I’m running my development machine on a GTX 690 with three 1920x1080 monitors, set up as a BaseMosaic between the left screen and a TwinView pair of the center and right screens.
This setup works perfectly in OpenGL.
However, any attempts to use Vulkan result in long freezes of the entire desktop’s rendering, which sometimes recovers after a few tens of seconds. It doesn’t matter which Vulkan application I try - even Steam’s startup freezes for about 10 seconds while checking for Vulkan support.
For sanity checking, I’ve switched off BaseMosaic and Vulkan appears to work fine in that configuration. Unfortunately, I lose a monitor in the process. This means it’s clearly an interaction between BaseMosaic and Vulkan. This behavior has remained constant over 2 CPU upgrades and a half-dozen different NVIDIA driver versions since the first experimental Vulkan releases.
I would really like this bug fixed, as it is making it impossible for me to develop for Vulkan at this time.