Title almost says it all. All is well when the laptop is plugged in but fails to boot when running on battery power. After selecting Ubuntu in the Grub menu the laptop never gets to the login screen and freezes with a black screen. Sometimes I see a screen full of garbage and then a frozen black screen. Fans running full speed. I use acpi=off in Grub because without it, the machine won't even boot when plugged in.
This is a dual boot system and Windows 10 boots and works just fine.