iMac 2011 strange brightness issue

[1990diego]

Hi all,

Ive been having some brightness issues for a while on an old iMac. My maximum brightness depends whether if I boot from the USB or if I boot from the SSD. Also, I do have brightness control on max and validated this issue on a 2nd machine of mine with same hardware.

If I decide to boot from the USB the max brightness is higher than if I do it from the SSD.

This are the 2 iMacs I have, on the left one its booting from the USB and the right one from the SSD, both on max brightness. Validated this within the same machine to discharge its not a display thing.

Im pretty new to this world, but believe me I tryed to find an answer before running to post this here.

Hope someones gone through this and can help me.

some specs:
iMac A1312 2011, 27'' running Ventura though OCLP.
Upgraded GPU to a k3100M by nikey22 4GB

Hope some of you have gone through this and can help me. Sorry for my english and thanks for taking time reading this!

Also, if there is no walkaround, I wouldnt mind to leave a usb plugged onm it, buy any way I can remove the oclp message on startup?

THANKS!

 

[DeltaMac]

Have you tried reloading the patches for the current OCLP 2.4.0 while booted to the USB system, then reload the same OCLP patches while booted to your internal SSD?
(Reload the EFI patches for each boot drive while you are doing OCLP reloads. Redoing both will assure that both boot systems have the same setup. You can also hold the Option key when you restart, and make sure that you choose whichever EFI partition is set up for the boot partition that you will be using.
One result of that would remove the OpenCore Legacy Patcher message that you asked about.