HA! I figured it out (for the Latitude e6410)! Download the Intel graphics drivers from Dell, extract it with 7zip or something, edit the file Graphicsboa64.inf:
This package provides the Dell P2312H Monitor Driver and is supported on Latitude, Precision, Vostro and OptiPlex models that are running the following Windows Operating Systems: XP, Vista and Windows 7. Download drivers for monitor for Dell Latitude 5490 laptop for Windows 7, XP, 10, 8, and 8.1, or download DriverPack Solution software for driver update. I have a laptop (dell latitude E6400) connected to an external monitor through docking station and I used to use both the screens. Of late my external monitor has stopped working and the screens. Feb 16, 2017 Some of Dell’s most popular products currently on the market include laptops such as the Dell Latitude 7480 and the XPS 13. / Motherboard Drivers for Dell Camera Drivers for Dell Card Reader Drivers for Dell CD / DVD Drivers for Dell Display / Monitor Drivers for Dell Game. It is a software utility that will find the right driver for.
find the section [Manufacturer] and change the following:
%Intel% = IntelGfx, NTamd64.5.1, NTamd64.6.0, NTamd64.6.2
[IntelGfx.NTamd64.5.1]
; no install on XP
[IntelGfx.NTamd64.6.2]
; no install on Win8
[IntelGfx.NTamd64.6.0]
[IntelGfx.NTamd64.5.1]
; no install on XP
[IntelGfx.NTamd64.6.2]
; no install on Win8
[IntelGfx.NTamd64.6.0]
to:
%Intel% = IntelGfx, NTamd64
[IntelGfx.NTamd64]
Go to Settings, Update & Security, Recovery, click 'Restart Now' under Advanced startup;
Choose Troubleshoot, Advanced Options, Startup Settings, click 'Restart';
Hit '7' (or whatever number says 'Disable driver signature enforcement';
Go to Device Manager (can be found in Control Panel), Expand 'Display adapters' and right click on 'Intel(R) HD Graphics' (or whatever it's calling your video card), and click 'Update Driver Software';
Click 'Browse my computer for driver software', click 'Let me pick from a list of drivers on my computer';
What Is A Monitor Driver
Click 'Have Disk' and browse to (where ever you extracted the drivers from Dell)Graphics ;
Pick Intel(R) HD Graphics and click 'Next'
This should install the drivers and make your laptop display work. You may have to disable automatic driver updates if you have trouble in the future. You can find instructions on how to do that by 'Google-ing' it.
Dell Latitude 7480 Display Drivers
Hope you find this helpful, as it took me a long time to figure it out. Thanks to all others troubleshooting this, as I would not have figured it out on my own!