X750 Pro4 - no video with CSM disabled

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   Hello,

I wanted to disable CSM from my BIOS settings to be able to enable "Above 4GB decoding" for video memory, which is basically SAM, but if I disable CSM I completely lose video output until the OS takes over. This also means that I can't see the BIOS configuration anymore and have to use the CMOS jumper to reset the mobo to factory settings.
My previous motherboard, an ASRock H77 Pro4/MVP, was working fine with CSM disabled with the same graphics card.

Here's my system specs:

AMD Ryzen 7 3700X
ASRock X570 Pro4
Sapphire Nitro+ RX580 SE
2x8GB Crucial DDR4-3600
2x512GB Samsung 850 Pro

Anyone known if there's any known bad UEFI interaction between my mobo and my graphics card?

Thanks!

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r1348 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 Dec 2020 Status: Offline Points: 4	Post Options Post Reply Quote r1348 Report Post Thanks(0) Quote Reply Topic: X750 Pro4 - no video with CSM disabled Posted: 11 Dec 2020 at 1:49am
	Hello, I wanted to disable CSM from my BIOS settings to be able to enable "Above 4GB decoding" for video memory, which is basically SAM, but if I disable CSM I completely lose video output until the OS takes over. This also means that I can't see the BIOS configuration anymore and have to use the CMOS jumper to reset the mobo to factory settings. My previous motherboard, an ASRock H77 Pro4/MVP, was working fine with CSM disabled with the same graphics card. Here's my system specs: AMD Ryzen 7 3700X ASRock X570 Pro4 Sapphire Nitro+ RX580 SE 2x8GB Crucial DDR4-3600 2x512GB Samsung 850 Pro Anyone known if there's any known bad UEFI interaction between my mobo and my graphics card? Thanks!

r1348 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 11 Dec 2020 Status: Offline Points: 4	Post Options Post Reply Quote r1348 Report Post Thanks(0) Quote Reply Posted: 11 Dec 2020 at 1:56am
	It looks like someone else is having the same issue with AMD ASRock mobos and Sapphire video cards: https://www.reddit.com/r/ASRock/comments/jes2x0/disable_csm/ https://www.reddit.com/r/ASRock/comments/gc4936/b450_itx_fatal1ity_bios_not_showing_up_after/