GPU won't post w/ CSM Disabled

[walkthewalk]

Looking to upgrade to Win 11, and need to enable secure boot. When I enable secure boot in my BIOS, it turns off CSM, which causes my GPU not to post. Had to pop out the battery on the MB and clear CMOS to get my PC booted back up. Does anyone know how to get my GPU to post with CSM turned off?

 

GPU: RX 580 - Sapphire Radeon Pulse 4GB

 

MB: GIGABYTE Z390 AORUS PRO Wi-Fi

 

[xAcid9]

Probably BIOS related? Try update to a newer one?
Make sure you backup the original BIOS. 

[walkthewalk]

20 minutes ago, xAcid9 said:

Probably BIOS related? Try update to a newer one?
Make sure you backup the original BIOS. 

Running the F12j BIOS which is the most current version.

[Zando_]

31 minutes ago, walkthewalk said:

Looking to upgrade to Win 11, and need to enable secure boot.

Hope this isn't your main rig, Windows 11 is in dev channel currently, will have a lot of stability issues.

Try running DDU to uninstall the GPU drivers then shut down. Enable Secure Boot, see if Windows will use its generic VGA drivers and work, could be something with the AMD drivers not liking the swap from CSM to non-CSM. If it won't boot with the basic display drivers, try with your CPU's iGPU assuming you don't have an F chip, then install the GPU drivers once you get windows booting.

[walkthewalk]

5 minutes ago, Zando Bob said:

Hope this isn't your main rig, Windows 11 is in dev channel currently, will have a lot of stability issues.

Try running DDU to uninstall the GPU drivers then shut down. Enable Secure Boot, see if Windows will use its generic VGA drivers and work, could be something with the AMD drivers not liking the swap from CSM to non-CSM.

It actually does not even get to the point of booting up the operating system. It fails to post the GPU at all. The "VGA" status LED lights up.

 

[Zando_]

1 minute ago, walkthewalk said:

It actually does not even get to the point of booting up the operating system. It fails to post the GPU at all. The "VGA" status LED lights up.

If you don't have an F chip, yank the GPU and see if windows will boot when using the iGPU. Removing as many variables as possible always helps when troubleshooting.

[xAcid9]

20 minutes ago, walkthewalk said:

Running the F12j BIOS which is the most current version.

I mean your RX580. 

 

If it come with Dual BIos, switch to the 2nd one. 

[walkthewalk]

8 minutes ago, Zando Bob said:

If you don't have an F chip, yank the GPU and see if windows will boot when using the iGPU. Removing as many variables as possible always helps when troubleshooting.

Please forgive me, but not exactly sure how this would help me. I don't want to use integrated graphics, I want to use my GPU. 

 

I know there is nothing wrong with my GPU, it posts just fine with CSM enabled. It just won't post with CSM disabled. I need to disable CSM, to enable secure boot (which is required for Win 11).

[Zando_]

5 minutes ago, walkthewalk said:

Please forgive me, but not exactly sure how this would help me. I don't want to use integrated graphics, I want to use my GPU. 

 

I know there is nothing wrong with my GPU, it posts just fine with CSM enabled. It just won't post with CSM disabled. I need to disable CSM, to enable secure boot (which is required for Win 11).

Your computer will not boot. Your dGPU is not necessary for a POST, it's a variable that adds unnecessary complication. Remove it. If the system will POST without it, then the issue was the GPU not liking the switch from CSM to non-CSM. If it still refuses to POST, then the GPU was not the failure point, something else is the issue. Either way, if you have an iGPU, removing the dGPU should be the first step.

 

It could also be Windows itself just not liking the switch from CSM to non-CSM. I haven't tried switching from one to the other, but you have to build a different installer USB for Secure Boot (non-CSM) or CSM systems, so I'd wager windows itself does not want to boot after that switch, and the motherboard sees it as failing at the GPU initialization stage. May need a fresh install.

[walkthewalk]

2 minutes ago, Zando Bob said:

Your computer will not boot. Your dGPU is not necessary for a POST, it's a variable that adds unnecessary complication. Remove it. If the system will POST without it, then the issue was the GPU not liking the switch from CSM to non-CSM. If it still refuses to POST, then the GPU was not the failure point, something else is the issue. Either way, if you have an iGPU, removing the dGPU should be the first step.

 

It could also be Windows itself just not liking the switch from CSM to non-CSM. I haven't tried switching from one to the other, but you have to build a different installer USB for Secure Boot (non-CSM) or CSM systems, so I'd wager windows itself does not want to boot after that switch, and the motherboard sees it as failing at the GPU initialization stage. May need a fresh install.

Thanks so much for the explanation! Will try this.

[Electronic0456]

I have the same problem. I disabled CSM and turned on secure boot and it made it so i cant get my screen to work even if i clean cmos. My motherboard is Gigabyte B365M aorus pro with a 9400F and RX 5700XT. The LED is red at VGA signal.

 

Edit: Its fixed now. I had to clear cmos and try to get my pc to turn on backup bios multiple times and it worked.