- Joined
- Nov 4, 2016
- Messages
- 182
- Motherboard
- Asus X299 Prime Deluxe - Clover
- CPU
- i9-7900X
- Graphics
- GTX 1080 TI + Vega 56
In my BIOS I have the following settings under CSM when I set it to enabledSo – like on your machine – with CSM disabled I get black screen with more than one screen connected while booting.
If I however enable it, I can't even get past that line while booting...
Launch CSM: Enabled
Boot Device Control: UEFI and Legacy OPROM
Boot from Network Devices: UEFI Driver first
Boot from Storage Devices: UEFI Driver first
Boot from PCI-E/PCI Expansion Devices: UEFI Driver first
I also just tried CSM = Auto and still could boot with the monitors connected. I will set it to disable and check if my problem comes back.
One point - my main monitor is connected via D-DVI and my secondary monitor is HDMI. With CSM disabled - boot and BIOS is always on the HDMI, where as with CSM enabled, boot and BIOS is on the D-DVI monitor.
EDIT: Yeah I set my CSM to disabled and the no signal monitor problem happened when booted into High Sierra. For me - I must set CSM to Auto or Enabled
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