[GUIDE] DSDT override eGPU error 12 fix  

This is indeed great news. I intend to setup Bcamp/W10 on my 2017 15"/560 MBP this week. Looks like this is gonna save me a ton of Aspirin! 8)

I have a 2017 15` Macbook Pro 3.1ghz and 70% of the time it just works on Windows Bootcamp without any trick. I'll look into this now "disable then re-enable the eGPU hosting TB PCIe bridges" when I boot it and get error 12 😀 

I can confirm "Large Memory" in a mid-2017 13" non-Touch Bar MacBook Pro. I'm running a DSDT dump right now.

I can confirm the factory Large Memory on my 2017 15` MBP Radeon Pro 555 3.1ghz

Hey guys, I've got a Thinkpad W520 and I'm here because of the famed error 12.

The W520 is running a 64 bit version of Windows 7, and using the ExpressCard slot (using a V8.0 EXP GDC) to connect my eGPU (which is a Gtx 1050 Ti). The card  is powered by an EVGA Silver Rated 430W power supply. The W520 has an Intel HD 3000 and a Quadro 1000M. The 1050 Ti has been detected, and drivers have been installed, but as I mentioned I'm suffering from error 12.

I'll give some (more) background data in a moment, but my basic question is will DIY eGPU Setup 1.35 work in my situation? With that out of the way, onto the background data!

Initially I tried just following the guide. Step 1 was pretty straightfoward, and I didn't really run into any hiccups. It took a couple compiles/edits before error "ATMC() – error: ATMC is not a method" went away, but eventually it did and I was able to compile dsdt-modified.asl (albeit with many, many warnings).

Then I compared the two file sizes as per the instructions:
dsdt-modified.aml was 54.7Kb
dsdt.dat was 56.1Kb
So clearly they're within 10% of each other, AND dsdt-motified.aml is smaller that the dsdt.dat file.

The first time I set all this up I went for option 1,  Load your dsdt-modified.aml as a registry override with Windows test signing mode enabled. This, although never throwing any errors in the command line, resulted in a BSOD when the Windows logo tried to load. So after a quick system restore, and going through all the steps again, I'm more inclined to use option 2.

After following the next few instructions I found out my HDD partition was style MBR. Upon that point it requires the premium software which I don't mind getting if I'm reasonably confident it'll work. So that brings us to my original question of "Will it?"

I know this stuff is pretty uncharted, so I definitely don't expect a hard yes, but a "Probably/most likely" would definitely boost my confidence.

Cheers.

@goatdust,  the steps needed for eGPU Setup 1.35  to load a supplied dsdt-modified.aml file are described here.  If need more details then please email me. I do support for eGPU Setup 1.35 via email. 

Just wanted to chime in and say thanks, this did the trick for my 2016 nTB MBP 13 + 1050 Ti in a Mantiz Venus.  All I needed to do was a Refind install (Technically would have been fine with USB boot but that's just clunky) with the apple_set_os.efi fix then DSDT fix after that now it's all working perfectly.

Hi all!

I started following the guide for resolving error 12 but I got some errors.

I am using a Windows 7 and I used the Microsoft method to modify the dsdt-modified.asl .

As a next step, once I tried to load it as a registry override with  Windows test signing mode enabled I got BSOD on bootup. So I had to use the second option. Since my hard drive is in MBR mode I already bought setup 1.35 and I plan to use it do overcome the error and disable the dGPU.

So here are my questions:

My Chrome started giving me an error BEX64 which is somehow related to the memory.  I am thinking about reinstalling the Windows anyway so I wanted to understand if the error will disappear and second if the modification I did with dsdt-modified.asl will still apply. I was hoping to use only the Setup without the need to do any other changes using root bridges and so. Are those one on OS level or they are kept even after reinstall?

Thanks for the help!

hworangs, your registry DSDT override will be removed upon doing a Windows reinstallation as the registry will be recreated.

Hey guys I am wondering if anyone can help me out here

I stuck am on Step 1 using Option 2: Use the Microsoft method  

• I added the required code needed for the DSDT override
• I am stuck on one last line of code that I do not understand
• ERROR: Expecting Symbol ‘{‘
• This error is literally the very last line of the .asl document 

As easy as that error sounds, I have not found a solution on resolving this issue and need some insight from anyone who has encountered this 

I have linked a screenshot of the error code, the original DSDT.asl file, and also the modified DSDT.asl file with the error code

Much appreciated if anybody can help me with this!

Was wondering if someone could help me with this DSDT Override procedure

I'm using a Sager NP5165/Clevo W150HRQ running windows 7

PE4C version 3.0, PCIe x16 interface for mPICe

I've followed all of these steps but when I get to the point of compiling there are 88 errors that I'm not sure how to fix

Am I missing something?

Any help would be greatly appreciated!

https://drive.google.com/file/d/0Bz_D31vr4RVpMzlpQTAtWnl3OGs/view?usp=sharing

Hello Guys, 
i would like to share another potential Code 12 fix (after successful DSDT override.).  After successfuly overriding the DSDT i was able to get my GTX 570 running for some time on my Elitebook 8460p. However couple of days later, i was getting the Code 12 Error again and couldn't manage to fix it, after doing the same steps, that i did the first time.

So the solution that i found (for me) was the following: Every time my eGpu don't get recognized, i reboot my Laptop, go into the Bios settings, wait for 5-10 seconds without doing anything and then just resume the boot up process. (Without restarting the system again! Just resuming the boot process) It looks like my system needs some time to allocate the graphics card. After doing that, my eGpu get recognized and i can use it normaly. 

I hope this could be helpful to some of you.

Cheers Radoslav

First of all, all my problems seem to have been disused here but with one problem… I know nothing about what I’m doing nor programing.

trying to get a GTX 1050 hooked up via a GDC beast v8 to a dell E5100 (I think, the tags are long gone) and have run into just about every error i think.

to get the gpu to even detect i find i need to cut my startup so it will interrupt itself next startup and ask if i want to boot normally or not, this delay i guess makes the card detectable.

the driver is using the 372 dirty install to newest.

current main problem[Error 12] i am having is with compiling the DSDT file, in several areas i am getting “return (Zero) : detected integer: buffer needed” and at the end of my compile error log in the cmd is a ton about this “_PLD” not existing or already existing in scope. i have seen the often llinked thread to the DSDT for macs however, I don’t have a mac, and i have no idea what yall are even talking about over there. so i am here to post basicly asking what _PLD even is or how to program i guess, sence im just kinda typing in junk and hoping it works/ what im currently doing is what one of the linked things to this issue said to make two different modified-dsdt files and use the second to fill in the first where the first has errors, but that doesn’t work on this issue.

oh right, the entire specs are :

windows 7 ultimate 64 bit,

6ddr3 ram

i5-250M

1 internal at 250GB

i see somehwere in this thread its kinda being discussed, ill look into it, maybe its missing a { somewhere.

hi, what does _T_0 stand for? i cant seem to place some other name in its place without "error: parseop_nameseg" to me it just looks like a variable for holding the various 0x# things

- im trying to change it because im getting an error saying _t_0 is inaccessible from a scope, yet they seem to be not needing to be in same scope so im assuming its just a placeholder when oving around stuff and not a function of somekind

UPDATE: i re-decompiled the dsdt-modified because i figured out i was doing somethings wrong, and it seems now that the compiler thinks that _T_0 doesnt even exsist.

 UPDATE 3: turns out the _PLD was the same as earlier in this thread! i needed package() { ... } as for the _T_0 in the update 2, the issue was the _T_0was created implicity (is that the right wordage) and not actualy declared so i made a name(_T_0, Zero) above the first method to try and use it. it compiles now and im glad to say i think i know how to read this slightly, thanks to all of yall's posts in this thread.

UPDATE 2: im sing these things in top dont have a refrence to another file, or something, could these be the issue with my _T_0?

 External (HDOS, MethodObj) // Warning: Unknown method, guessing 0 arguments
 External (HNOT, MethodObj) // Warning: Unknown method, guessing 1 arguments
 External (HWID, IntObj)
 External (IDAB, MethodObj) // Warning: Unknown method, guessing 0 arguments

Hello all!

I tried to get egpu setup working and hit the wall with the error 12.
I now think this guide would be answer for my problem, but so far I am stuck.

The reason is that i cant install wdk kit. It wont simply install. :C

I am thinking to try blindly to use previous compiled dsdt dump and just hope that it works. Or is this pure madness?

/Thinkpad x220, exp gdc, gtx 1060 is the setup I try to aim at.  WORKING NOW!

//Edit

Update:
I managed to get everything working. Building my own dsdt and using Diy egpu to force allocate the egpu to the 32bit space.

I had then errors, 43, 10 and 12 witch all was about Nvidia drivers. Managed to install modded 368.81 driver and updated it to 378.78 as shown here. This was latest driver that didn't cause error 43 for me.

I am happy with the 70% performance of my card witch i am getting now with this setup. (with ext. monitor)

One mystery remains thou: I couldn't get  the windows to keep my modded dsdt tables and only solution i now have is that i have to run pci compact and starup.bat from Diy egpu every time I boot. I will count this as success, but it would be neat to automate that also.

Thanks for these guides and for nando for amazing program. (game was handy in couple of frustrating moments!)

It was such a happy tinkering!

Cheers!

I´m getting a compile error that i can´t find in the reference sheet.

dsdt-modified.asl(1843): error: AR00 is not a method

anyone got a solution for this issue? 

Windows 10 (in test mode). followed the guide and tried the Microsoft way.

Ah yes notice large memory on my MacBook Pro 13” mid-2017

I still get this error after this command :-
"C:\dsdt>iasl -ve dsdt-modified.dsl

Intel ACPI Component Architecture
ASL+ Optimizing Compiler version 20161222-32
Copyright (c) 2000 - 2016 Intel Corporation

Compiler aborting due to parser-detected syntax error(s)
dsdt-modified.dsl 11669: Arg1
Error 6126 - ^ syntax error, unexpected PARSEOP_ARG1

ASL Input: dsdt-modified.dsl - 13001 lines, 433199 bytes, 5261 keywords

Compilation complete. 1 Errors, 0 Warnings, 0 Remarks, 0 Optimizations".
How to fix this? Please someone help me. Still can't create  dsdt-modified.aml file

Hey folks, so interestingly enough I managed to get my Sony VAIO  to play nice with a GTX 1050Ti using the older nvidia driver and then updating from a modified one to the newest.

But despite using eGPU setup my card seems to show up in device manager from time to time. Sometimes I boot and it is there, other times it disappears and does not seem to initialize at all. 

(edit)Hot swapping wifi card does not help 100% of the time, would like a more permanent way to keep the video card in device manager

So I decided to do the dsdt override but my dsdt file is too big according to EGPU software.

I cleaned up the OSI section. But how do I locate the esata,or COM LPT ports to delete these files and make the dsdt smaller. Is there another way? I do not have a mac to run this on.

edit2(large memory) the other link in my post failed.

@cr4zyw3ld3r, you can attempt a registry override. Once confirmed you have 'large memory' you can see if it helps your situation. Only then would it be worthwhile pairing back the DSDT & loading as a memory substitution to remove the pesky test signing mode.

 Large Memory Success

Thanks nando I did manage to get it going through the reg. But I would prefer an in memory substitution. Is it better to ask over at techinferno or tonymacx86?

@cr4zyw3ld3r, I've emailed you a suggestion on how to quickly sort out this DSDT shrinking dilemma.

Thank you so much for this tutorial. Most of it worked for me no problem. A few hiccups. I was running mbr and had to convert to gpt prior to the mount command to work. When copying the EFI folder over no ACPI directory existed. Manually creating the directories and placing the file in there worked just fine though. The items I'm using are the Lenovo W530 and the EXP GDC 8.4 expresscard eGPU adapter.

hi – I’ve been following the process outline in this stickie guide from @nando4

A problem occurs in the second part of Step 1 and appears to be a frustration of a number of people, as Ive read in a couple forums…

-Command- asl /u dsdt.dat

-Error- asl_ERR: UnAsmOpcode: invalid opcode class 0

The above does create a dsdt.asl file, but its completely empty… so, the subsequent line, which copies the data into a dsdt_modified.asl file is blank as well.

It would be great if we could get some guidance as to how we can fix this. Alternatively, if anyone has this pre-complied for a Lenovo T470s, Id greatly appreciate them offering the file

--------

Setup: Windows 7 Enterprise 64 bit OS on a Lenovo T470s with a hp Omen Accelerator housing a GTX 1080

After following the steps and changing the registry values I’m BSODing on startup? How do i fix this? Working off my iPhone now.

 Hi all, thank you for this fantastic forum; it's a great source of informations.

My setup consists of an exp gdc v8.5c (express card) and an HP 6530b with 3GB of ram. I'm stuck with error 12. I've already done DSDT override succesfully: Large memory is appearing in my device manager. However, my egpu (amd 5830) still gets error 12. I also tried to follow the steps described in the faq: re-plug and play the gpu, stop windows 7's boot and hot plug the express card, run che code "

bcdedit.exe -set PCIEXPRESS FORCEDISABLE" but none of these solutions worked.
I also tried to disable all the device in device manager and connect the express card but i'm still getting error 12.
I don't know any other solutions. Please, could anyone help me? Thanks in advance. 

EDIT: i even tried to run the notebook with 2GB o ram (1 dimm) but error 12 still persists

@marionato, error 12 solutions are presented in the mPCIe/EC/M.2 go-to installation/troubleshooting guide at:

https://egpu.io/forums/expresscard-mpcie-m-2-adapters/mpcieecngff-m2-resolving-detection-bootup-and-stability-problems/

Are there any updates to MBP 2016 firmware so that we can also have the DSDT override without windows test signing or clover?

Hey guys check this out! 

https://www.easeus.com/partition-master/convert-gpt-disk-to-mbr-disk.html

Would this tool allow me to convert my external hard drive to a MBR table scheme?

Then I would use bootcamp to install windows 10 on my external hard drive then use DIY-eEGPU setup 1.35 to enable an in memory DSDT override without the risk of bricking my macbook pro?

Thank you!

@nando4

I can confirm success with the GPT --> MBR conversion using:  https://www.partitionwizard.com/free-partition-manager.html  

Note that you don't need to reformat the drive!

Could this be the solution we have been looking for? 

Is there a way to resolve BSOD resulting from this process using the Intel Method?  I'm getting ACPI BIOS ERROR from the primary drive.  The PC won't boot beyond post and BSOD occurs when I try to boot normally/in any safe mode/etc.  The file structure is still intact, and I was able to boot from an external spare drive from an old laptop to confirm, but Startup Repair is ineffective from the recovery media I created and I lost all of my restore points I had saved externally on a backup drive.

When I checked the modified dsdt.dsl file, it came through with 0 errors, ~180 warnings, ~90 unknown methods, and 8 folded constants.  I thought that as long as it compiled with 0 errors it was fine?

@dejaun_blackford , doing a pre-boot DSDT override via Clover (UEFI) or Setup 1.35 (MBR) as is on the opening post has no BSODs. Just boot Windows without going via a bootloader as a fix.

Hey guys I've been struggling with this. After going over it again I thought i'd better enlist for some help from tonymacx86 but don't know if something you would know too trying to compile dsdt-modified.aml?

only get 2 errors
Compiler aborting due to parser-detected syntax error(s)
dsdt-modified.dsl 8432: SUBF
Error 6126 - ^ syntax error, unexpected PARSEOP_NAMESEG

dsdt-modified.dsl 8887:
Error 6126 - syntax error, unexpected PARSEOP_CLOSE_PAREN and premature End-Of-File

ASL Input: dsdt-modified.dsl - 8887 lines, 293802 bytes, 3104 keywords

Compilation complete. 2 Errors, 0 Warnings, 0 Remarks, 0 Optimizations

Or can diy setup 1.35 resolve all of these? I have a clevo p151hm1 i7-2630QM and 1x GFX 560m GTX. Only get error 12 (so far). Thanks!

Hi anyone can help, Im stuck with this error on step 1.

Microsoft Windows [Version 10.0.16299.125] (c) 2017 Microsoft Corporation. All rights reserved.

C:\WINDOWS\system32>c: & cd \dsdt

C:\dsdt>iasl -ve dsdt-modified.dsl

Intel ACPI Component Architecture
ASL+ Optimizing Compiler version 20161222-32
Copyright (c) 2000 - 2016 Intel Corporation

dsdt-modified.dsl 11299: (Local0 & 0x60)
Error 6114 - ^ Result is not used, operator has no effect

ASL Input: dsdt-modified.dsl - 11814 lines, 377206 bytes, 5001 keywords

Compilation complete. 1 Errors, 10 Warnings, 19 Remarks, 280 Optimizations

C:\dsdt>

Hello, i try to make dsdt for my graphic card, and when i use 

c: & cd \dsdt
acpidump -b -z
asl /u dsdt.dat - this
copy dsdt.asl dsdt-modified.asl

Then i get error C:\dsdt>asl /u dsdt.dat
Microsoft ACPI Source Language Assembler Version 5.0.0NT
Copyright (c) 1996,2014 Microsoft Corporation
Compliant with the ACPI 5.0 Specification

asl_ERR: UnAsmSuperName: invalid SuperName - 0x83
asl_ERR: UnAsmSuperName: invalid SuperName - 0x0a

Someone can help me?

HP Elitebook 2560p