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What is CSM and do I need it enabled?

otec
Level 7
Hi,

Can anyone please explain what is CSM setting in BIOS and why do I need to have it enabled?

I'm running M.2 Samsung 950 as a boot driver with Windows 10.

Currently I don't use EFI boot partition, as I can't still figure out how to mark it as boot and rebuild bcd (when I reinstalled windows from old hard drive, I forgot to disable old EFI partition).


Thank you!
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21 REPLIES 21

npapanik wrote:
My config:
- Asus Prime X470-PRO with latest BIOS (5220)
- Asus ROG Strix RX VEGA56

My problem is that when I disable CSM support in the BIOS, I cannot get into BIOS again whatever I do, SHIFT+restart in Windows 10 or press DELETE or F2 at boot sequence. When I do these two actions my monitor (Dell SE2717H connected via HDMI) pops up a message that the resolution is not supported! So it seems that the system is in the BIOS screen but the output resolution is wrong...

Note that Windows are working perfectly OK, its just that I cannot get to BIOS. If I reset the CMOS I am able to get to BIOS again but CSM is Auto in the default BIOS settings.

I am the only one having this?


I have the same exact problem, i have Asus x570-e and Samsung tv q80t, both with last firmware, the default on BIOS is CSM disable. The tv shows that the resolution is not supported. I have another tv LG 32LK6200 where i can see the bios, in Samsung i have to enable the CSM to work . I try to search in forums what is going, not luck. You are the first person i found with tis problem. Is there an solution? if i leave the CSM enabled will be a problem?

panosvasilakis wrote:
I have the same exact problem, i have Asus x570-e and Samsung tv q80t, both with last firmware, the default on BIOS is CSM disable. The tv shows that the resolution is not supported. I have another tv LG 32LK6200 where i can see the bios, in Samsung i have to enable the CSM to work . I try to search in forums what is going, not luck. You are the first person i found with tis problem. Is there an solution? if i leave the CSM enabled will be a problem?

Switch over to AMD and become a continuous never-ending BETA tester. This also sounds very familiar with Linux users trying to get things to work right.