i can write 10 paragraphs about this but will try to keep it short and wont even bother with the chipsets thing.. as its pretty moot at this point. (the older cardbus on many better laptops the chipset used was TI, cheaper ones used others, things are a little different with Express but still have a bridge)

there are multiple issues with new laptops. they are designed for long battery life and pull every power saving trick in the book they can to get that long battery life
add to that the whole "green" nonsense..

add to that that windows itself is also guilty of the power saving nonsense.
part of the power saving is cutting voltages at every turn with windows even turning off usb ports not in use or that may have something plugged in but not in use.
the Express slot is oft times undervolted as well even when it has something active.

Cstates in the bios with all laptops/desktops they are all on by default these can and will cause issues for audio (DPC)
with desktops you can turn them off with most laptops you have no control

so 2 main issues lack of power/low power and c state.
all this turning on and off creates many issues.

added 3rd party chipset create even more with jmicron being one of the worst (and most commonly used)
Ricoh, o2r and others are not much better. (card reader, firewire if any, and other chipsets.)

then you have the manufacturer's expected end user use. most of them, particularly in the budget realm do not expect any laptop to used as a workstation but more as a get on the internet or do office work or oddly play movies or games.  far from a pro level audio device.
so the way they program the bios is lazy and sloppy.

you might get lucky and find a laptop that will actually work with an RME express card (rme has the best potential of anyone)
i have heard of a few people using name brand laptops with the Madiface.
not many, nor do i recall what models.

some things to try
disable ACPI battery, fingerprint thing if there is one
disable all wifi/lan (we had to physically remove the wifi card in 2 of our models as even disabling it didn't work)
ugly VGA mode for the video (last resort)
there is at least another 40 things... but without control over the bios or custom bios good luck with that...

Scott
ADK