FYI, I used 'lspci -nn' and got the following output for my HD4000 (Dell Latitude E6430):VGA compatible controller : Intel Corporation Ivy Bridge Graphics Controller [8086:0166] (rev 09)
I was assuming this would translate to device 01660009 and therefore I would be able to use IntelCapriFB=9. Didn't work. I tried all of the other values and surprisingly, "4" worked for me. So either the rev number has nothing to do with the platformID (in which case I wonder how you determine what the platformID is short of trying all 12 options) or something isn't working with entering the number.
Regardless, it's great that IntelCapriFB does get my video card working! Thanks for the feature!
Intel Corporation Ivy Bridge Graphics Controller [8086:0166] (rev 09)
(rev 09) is a "revision number 9°", nothing to do with ig-platform .
How to find the right?