Public bug reported:

After installing Ubuntu 18.10 and the Nvidia driver + Vulkan-Utils,
switching to NVIDIA and then running vulkaninfo or vulkan-cube works
perfectly.

But when you reboot and update, then switch to Intel, then back to Nvidia, all 
Vulkan programs give an 
"Assertion `!err' failed."

Vulkaninfo:

=======
Presentable Surfaces:
=====================
GPU id       : 0 (GeForce GTX 960M)
Surface type : VK_KHR_xcb_surface
vulkaninfo: 
/build/vulkan-tools-ZnxIl9/vulkan-tools-1.1.82.0+dfsg1/vulkaninfo/vulkaninfo.c:1253:
 AppDumpSurfaceFormats: Assertion `!err' failed.
Annullato (core dump creato)


Vulkancube:
vulkan-cube: 
/build/vulkan-tools-ZnxIl9/vulkan-tools-1.1.82.0+dfsg1/cube/cube.c:3416: 
demo_init_vk_swapchain: Assertion `!err' failed.
Annullato (core dump creato)


I still have not found a workaround for that, the only way to get it working 
again is to reinstall everything. 

- Install Ubuntu 18.10
- Install proprietary 390 NVIDIA drivers
- Switch NVIDIA-Prime to NVIDIA
- Testing the vulkan capabilities works
- Updating the system then switching to intel
- Reboot
- Switch to nvida
- Now all Vulkan programs when using NVIDIA give that error

** Affects: nvidia-drivers-ubuntu
     Importance: Undecided
         Status: New

** Affects: nvidia-prime (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: nvidia-drivers-ubuntu
   Importance: Undecided
       Status: New

** No longer affects: xserver-xorg-video-intel (Ubuntu)

** Also affects: nvidia-prime (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1800465

Title:
  Vulkan error when using NVIDIA-Prime

Status in NVIDIA Drivers Ubuntu:
  New
Status in nvidia-prime package in Ubuntu:
  New

Bug description:
  After installing Ubuntu 18.10 and the Nvidia driver + Vulkan-Utils,
  switching to NVIDIA and then running vulkaninfo or vulkan-cube works
  perfectly.

  But when you reboot and update, then switch to Intel, then back to Nvidia, 
all Vulkan programs give an 
  "Assertion `!err' failed."

  Vulkaninfo:

  =======
  Presentable Surfaces:
  =====================
  GPU id       : 0 (GeForce GTX 960M)
  Surface type : VK_KHR_xcb_surface
  vulkaninfo: 
/build/vulkan-tools-ZnxIl9/vulkan-tools-1.1.82.0+dfsg1/vulkaninfo/vulkaninfo.c:1253:
 AppDumpSurfaceFormats: Assertion `!err' failed.
  Annullato (core dump creato)

  
  Vulkancube:
  vulkan-cube: 
/build/vulkan-tools-ZnxIl9/vulkan-tools-1.1.82.0+dfsg1/cube/cube.c:3416: 
demo_init_vk_swapchain: Assertion `!err' failed.
  Annullato (core dump creato)

  
  I still have not found a workaround for that, the only way to get it working 
again is to reinstall everything. 

  - Install Ubuntu 18.10
  - Install proprietary 390 NVIDIA drivers
  - Switch NVIDIA-Prime to NVIDIA
  - Testing the vulkan capabilities works
  - Updating the system then switching to intel
  - Reboot
  - Switch to nvida
  - Now all Vulkan programs when using NVIDIA give that error

To manage notifications about this bug go to:
https://bugs.launchpad.net/nvidia-drivers-ubuntu/+bug/1800465/+subscriptions

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