(Solved) darktable 3.6.1 lost OpenCl functionality while exporting images. How to recover?

[LateJunction (Anthony A Hamilton)]

Thanks for this; I would never have found this package for myself: searching flathub with the argument ‘nvidia’ , or any subset of the flatpak name, does not list it.

I finally found which version (out of the 198 choices) I needed. Flatpak informed me that it is already installed - so it seems that this driver package does not fix the issue of OpenCL failing to survive a ‘suspend/resume’ cycle (of Mint 20.2, Cinnamon, at least) with the Flatpak version of dt 3.6.1 (just as the OBS version).

[Brian_Innes]

@LateJunction

I would like to follow up on this:
Having noted your comment on problems with OpenCL availability after suspending Mint 20.2 when using the Flatpak version of dt, I made sure of closing dt before suspending Mint, even though I am now using the OBS version (3.6.1-1.1) of dt. Finding this to somewhat defeat the purpose of ‘suspend’, I tried it without closing dt first; result: OpenCL availability stull gets broken over a ‘suspend/resume’ cycle on both my Mint 20.2 installs when using the OBS version of 3.6.1.

I cannot tell if this is a problem with the hardware, chosen BIOS settings, nVidia drivers, Mint (Cinnamon) , dt or me (it’s usually me…). Should I submit a bug report? Nobody seems to have done so, when I examine the Issues register on Github. I find this remarkable - I guess that the majority of dt users run the Linux version, and Mint is probably in the top 3 distros used by dt users - so it can’t just be me, surely?

From what I’ve seen it’s more an issue with Nvidia OpenCL kernel modules, and power saving.

Try this, on the linux mint forum:

sudo rmmod nvidia_uvm
sudo modprobe nvidia_uvm

https://forums.linuxmint.com/viewtopic.php?f=59&t=267454