I am away on vacation and may not check back regularly, sorry in advance.
Is this only on LiveUSB? Have you installed to the SSD with acpi on and checked if it boots correctly?
If it is just the liveUSB it sounds like when you have acpi on it power cycles/changes the driver or something with the usb ports and causes the live USB to disappear while trying to boot from it.
Are you also booting UEFI or Legacy? That can change some of the answers.
I am away on vacation and may not check back regularly, sorry in advance.
Is this only on LiveUSB? Have you installed to the SSD with acpi on and checked if it boots correctly?
If it is just the liveUSB it sounds like when you have acpi on it power cycles/changes the driver or something with the usb ports and causes the live USB to disappear while trying to boot from it.
Are you also booting UEFI or Legacy? That can change some of the answers.