B450: Full HD BIOS not working with disabled CSM

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   Hello,

on my Fatal1ty B450 Gaming-ITX/ac motherboard and 5.20 BIOS, the Full HD BIOS option is not working when I disable CSM. This is unfortunate, as CSM needs to be disabled for Secure Boot to be enabled. I have an Nvidia RTX 2070 GPU and the Gigabyte M34WQ monitor is connected via DisplayPort. With Full HD BIOS set to Auto, the resolution is 1920x1080 with CSM mode enabled but only 1366x768 with it disabled.
I found this thread:
https://forum.asrock.com/forum_posts.asp?TID=3108&PN=2&title=wrong-resolution-in-uefi-setup-menu
but it mentions that disabling CSM fixes the resolution issue, not breaks it.

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belegdol Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 27 Dec 2022 Status: Offline Points: 35	Post Options Post Reply Quote belegdol Report Post Thanks(0) Quote Reply Topic: B450: Full HD BIOS not working with disabled CSM Posted: 27 Dec 2022 at 7:27pm
	Hello, on my Fatal1ty B450 Gaming-ITX/ac motherboard and 5.20 BIOS, the Full HD BIOS option is not working when I disable CSM. This is unfortunate, as CSM needs to be disabled for Secure Boot to be enabled. I have an Nvidia RTX 2070 GPU and the Gigabyte M34WQ monitor is connected via DisplayPort. With Full HD BIOS set to Auto, the resolution is 1920x1080 with CSM mode enabled but only 1366x768 with it disabled. I found this thread: https://forum.asrock.com/forum_posts.asp?TID=3108&PN=2&title=wrong-resolution-in-uefi-setup-menu but it mentions that disabling CSM fixes the resolution issue, not breaks it.

klaro923 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 29 Dec 2022 Status: Offline Points: 30	Post Options Post Reply Quote klaro923 Report Post Thanks(1) Quote Reply Posted: 29 Dec 2022 at 6:02pm
	Hi, I also have the same Board witch CSM off and when i switch off the ASRock Logo screen (to have the conventional windows logo instead of ASRock), this is also low resolution. Going back to 4.80 fixes this. I have opened a support ticket for that and was told that this was given to the ASRock BIOS department. Maybe you should also contact support so they have more "complaints" and so a fix could be more reasonable.

belegdol Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 27 Dec 2022 Status: Offline Points: 35	Post Options Post Reply Quote belegdol Report Post Thanks(0) Quote Reply Posted: 30 Dec 2022 at 7:38pm
	I have sent a report via the support page, let's see if it helps.