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DrJones

Post Screen/BIOS doesn't display with DisplayPort

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Posted · Original PosterOP

Hey guys, so I've looked all over the web and it seems people are having similar issues. I cannot see the post screen or get into the BIOS when using displayport. The monitor shows a black screen until it boots into Windows. Once in Windows I'm all good 1440p 144Hz with G-Sync.

HDMI works fine, able to see my post screen and RAID screen show up and enter the BIOS fine. It just won't do it with DisplayPort.

I'm using an X99 motherboard so no onboard graphics. Graphics are 2 GTX1070's in SLI. Monitor is PG279Q. Everything is updated: BIOS, chipset, drivers; it's a brand new system and this is my first time using displayport.

Is there a setting in the BIOS I'm not seeing to allow it to use DP 1.2?

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I've seen similar, but on HDMI

how I solved it: I had a 2nd monitor with DVI connections, removed the HDMI, powered on with the DVI monitor, after it went to Windows I plugged in the HDMI monitor and set it to primary then I shut down the PC and removed the DVI monitor

 

I have no idea what causes it

my guess is that the video card defaults to a predetermined output

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Posted · Original PosterOP
5 minutes ago, zMeul said:

I've seen similar, but on HDMI

how I solved it: I had a 2nd monitor with DVI connections, removed the HDMI, powered on with the DVI monitor, after it went to Windows I plugged in the HDMI monitor and set it to primary then I shut down the PC and removed the DVI monitor

 

I have no idea what causes it

my guess is that the video card defaults to a predetermined output

I did something similar to you in Nvidia Control panel to get it to use displayport in windows instead of HDMI. My monitor takes both displayport or hdmi. It was defaulting to hdmi. In Nvidia control panel, it actually showed up as two different monitors: one for displayport and one for HDMI. So I disabled the "monitor" using HDMI to force it to use displayport. Works fine in windows, but I can't get into the bios unless I switch inputs to HDMI. I'm trying to find a way to get into the BIOS using DisplayPort if possible.

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The issue is that NVidia cards prioritise the ports in this order. DVI -> HDMI - > DP

 

But depending on your motherboard and UEFI setup you can fix it.

 

I had a 2 monitor setup. My old 24" monitor on DVI ( in portrait mode to make matters worse!) and a 27" 2K on Display Port connected to my EVGA GTX 970. 
Motherboard is ASUS Z270-P but I know from others that this will work on other boards.

NOTE: You must have a UEFI setup, if you have an older legacy non-UEFI setup then this will not work.

If you don't have a UEFI setup I'm not sure what you can do other than to reinstall Windows in UEFI mode on a clean disk/partition. To be honest I would have done this anyway as it reduces boot time quite a bit.

The BIOS POST and setup screens would only ever show on the monitor connected via DVI. Apparently the graphics card prioritises the connections in this order 
DVI -> HDMI -> Display Port

After a while rotating my head to read the BIOS screen I decided enough was enough. After some research and trial and error I came across a very simple solution.

Anyway, to the point finally.
In the motherboard BIOS settings under the BOOT menu (on my board) there is an option called "CSM (Compatibility Support Module)". This is Enabled by default. Changing this to Disabled instantly fixed the issue. You may want to also try 'Auto' in case you have other non-UEFI devices connected but this may not work, it didn't for me.


Anyway, hope this helps somebody.

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Thanks Eggy1968

Worked for me and I understand it much better now.

BIOS compatibility mode was essential to get my non-uefi system drive recognised. Then conversion of the system drive to uefi using Microsoft tool MBR2GPT.exe (via run with admin permissions in the still running Win10 environment) went like a dream. Turning off Compatibility Mode again was the trick to get the display port graphics going in during the boot sequence.

Rob

 

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Ok guys I have a solution! I have been so flustered with this after getting my dual 2080ti setup. I run a 3 monitor 4 port set up with NVlink, 4th port is my capture device. I tried the above method of disabling the CSM, which did work in showing the bios boot on my display port monitor but then it would boot off my M.2 which is my operating system drive. So I tried this and it works flawlessly. 

 

Under your bios boot menu go to your "Boot from PCI-E/PCI Expansion Devices"

 

Select -> "UEFI Driver first" in the drop-down menu and you're done!

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On 2/14/2017 at 1:27 PM, Eggy1968 said:

Anyway, to the point finally.
In the motherboard BIOS settings under the BOOT menu (on my board) there is an option called "CSM (Compatibility Support Module)". This is Enabled by default. Changing this to Disabled instantly fixed the issue. You may want to also try 'Auto' in case you have other non-UEFI devices connected but this may not work, it didn't for me.

Just upgraded to a RX 580 8GB. I have a cheaper 1080p IPS monitor that I had connected previously with a VGA cable and a DP/VGA adapter. It all worked fine before with my GTX 750ti. Now I am not able to get to BIOS or my Boot Menu (very important for me as a workaround to some bad BSOD files). What's even stranger is when I connect a HDMI monitor with a HDMI connector, I get BIOS and Boot menu, but after Windows boots it switches to the DP/VGA monitor as main.

 

I tried the above mentioned method but to no success. Anyone else have ideas?

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On 9/20/2016 at 9:28 PM, DrJones said:

Hey guys, so I've looked all over the web and it seems people are having similar issues. I cannot see the post screen or get into the BIOS when using displayport. The monitor shows a black screen until it boots into Windows. Once in Windows I'm all good 1440p 144Hz with G-Sync.

HDMI works fine, able to see my post screen and RAID screen show up and enter the BIOS fine. It just won't do it with DisplayPort.

I'm using an X99 motherboard so no onboard graphics. Graphics are 2 GTX1070's in SLI. Monitor is PG279Q. Everything is updated: BIOS, chipset, drivers; it's a brand new system and this is my first time using displayport.

Is there a setting in the BIOS I'm not seeing to allow it to use DP 1.2?

Below solution is if you have connected a monitor to your motherboard or graphics card and are not able to go into BIOS because on turning on your PC, the first thing you see is windows OS. I have this working for the following interfaces: HDMI 1.4 graphics to HDMI 2.0 Monitor port, mDP graphics to DP monitor, mDP graphics to HDMI 2.0 monitor port.

 

This worked for me, run the optional steps too for better luck:

  1. Turn on your CPU
  2. Keep an eye on your keyboard/mouse light to know when your USB devices get powered. As soon as you see the keyboard/mouse light up, start pressing DEL
  3. Your CPU should now be going into BIOS although your monitor is still blank and not showing anything.
  4. (Optional) Wait for 10-20 seconds just to make sure it has entered the BIOS. To make sure the BIOS is up, pressing ALT+CTRL+DEL should restart the CPU. Repeat steps 2 and 3.
  5. (Optional) Press F9 then left arrow then ENTER to reset BIOS to defaults. Your PC will not restart after this.
  6. Press F10 then press ENTER.
  7. Your CPU should restart and now you should be able to see the BIOS option, hit DEL key to enter bios like usual.

 

My setup as far as this issue is concerned:

GIGABYTE 990FXA UD3 R5

Acer 32" 144Hz 1080p Curved connected via DP 1.2

MSI R9 280X connected via mDP/Thuderbolt-2

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