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From: Nikos Chantziaras <realnc@gmail.com>
Subject: [gentoo-user] Re: "No CUDA device found" with nvidia-drivers newer than
 nvidia-drivers-396.24-r1(
Date: Wed, 15 Aug 2018 15:35:59 +0300
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On 15/08/18 15:02, tuxic@posteo.de wrote:
> Then I do an "emerge <new nvidia-driver-version>" and CUDA stops
> working. I do not change anything else nor do I know, who/what could
> disable CUDA on both cards ... except for the driver itsself.

Dumb question, but just to be sure: did you reboot after upgrading the 
driver? The driver never worked for me correctly, unless I reboot. 
Unloading the driver with "modprobe -r" and loading the new one doesn't 
work correctly, only rebooting does.