OPenCL use disappeared

[Tim (Tim Cuthbertson)]

I installed a new Linux kernel (6.15.1) this morning and it occurred to me that I should check on the functioning of OpenCL. What I discovered was

Number of platforms 0

ICD loader properties
ICD loader Name OpenCL ICD Loader
ICD loader Vendor OCL Icd free software
ICD loader Version 2.3.3
ICD loader Profile OpenCL 3.0
[root@tux ~]# clinfo
Number of platforms 0

ICD loader properties
ICD loader Name OpenCL ICD Loader
ICD loader Vendor OCL Icd free software
ICD loader Version 2.3.3
ICD loader Profile OpenCL 3.0

So, at the OS level, OpenCL is installed, but it does not “see” darktable (and darktable is running).

When I go to darktable Settings >> Processing, section OpenCL GPU acceleration shows “activate OpenCL support” as “not available” and “OpenCL scheduling profile” as “not available”. Section OpenCL drivers shows “NVidia cuda” as checked.

OpenCL for darktable used to work on my system. I do not know when it stopped working. But, since it does not allow me to activate OpenCL support, what do I do?

[paperdigits (Mica)]

try renaming ~/.cache/darktable to ~/.cache/dartable-old or just removing it. This will nuke your thumbnails, but should also get rid of the compiled openCL kernels, which will need to be rebuilt.

[Tim (Tim Cuthbertson)]

Ok, it is rebuilding the thumbnails. I started darktable with “-d opencl”, but the setup properties are still showing that it will not allow me to activate openCL support.

My openCL packages are clinfo, ocl-icd, and opencl-nvidia. My system is completely updated.

I’ll start investigating from the Arch Linux side.

Thank you.

[g-man]

Try restarting the OS. Sometimes it helps with the nvidia drivers.

[Tim (Tim Cuthbertson)]

Ok, from looking at the darktable_old cache, the last time it cached a kernel for NVIDIACUDANVIDIAGeForceRTX2060 was June 6, which was the last 6.14 kernal installation date. Something did indeed change with today’s 6.15 kernel.

[Vulpy]

Half an hour ago, opencl-nvidia was updated. Maybe that’s the solution.

[kofa (István Kovács)]

Some ‘older’ Nvidia cards (like my 1060) are only supported by an nvidia package that has ‘server’ in the name. I’m sorry, I’m not at my computer.

Found it on the forum: it was nvidia-driver-550-server at the time.

Warning: Ubuntu 24.10 and older NVidia cards

Ubuntu 24.10 comes with the new, open-source Nvidia 560 drivers. That’s very nice, but the driver does not support older cards - see Video Card for a new build in 2024 - #13 by kofa. As my 1060 is not among the supported cards, darktable exhibited all kinds of weird behaviour, from OpenCL errors to crashes. One could, of course, always go back to the proprietary 550 series. Except… The nvidia-driver-550 package (and also 535 and others) are ‘transitional’ packages, basically depending on 560,…

Old Laptop: CPU vs. GPU Performance for Darktable and OpenCL

Which Nvidia driver do you have installed? On Ubuntu 24.10, I had to install install nvidia-driver-550-server to restore support for my older 1060 card. NVidia says you need a 390-series driver for the K2000M. You could try adding this PPA: Proprietary GPU Drivers : “Graphics Drivers” team, and install the older driver. It should give you the required pieces, see here: https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa/+sourcepub/15363115/+listing-archive-extra

[Tim (Tim Cuthbertson)]

Well, It is fixed, now. Although I had done a full system upgrade at 8 AM, I just did (12:30 PM) another one, and two of the opencl packages were upgraded. And now it’s all working, again.

Thanks for everyone’s input.

PS - I run the proprietary nvidia driver.

[paperdigits (Mica)]

@Tim

Although I had done a full system upgrade at 8 AM, I just did (12:30 PM) another one, and two of the opencl packages were upgraded. And now it’s all working, again.

classic arch linux!