4090/4080 eDP DP_D vBIOS MOD

[SuperMG]

5 hours ago, ssj92 said:

Just checked 2 5090 & 3 5080 vBIOS. 

 

2x 5080 = DP_B

1x 5080 = DP_A

 

1x 5090 = DP_A

1x 5090 = DP_B

 

So none have DP_D. I'd be surprised there's any 5090/5080 with DP_D eDP since 4090/4080 doesn't have any 

I asked them and I'm waiting for X-Vsion VBIOS and I'll use the software to parse the DCB data.

[ssj92]

7 hours ago, SuperMG said:

I asked them and I'm waiting for X-Vsion VBIOS and I'll use the software to parse the DCB data.

I forgot to ask, so since the DP is on A or B, do you see any bios screens on the 4090/4080? 

[SuperMG]

17 minutes ago, ssj92 said:

I forgot to ask, so since the DP is on A or B, do you see any bios screens on the 4090/4080? 

Yes A works but B doesn't (since eDP is on B and laptop's eDP is in D). Only DP_A, DP_C and DP_D are working.

 

Yes BIOS screen works on all the laptops I tested. I guess they don't care if it's DP or EDP in D

[ssj92]

1 hour ago, SuperMG said:

Yes A works but B doesn't (since eDP is on B and laptop's eDP is in D). Only DP_A, DP_C and DP_D are working.

 

Yes BIOS screen works on all the laptops I tested. I guess they don't care if it's DP or EDP in D

Have you tested this on AW systems? I don't have any non AW to test atm but having this knowledge will help

 

basiclaly, A, C, D will show bios screen but not work in windows with edid override 

[SuperMG]

15 minutes ago, ssj92 said:

Have you tested this on AW systems? I don't have any non AW to test atm but having this knowledge will help

 

basiclaly, A, C, D will show bios screen but not work in windows with edid override 

Yes I can go to BIOS with the RTX 3080 and RTX 4070 with the backlight mod v2 in dp_d

 

Because of DP_B, the drivers is packing and setting all displays to error 43 non-PnP 

[ssj92]

25 minutes ago, SuperMG said:

Yes I can go to BIOS with the RTX 3080 and RTX 4070 with the backlight mod v2 in dp_d

 

Because of DP_B, the drivers is packing and setting all displays to error 43 non-PnP 

What about 4080/4090 on AW? It also show bios screen with eDP cable then windows black screens? 

[SuperMG]

16 minutes ago, ssj92 said:

What about 4080/4090 on AW? It also show bios screen with eDP cable then windows black screens? 

Yup. Like on Clevo and Dell Precision too.

 

Windows only blackscreen when drivers are present

[ssj92]

26 minutes ago, SuperMG said:

Yup. Like on Clevo and Dell Precision too.

 

Windows only blackscreen when drivers are present

That's very interesting, so the laptops themselves don't even care about eDP on A, C, D. I will need to look into the vBIOS more now with this data.

 

If you can get their 5080/5090 vbios send to me so I can check it as well. 

 

This is all a windows issue with nvidia driver. 

[SuperMG]

4 hours ago, ssj92 said:

That's very interesting, so the laptops themselves don't even care about eDP on A, C, D. I will need to look into the vBIOS more now with this data.

 

If you can get their 5080/5090 vbios send to me so I can check it as well. 

 

This is all a windows issue with nvidia driver. 

Yep as I knew it's a Nvidia drivers issue 100%. Yes laptops only want DP/eDP data to display on the eDP DP_D display, that's it.

 

X-Vsion told me that some "motherboards" they tested, the drivers don't throw an error 43 and don't set the main display to non-PnP in DP_D mode. 

 

DP_B could display only if there are no drivers + LCD cable disconnected. Yes we need drivers to display more than 1 display thru DP and HDMI out.

 

The EDID override is handy because it removes the error 43 on the GPU's drivers and allows display in DP_A, C and D. Without EDID override, you can't use the GPU's drivers in windows.

[SuperMG]

4 hours ago, ssj92 said:

That's very interesting, so the laptops themselves don't even care about eDP on A, C, D. I will need to look into the vBIOS more now with this data.

 

If you can get their 5080/5090 vbios send to me so I can check it as well. 

 

This is all a windows issue with nvidia driver. 

Hello. Didn't you say someone in this forum could change the DCB route from the SBIOS? (Ivy and Haswell?)

 

If so...

We can even tell the SBIOS that the eDP is in B instead so we don't have to do EDID override for the 4080/4090. Which means the DP_B out will work too!

 

Again, Edid override works in all systems. Dell based systems too. Universally on Windows 10 and 11. Without it, we can no longer use the GPU's drivers and it'll display nothing on every ports.

Only issue is we lose the DP_B output because it's non-PnP.

[ssj92]

3 hours ago, SuperMG said:

Hello. Didn't you say someone in this forum could change the DCB route from the SBIOS? (Ivy and Haswell?)

 

If so...

We can even tell the SBIOS that the eDP is in B instead so we don't have to do EDID override for the 4080/4090. Which means the DP_B out will work too!

 

Again, Edid override works in all systems. Dell based systems too. Universally on Windows 10 and 11. Without it, we can no longer use the GPU's drivers and it'll display nothing on every ports.

Only issue is we lose the DP_B output because it's non-PnP.

Janepa said that on M18xR2 and it requires heavy bios modding and a new bios chip to support a larger bios. 

 

I haven't looked into that myself yet but it's something I can look in the future. It's much easier to make a small app for windows that fixes the edid issue if the bios and everything works fine (only windows issue) 

[SuperMG]

1 hour ago, ssj92 said:

Janepa said that on M18xR2 and it requires heavy bios modding and a new bios chip to support a larger bios. 

 

I haven't looked into that myself yet but it's something I can look in the future. It's much easier to make a small app for windows that fixes the edid issue if the bios and everything works fine (only windows issue) 

EDID is just a script that executes at each startups.

 

We just want to use back the DP_B, that's the annoying part, that's it literally it. The rest is usable.

 

Could try on the clevo p570wm. It has a big chip, 64MBit and there are some space left.

[ssj92]

47 minutes ago, SuperMG said:

EDID is just a script that executes at each startups.

 

We just want to use back the DP_B, that's the annoying part, that's it literally it. The rest is usable.

 

Could try on the clevo p570wm. It has a big chip, 64MBit and there are some space left.

His bios was over 12MB already and it uses a newer Intel ME. 

 

It's not "simple" to switch from DP_D to DP_B in the laptop, if it was it would be done already. 

 

Again everyone who only thinks in hardware takes software way too lightly. I'm a hardware person myself, but after these last few months working on bios modding, I see how tedious it is just to implement one thing. 

 

For me this is low priority for now. Once I have done my other mods I can take a look, but edid being a simple issue, it's not much of an issue to me. I'm going to make a simple windows program that autofixes and autodetects this in the future, but that's after I get my 4090 heatsink and swap the eDP panel for my 17 R1.