Question Intel CPU Integrated Graphics - Not Usable Now With W10


Aug 14, 2010
A few weeks ago I did a bios update on an Asus Prime Z490-A. After the update the system would not boot. The bios listed no bootable devices although it clearly saw my C: drive. After all too many hours of fruitless trouble shooting, including reloading the bios, I assumed (incorrectly) something in the bios got irreparably corrupted as it made no sense that it saw the drive but did not identify it as a bootable device. The drive booted fine in another machine so I was reasonably confident the drive and the W10 install on it were fine (this proved correct). At that point I gave up and, since its been three years since my last new build, I simply decided to accelerate what I already was planning and ordered an Asus Prime Z790, 13900k CPU, DDR5 memory, new case, etc. Today I assembled everything and the same problem occurred.

Again, after trouble shooting all day, I finally found a way of getting the new system to boot. I eventually got around to checking, the CSM (Compatibility Support Module) under the bios Boot tab. I found it disabled but greyed out so it was not possible to enable it and the UEFI bios. After doing the Google thing, I found a lot of others with a similar problem and someone wrote that by not using the CPU for graphics, and installing a graphic card, the CSM settings were no longer grayed out and it then became possible to launch CSM. So, I installed an EVGA graphics card I happened to have, enabled CSM, and the damn things now boots. Just to see what would happened, I removed the graphics card, the no bootable drive problem returned, and CSM was greyed out and not enabled.

I now have a big graphics card installed with very annoyingly noisy fans and creating a lot of heat I do not need. I do indeed strive for a ultra fast snappy machine but I do not run games and the Intel CPU graphics serves me fine.

It appears (quoting something I just found) "The Intel® 500 series chipset [and I infer all later versions] does not support UEFI VBIOS graphic card, hence the integrated graphics mode does not support legacy boot and CSM option becomes non-configurable". I saw some other references that seemed to justify Intel and Microsoft not having a need to continue to support legacy devices but I do not know enough for that to make sense to me. What I do now know is the latest greatest CPU (as all previous Intel CPUs) has integrated graphics that I cannot use if I want to boot into Windows. This just does not wash. Why then does Intel bother to include graphics in the CPU when most everyone uses Windows?

Would this problem exist if one did a clean W10 install? I saw something that slightly inferred this might be the case.

I would certainly appreciate some advice. At this point I do not know enough to do much more than only explain the problem but I have to believe there must be a way to use the CPU's integrated graphics feature as I have done for years.

Billy Tallis

Senior member
Aug 4, 2015
You probably just need to convert your existing Windows 10 installation to stop trying to boot using 16-bit BIOS mode and use UEFI booting instead. Most likely, your old system didn't have any components that needed to use the BIOS CSM but your motherboard had it on by default and you accidentally set up Windows the old way. Your new hardware definitely does not need the BIOS CSM enabled and there are several good reasons to want the CSM to stay disabled.

On Windows, the tool to convert from BIOS booting to UEFI booting is mbr2gpt. Or you can do a clean install with the CSM off to begin with.


Sep 7, 2001
If you disable Secure Boot first, save then reboot and enter BIOS again, the CSM option might be selectable. Or might not. Worth a shot.

I have an ASRock board (older) that removes access to entire boot device priority/order screen when Secure Boot is enabled. It's not greyed out, it disappears altogether. Disable Secure Boot and it comes back.