Unless the sellers will talk to you about this and will accept returns.
I know of no maker that publishes these specs so you may have to call each maker and explain your needs.
Then again, most folk use common laptops for this such as noted and suggested by one of the digital audio houses such as Motu and others.
If you look around no one goes near a post like yours. http://forum.notebookreview.com/what-notebook-should-i-buy/443179-digital-audio-workstation-wanted-work-motu-8pre-via-firewire-ti-chipset.html
Laptops change too quickly for anyone to stand behind a model.
--> Let MOTU offer suggestions.
Looking for a good laptop for a mobile recording studio. It needs to have the following.
1. Ability to ingerface to external soundcard (motu 8pre) using either of
the two options: a) "Texas Instruments Ieee 1394 port or b) an "Intel
2. Ability to achieve consistent low latency levels say 200ms or less with
spikes not in the red or above 800ms
3. Ability to access SpeedStep, HEPT, C1E, & Power Control settings
and the like within the BIOS for controlling the latency.
Please respond with your laptop model if it has either or any of the features of items 1 or 3 above. Please also respond with your latency levels if you have run them, it would be nice if you can post an image of the reading as well if you are able to do so.