With NVS-510, screen stuck at CLI console after switching to intel graphic and switching back to nvidia

[Gavin Lin]

Currently only see this on a machine with NVS-510.
Can reproduce with both 430.26 and 430.50 driver.
Screen stuck at CLI console after switching to intel graphic and switching back to nvidia.
The system still looks running, can access it through ssh or other CLI console.

Steps:
1. Install 18.04.3 desktop on a machine with Nvidia GK107 [NVS 510] [10de:0ffd].
2. Install nvidia-driver-430 package
3. Reboot
4. Switch to intel profile
   $ sudo prime-select intel
5. Reboot
6. Switch to nvidia profile
   $ sudo prime-select nvidia
5. Reboot

Expected result:
System boot into desktop correctly.

Actual result:
Screen stuck at CLI console.

Hardware infomation:
Model: Dell Precision Tower 7810
GPU: NVIDIA Corporation GK107 [NVS 510] [10de:0ffd] (rev a1)

[Gavin Lin (gavin.lin)]

Please find test report here:
https://drive.google.com/open?id=1DfY6Tt8jUjL2jkBIhxOIB9fsiohXxTJ_fotvGPHpwVg