GT710 Mojave black screen but ok on HS

[pct]

Hi
I am updating my old hack (from Mavericks) to HighSierra 10.13.6 (17G65) and Mojave 10.14.6 (18G95) with an MSI GT710 1Gb and this works fine with HS but I got a black screen with Mojave.

My MB is a Gigabyte H67MA-UD2H-B3 with a i3-2105 (Sandy Bridge) with HD3000 and a single hard disk with HS and Mojave installed in 2 partitions, booting Clover 4920, SMBIOS 14.1, display is a Dell P2217H with DisplayPort and HDMI.

I first installed HD and Mojave using the HD3000 and both are running well using the MB Display Port cable (I used patched HD3000 driver from HS for Mojave) .

Then I disable the IGP in the bios, installed the MSI GT710 and moved to HDMI cable (no DP on the MSI) :
* HS recognized the card and boot properly. It recognize the card as Model GK208B, Device ID 0x128B10DE
* Mojave starts and run (as the disk light flash some time) but no display : black screen to grey then no signal then black

The only change was to remove Inject Intel from config.plist

So what's wrong ? I though GT710 was OOB in HS and Mojave ? I do not know if Mojave load the right driver and/or if it fails to use the right port.

I found some posts saying there might have some problems with GT710/Mojave and made some tests : I tried to put lilu 1.3.8 and whatevergreen 1.3.3 in EFI/clover/kext/others, I tried to change system from 14.1 to 14.2 and 18.1 but not change

Any idea ?
How can I check what Mojave is loading as graphics driver and therefore find where is the problem ?
Why HS works really OOB and not Mojave ?

I have attached the config.plist I used for HS and the one for Mojave, main difference is the Model to 18.1 for Mojave, and the clover boot.log with a first boot with Mojave then HS.

Thanks

 

[pct]

up

No one to can give me some ideas on what could cause this black screen ?

Thanks