Max queues on device 1 Max events on device 1024 Prefer user sync for interop Yes Number of P2P devices (AMD) 0 P2P devices (AMD) <printDeviceInfo:147: get number of CL_DEVICE_P2P_DEVICES_AMD : error -30> Profiling timer resolution 1ns Profiling timer offset since Epoch (AMD) 1603832704990059755ns (Tue Oct 27 22:05:04 2020) Execution capabilities Run OpenCL kernels Yes Run native kernels No Thread trace supported (AMD) Yes Number of async queues (AMD) 4 Max real-time compute queues (AMD) 1 Max real-time compute units (AMD) 0 printf() buffer size 4194304 (4MiB) Built-in kernels (n/a) Device Extensions cl_khr_fp64 cl_amd_fp64 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_int64_base_atomics cl_khr_int64_extended_atomics cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_fp16 cl_khr_gl_sharing cl_khr_gl_depth_images cl_amd_device_attribute_query cl_amd_vec3 cl_amd_printf cl_amd_media_ops cl_amd_media_ops2 cl_amd_popcnt cl_khr_image2d_from_buffer cl_khr_subgroups cl_khr_gl_event cl_khr_depth_images cl_khr_mipmap_image cl_khr_mipmap_image_writes cl_amd_copy_buffer_p2p 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 [AMD] clCreateContextFromType(NULL, CL_DEVICE_TYPE_DEFAULT) Success (1) Platform Name AMD Accelerated Parallel Processing Device Name gfx900 clCreateContextFromType(NULL, CL_DEVICE_TYPE_CPU) No devices found in platform clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU) Success (1) Platform Name AMD Accelerated Parallel Processing Device Name gfx900 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) Success (1) Platform Name AMD Accelerated Parallel Processing Device Name gfx900 </pre> </details> **Screenshot of the deb version of Darktable** ![Screenshot from 2020-10-27 23-29-45](https://user-images.githubusercontent.com/10299892/97369052-70bfed80-18ac-11eb-90a2-cbc514770e92.png)

Hope this helps others looking for a solution!

Cheers!