Kernel panic booting 5.10 from usb hdd

[bhargan]

I have installed 5.10 on an exteral usb hdd & get Kernel panic on boot.
System is:
HP ENVY 15t Quad
Product number: E2E34AV
• Windows 8.1 64
• 4th generation Intel(R) Core(TM) i7-4800MQ Processor
• NVIDIA(R) GeForce(R) 840M Graphics with 2048MB of dedicated video memory
• 15.6-inch diagonal Full HD BrightView LED-backlit Display (1920x1080)
• 12GB DDR3 System Memory (2 Dimm)
...

Boot error:
CALL TRACE
:video:acpi_video_bus_add...
acpi_get_handle...
acpi_bus_driver_init...
acpi_bus_register_driver...
:video:acpi_video_init...
sys_init_module
system_call

CODE...
RIP :video:acpi_video_device...
Kernel panic -not syncing

[TrevorH]

You almost certainly want to use 6.5 on a machine that new.

[bhargan]

I also had problems attempting to install 6.5 to an internal partition on this machine:
viewtopic.php?f=13&t=45732#p194228

5.10 matches the corporate enterprise distribution so it would be the ideal os to have