I can confirm this is still an issue.

My setup is:
Ubuntu 18.04
MSI GE60
Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
Intel HD 4600 + GeForce GTX 760M
nvidia-driver-396 (396.54-0ubuntu0~gpu18.04.1 from grphics-drivers PPA)
nvidia-prime for switching cards

With nvidia-drm.modeset=1 until some vulkan app is run as root the
vulkaninfo crashes like this:

==========
VULKANINFO
==========

Vulkan Instance Version: 1.1.82

ERROR: [Loader Message] Code 0 : /usr/lib/i386-linux-gnu/libvulkan_radeon.so: 
wrong ELF class: ELFCLASS32
ERROR: [Loader Message] Code 0 : /usr/lib/i386-linux-gnu/libvulkan_intel.so: 
wrong ELF class: ELFCLASS32
INTEL-MESA: warning: Haswell Vulkan support is incomplete
INTEL-MESA: warning: ../../../src/intel/vulkan/anv_device.c:1150: FINISHME: 
Implement pop-free point clipping



Instance Extensions:
====================
Instance Extensions     count = 17
        VK_EXT_acquire_xlib_display         : extension revision  1
        VK_EXT_debug_report                 : extension revision  9
        VK_EXT_debug_utils                  : extension revision  1
        VK_EXT_direct_mode_display          : extension revision  1
        VK_EXT_display_surface_counter      : extension revision  1
        VK_KHR_device_group_creation        : extension revision  1
        VK_KHR_display                      : extension revision 23
        VK_KHR_external_fence_capabilities  : extension revision  1
        VK_KHR_external_memory_capabilities : extension revision  1
        VK_KHR_external_semaphore_capabilities: extension revision  1
        VK_KHR_get_display_properties2      : extension revision  1
        VK_KHR_get_physical_device_properties2: extension revision  1
        VK_KHR_get_surface_capabilities2    : extension revision  1
        VK_KHR_surface                      : extension revision 25
        VK_KHR_wayland_surface              : extension revision  6
        VK_KHR_xcb_surface                  : extension revision  6
        VK_KHR_xlib_surface                 : extension revision  6
Layers: count = 3
=======
VK_LAYER_LUNARG_standard_validation (LunarG Standard Validation Layer) Vulkan 
version 1.0.82, layer version 1
        Layer Extensions        count = 0
        Devices         count = 2
                GPU id       : 0 (Intel(R) Haswell Mobile)
                Layer-Device Extensions count = 0
                GPU id       : 1 (GeForce GTX 760M)
                Layer-Device Extensions count = 0

VK_LAYER_VALVE_steam_overlay_32 (Steam Overlay Layer) Vulkan version 1.1.73, 
layer version 1
        Layer Extensions        count = 0
        Devices         count = 2
                GPU id       : 0 (Intel(R) Haswell Mobile)
                Layer-Device Extensions count = 0
                GPU id       : 1 (GeForce GTX 760M)
                Layer-Device Extensions count = 0

VK_LAYER_VALVE_steam_overlay_64 (Steam Overlay Layer) Vulkan version 1.1.73, 
layer version 1
        Layer Extensions        count = 0
        Devices         count = 2
                GPU id       : 0 (Intel(R) Haswell Mobile)
                Layer-Device Extensions count = 0
                GPU id       : 1 (GeForce GTX 760M)
                Layer-Device Extensions count = 0

Presentable Surfaces:
=====================
GPU id       : 0 (Intel(R) Haswell Mobile)
Surface type : VK_KHR_xcb_surface
Formats:                count = 2
        B8G8R8A8_SRGB
        B8G8R8A8_UNORM
Present Modes:          count = 3
        IMMEDIATE_KHR
        MAILBOX_KHR
        FIFO_KHR

VkSurfaceCapabilitiesKHR:
=========================
        minImageCount       = 2
        maxImageCount       = 0
        currentExtent:
                width       = 256
                height      = 256
        minImageExtent:
                width       = 256
                height      = 256
        maxImageExtent:
                width       = 256
                height      = 256
        maxImageArrayLayers = 1
        supportedTransform:
                VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR
        currentTransform:
                VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR
        supportedCompositeAlpha:
                VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR
                VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR
        supportedUsageFlags:
                VK_IMAGE_USAGE_TRANSFER_SRC_BIT
                VK_IMAGE_USAGE_TRANSFER_DST_BIT
                VK_IMAGE_USAGE_SAMPLED_BIT
                VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT

VkSurfaceCapabilities2EXT:
==========================
        supportedSurfaceCounters:
                None
GPU id       : 1 (GeForce GTX 760M)
Surface type : VK_KHR_xcb_surface
vulkaninfo: 
/build/vulkan-tools-WIuZIg/vulkan-tools-1.1.82.0+dfsg1/vulkaninfo/vulkaninfo.c:1253:
 AppDumpSurfaceFormats: Assertion `!err' failed.
Aborted (core dumped)


I have added some logs to vulkaninfo to check what is the value of 
vkGetPhysicalDeviceSurfaceFormatsKHR function that leads to abort and it is: -3
 (VK_ERROR_INITIALIZATION_FAILED)
According to specification this error value should not be returned by this 
function but here it is... 

On nvidia forum there is similar issue reported but unfortunately
without conclusion:
https://devtalk.nvidia.com/default/topic/998521/linux/no-vulkan-
applications-run-with-378-13-drivers-on-ubuntu-gnome-16-10-nvidia-
geforce-840m-gpu/

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to nvidia-graphics-drivers-390 in Ubuntu.
https://bugs.launchpad.net/bugs/1769857

Title:
  Vulkan not working if nvidia-drm.modeset=1 is set and gdm3 is used
  (Optimus)

Status in gdm3 package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-390 package in Ubuntu:
  Confirmed

Bug description:
  Lenovo ideapad 510-15IKB
  OS: Ubuntu 18.04 bionic
  Kernel: x86_64 Linux 4.15.0-20-generic
  DE: GNOME
  CPU: Intel Core i5-7200U @ 4x 3.1GHz
  GPU: Intel HD 620 + NVIDIA GeForce 940MX (Optimus)
  UEFI boot, Secure Boot disabled.

  I installed the proprietary graphics driver with Software Properties and 
Vulkan applications (e.g. vulkan-smoketest, Unreal Editor, SDK examples, 
Dolphin) were working fine.
  To get rid of tearing I added nvidia-drm.modeset=1 to 
GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, then ran update-grub && 
update-initramfs -u and rebooted.
  After doing that, Vulkan applications stopped working because they couldn't 
initialize the Vulkan swap chain until I reverted the changes to GRUB.

  Everything works as expected if lightdm is used instead of gdm3.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1769857/+subscriptions

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