I have the same problem with a Dell Latitude D810. With AC power, hibernation works. Without AC power, the system freezes. Turning off laptop mode and waiting for 5 minutes doesn't help.
This is also reported as Bug #40034 on acpi-support.
I have the same problem with a Dell Latitude D810. With AC power, hibernation works. Without AC power, the system freezes. Turning off laptop mode and waiting for 5 minutes doesn't help.
This is also reported as Bug #40034 on acpi-support.