darktable 3.0.2
Ubuntu 20.04
GeForce GTX 1650
Using NVIDIA driver metapackage from nvidia-driver 4.50
(had the same problems on version 4.40)

1. When I export NEF to JPG a few pictures always are exported as a small stripe of the picture on the left (in perfect quality), the much larger part at the right is black, while most pictures are exported correctly. The darktable-histories are equal (copied) on this try. The problem is reproduceable 100%, but disappears 100%, when OpenCL-support is disabled.

2. In tone equalizer: If I make the mask visible, the picture-area gets black. This seems to happen to every picture while OpenCL-support is enabled. The picture is shown again, when I switch off "display the exposure mask". This problem also is related to OpenCL-support=enabled and never comes up when disabled.

The problems came up after new installation of ubuntu. In ubuntu 18.04 (NVIDIA-driver version unknown) I never saw problems like this.

Thank you for darktable!!!
Stefan
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