What is CSM and do I need it enabled?

**gupsterg** · 06-17-2018 08:27 AM

Originally Posted by ExGreyFox

That being said if I were installing Windows 10 on a 970Evo 500GB NVMe M.2 in a ROG Maximus X Formula, would I need to change CSM to disabled and then under secure boot chnage the OS type to "other type" and clear secure boot keys?

When you change the OS type to " Other Type" the secure boot keys will be "Unloaded" thus not apply.

You can installed Win 10 with CSM enabled or not.

**ukasyah_rz** · 03-05-2019 11:11 AM

Originally Posted by JustinThyme

I cant speak directly from your board but on a similar buid 7700K and M9F I had to leave the CSM enabled to get it to boot from the USB. Dont remember having issues later setting to disabled. When windows wont boot on any issue like this whats worked for me is to go back a step, let windows boot, reboot to safe mode, then turn CSM off and save and exit. Then it willl boot in safe mode. restart...done

If u use Rufus for bootable, there is option for UEFI CSM or UEFI Non-CSM.

**emsir** · 07-15-2019 08:05 PM

Originally Posted by Chino

If I recall correctly, you must disable CSM before installing Windows 10. If you installed Windows 10 with it on, then it won't let you disable it.

Not true. You can disable CSM anytime you like, and enable it too.

**npapanik** · 10-21-2019 10:58 AM

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?

**jamith** · 10-31-2019 01:04 AM

Originally Posted by npapanik

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?

Asus ROG strix B350-F with BIOS 5220, I have the same situation, Im unable to get to the BIOS after disabling CSM.

**mBrane** · 07-16-2020 07:11 PM

Originally Posted by jamith

Asus ROG strix B350-F with BIOS 5220, I have the same situation, Im unable to get to the BIOS after disabling CSM.

Try an HDMI cable at bootup, if you're using DisplayPort. I do this, then switch to DP after Windows boots (I have a different issue, but have found this to work when system is POSTing and you're having video issues). Good luck!

**pam007** · 07-20-2020 09:15 PM

Originally Posted by mBrane

Try an HDMI cable at bootup, if you're using DisplayPort. I do this, then switch to DP after Windows boots (I have a different issue, but have found this to work when system is POSTing and you're having video issues). Good luck!

I found the opposite to be true with my configuration. With a Crosshair VIII Hero X570 and a RTX 2080 Super, with CSM disabled (by default) it won't POST when connected to HDMI. It boots perfectly fine connected to DisplayPort. It will boot via HDMI only when CSM is enable, but you need a DP monitor to be able to access the UEFI. Ask me how I know: https://rog.asus.com/forum/showthrea...RTX-2080-Super

After investigating, this DP/HDMI with CSM enabled/disabled issue is a bug that occasionally pops up with select ASUS motherbords and video card configs. As of this date, I've been able to validate this is currently happening across the Crosshair and Strix X570 motherboards. IMO, ASUS needs to finally fix this issue once and for all, especially as HDMI displays start becoming more popular as HDMI 2.1 video cards start rolling out.

**panosvasilakis** · 03-13-2021 11:20 AM

Originally Posted by npapanik

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?

**Jesseinsf** · 03-13-2021 11:32 AM

Originally Posted by panosvasilakis

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.

**geneo** · 03-14-2021 02:42 AM

Originally Posted by otec

So, if its there for compatibility reasons, how come my Windows 10 boots from a non EFI m.2 drive without any problem with CSM is disabled?

Mostly there for non-EFI devices (like video cards without EFI GOP drivers). Also it will need to be disabled if you want to do secure boot, which requires full EFI.

gupsterg PC Specs
Motherboard	Asus Maximus VII Ranger
Processor	i5 4690K
Memory (part number)	HyperX Savage 2400MHz 16GB
Graphics Card #1	Sapphire R9 Fury X (1145/545 Custom ROM)
Monitor	Asus MG279Q
Storage #1	Samsung 840 Evo 250GB
Storage #2	HGST 2TB
CPU Cooler	ThermalRight Archon SB-E X2
Case	Silverstone Temjin 06
Power Supply	Cooler Master V850
Headset/Speakers	HyperX Cloud
OS	Win 7 Pro x64 / Win 10 Pro x64

npapanik PC Specs
Motherboard	Asus PRIME X470-PRO
Processor	AMD Ryzen 3600
Memory (part number)	Corsair VENGEANCE LPX (CMK16GX4M2B3200C16)
Graphics Card #1	ROG Strix RX VEGA56
Monitor	Dell SE2717H
Storage #1	Samsung 960 Evo 500Gb
CPU Cooler	Noctua NH-D15S
Case	bequiet! Dark Base 700
Power Supply	Coolermaster Silent Pro M850W
Keyboard	Razer BlackWidow Ultimate 2014
Mouse	Razer Deathadder Elite
Headset	Razer Electra v2 USB
OS	Windows 10 Pro x64
Network Router	Synology RT2600ac

jamith PC Specs
Motherboard	Asus ROG STRIX B350-F
Processor	AMD Ryzen 5 1600
Memory (part number)	F4-3200C16D-16GVKB
Graphics Card #1	PNY GeForce GTX 1060 XLR8 Gaming OC
Monitor	LG 25UM58P 25.0" 2560x1080 75Hz
Storage #1	SanDisk SSD PLUS 240GB
Storage #2	WD Caviar Blue 1TB 3.5" 7200RPM
Case	NZXT S340 ELITE BLACK + RED
Power Supply	Corsair TXM Gold 550W 80+ Gold
Keyboard	HyperX Mars RGB Mechanical
Mouse	Logitech G602 Wireless
Mouse Pad	Corsair MM300 Extended Edition

mBrane PC Specs
Motherboard	ASUS RIVE
Processor	3930K @ 4.4 GHz
Memory (part number)	Corsair Dominator (liquid-cooled)
Graphics Card #1	GTX 680 Hydro Copper
Graphics Card #2	GTX 680 Hydro Copper
CPU Cooler	EK blocks on CPU, NB, SB, and VRMs
Case	Corsair Obsidian 800D
Power Supply	Corsair 1200AXi
Mouse	Logitech G502
Headset	Logitech G933
OS	Windows 10 Pro x64

pam007 PC Specs
Motherboard	system #1 ASUS Rampage V E10 X99 , system #2 Maximus X Hero Z370
Processor	#1 i7-6950X , #2 i7-8700K
Memory (part number)	#1 G. Skill Ripjaw DDR4-3200 16GB , #2 G. Skill Ripjaws DDR4-2666 16GB
Graphics Card #1	#1 and #2 EVGA GTX 1080 ti FTW3
Monitor	#1 Acer 34" X34P Preditor , #2 50" 7100 Samsung TV
Storage #1	#1 and #2 Samsung 970 EVO 1TB
CPU Cooler	#1 and #2 EK Supremacy EVO waterblock
Case	#1 Thermaltake Core X9 , #2 Corsair Air 540 Cube Case
Power Supply	#1 EVGA G2 850 , #2 Corsair HXi-850 850 watts
OS	#1 and #2 Windows 10 64-bit

Thread: What is CSM and do I need it enabled?

Thread Tools

Search Thread

Display

Try an HDMI cable at bootup

disabled CSM in the BIOS, I cannot get into BIOS

Posting Permissions

Jesseinsf PC Specs
Motherboard	ASUS ROG Maximus XI Extreme (Z390)
Processor	Intel Core i9 9900K
Memory (part number)	Corsair CMW128GX4M4E3200C16 - 128GB (4x32)
Graphics Card #1	NVIDIA - GeForce RTX 3080 Ti Founders Edition
Sound Card	Onboard TOSLINK to powered speakers
Monitor	MSI Creator PS321URV (32 in 4k HDR600)
Storage #1	Samsung 980 Pro M.2 PCIe SSD 1TB
Storage #2	Samsung 970 Pro M.2 PCIe SSD 1TB
CPU Cooler	ASUS ROG Strix LC II 360 AIO (3x LIAN LI UNI FAN SL INFINITY 120)
Case	Lian Li PC-011 Dynamic XL Black (ROG Certified)
Power Supply	Seasonic - PRIME TX-1000 (80+ Titanium) - New version that doesn't trip from transient spikes
Keyboard	RAZER HUNTSMAN ELITE - LINEAR OPTICAL SWITCH (Red) w/ PBT Keycaps
Mouse	Razer Basilisk Ultimate with Charging Dock
Headset	Bowers and Wilkins P9 Signature
Mouse Pad	LOFTMAT (16x13 inch) Cushioned Gaming Mat - "The Gaming Slim"
Headset/Speakers	Vanatoo Transparent One Encore with Rel HT/1003 Subwoofer
OS	Windows 11 Pro for Workstations 64-bit
Network Router	RAXE500 — Nighthawk AX12 12-Stream AXE11000 Tri-Band Wi-Fi 6E Router
Accessory #1	Microsoft Xbox Elite Wireless Controller Series 2
Accessory #2	2x Logitech BRIO ULTRA HD PRO WEBCAM
Accessory #3	10 LIAN LI UNI FAN SL INFINITY 120 (Includes AIO fans)

geneo PC Specs
Laptop (Model)	13" Macbook Pro M1
Motherboard	ROG Maximus XIII Hero (WiFi)
Processor	i9-10900k 5.2 GHz AVX0 all core, 1.28v
Memory (part number)	32 GB G.Skill TridentZ RGB 3200/CL14 @ 4100 16-16-34
Graphics Card #1	Asus ROG Strix 2070 Super A8G
Sound Card	On-board
Monitor	EIZO Coloredge CG2730 and Viewsonic QHD displays
Storage #1	WDC SN850 1TB, Samsung 980 1TB
Storage #2	1TB 850 x 1 TB 860 EVO RAID0, 6 TB WDC Black, 6TB IronWolf Pro
CPU Cooler	EK-AIO 360 D-RGB w/Phanteks T30 -120 fans, 1 Noctua Chromax 140 case fan
Case	Fractal Design Meshify 2 dark tint
Power Supply	750W Seasonic Prime Ultra Titanium Plus
Keyboard	Glorious GMMK TKL
Mouse	Logitech G305
Headset	Bose QC15
Headset/Speakers	Vanatoo T1, Klipsch R-12SWi Sub
OS	Windows 11 Pro X64
Network Router	Linksys EA7300
Accessory #1	Logitech c920e webcam
Accessory #2	Sabrent DS-SC5B 5-Bay USB-C HDD docking station
Accessory #3	xrite i1 Display monitor calibration