Hi, after upgrading to nvidia-drivers-396.51 no CUDA devices were found. Last version, which works for me is nvidia-drivers-396.24-r1.
The problem was detected first while using Blender which normally renders on GPU but falls back to CPU rendering then (jawn!). I submitted a bug report to the blender devs and Brecht van Lommel pointed me to the tool http://cuda-z.sourceforge.net/. After installing that it shows that there are CUDA devices detectable with the old driver and none with all drivers newer than that. So it is no blender related problem. libcuda is installed with both versions of the driver and checked for being of the currently installed version. How can I fix that? Description of the hardware/software, which was used: Hardware: ASUS Crosshair IV Formula motherboard CPU : AMD Phenom(tm) II X6 1090T Processor 8 GB Dual channel RAM The system is NOT overclocked. Two Nvidia-cards are installed. One for the desktop and one for Blender alone: 02:00.0 VGA compatible controller: NVIDIA Corporation GM206 [GeForce GTX 960] (rev a1) (Desktop) 07:00.0 VGA compatible controller: NVIDIA Corporation GP108 [GeForce GT 1030] (rev a1) (Blender) Software: Linux kernel 4.18.00 currently. The same problem was arises with older kernels (4.17 ..). Gentoo is updated daily. Cheers! Meino
