Yesterday, NVIDIA again updated their special beta Vulkan driver pushing it to version 415.22.01 with various improvements. This is the driver where the add in and test new Vulkan features first, before putting them into their main drivers. Usually, you would want to stick with their normal driver series.
Included in this release are fixes for vkCmdDrawIndirectCountKHR and vkCmdDrawIndexedIndirectCountKHR in regards to "very large counts". Another fix made it in for Sascha Willems' "pushconstants" example (a bunch of Vulkan API examples and demos).
Additionally, it's now exposing two transfer queues on Pascal and above, the maximum point size has increased to 2047 and the maximum line width has increased to 64. See the NVIDIA Vulkan driver page for the info.
They also did a minor update to their main driver, with version 415.23 now out which fixes a build failure for the Linux Kernel 4.20.
It's good to see NVIDIA keep pushing their Linux drivers, they've come a long way in the years I've been using Linux. Quite rare to actually come across an NVIDIA-specific driver bug in games.