Win 7 to Win 10: apc_index_mismatch (portcls.sys) BSOD

I am getting huge amounts of error messages when updating from Win 7 Home to Win 10 Home (standard upgrade), clean install of Win 10 Home, reformatting the HDD completely, etc. I literally tried at least 10 times with varying degrees of success.

The computer seems to work fine in Safe Mode (with Networking). One time, it worked fine to the normal desktop and I even got sound for the first time, but when I install Windows Updates and restart, when it is configuring them, it automatically restarts and then I get the " " message and sometimes it just has

apc_index_mismatch
OR
apc_index_mismatch (portcls.sys)

The error messages lately have been appearing on system boot, and if the system manages to start into the normal desktop, it'll BSOD after 15-20min even on idle.

My laptop is a Pentium Dual Core T4300 (2.1GHz), 4GB DDR2 RAM, 250GB HDD, Mobile Intel GMA 4500MHD graphics, and Realtek HD Audio. I've been having a hard time getting audio to work, but the last time it was audible was when I rebooted the system and it crashes on system boot everytime now.

What log files should I upload here? It's getting quite frustrating. I'm not sure if it's just being an older laptop (from about early 2010) and the drivers for Windows 10 not being fully compatible. When it gets to the desktop, it's just as fast as my Surface Pro 3 in many ways.

Thanks for the ramble and I hope I find a solution!

 

https://social.technet.microsoft.co...smatch-portclssys?forum=WinPreview2014General

 

I can't even boot into Windows or Safe Mode anymore to retrieve the dump files. Currently reformatting and installing a clean Windows 10 installation once again!

Edit: Able to get to desktop again. If I attempt Windows Updates for audio, defender, acpi, etc. it crashes.

 

Finally got the dumps and am putting them into a zip file to Google Drive.

 

Dumps: https://drive.google.com/file/d/0B4JjhJ3e5vMdZWhzVl9NQkxYNEE/view?usp=sharing

 

System Info: https://drive.google.com/file/d/0B4JjhJ3e5vMdcVN1cUxZajU1X1U/view?usp=sharing

 

anyone know?

 

I can not seem to do anything with the dump file, can not download it etc.

Edit; Sorry I do not use this cloud junk.

 

Second icon on very top, next to Open with

 

I have a quad core for a reason, I am not converting or unzipping in the cloud, sorry.

 

So how would I upload it then? and what does having a quad core have to do with anything?

 

I work on zips etc. locally, this way I can be assured my system is safe. Yes I know old school but is the way I do things. I would suspect you need a classic type of file sharing service, myself I pay for a file server..

 

Okay....well, thanks. I'll figure it out myself..

 

Others here may be able to help, just again sorry I can't. Also W10 leaves very few if any clues as to why it crash's I wish,as doo others, it would be more forthcoming.

 

I think I narrowed it down to the audio drivers (Realtek HD Audio) causing the problem under Windows 10. I tried downloading updated ones dated June or July of 2015 and they keep failing. Otherwise the system works, except no sound.

For now I have disabled Windows Updates as it will keep trying to update that audio driver, unless anyone knows a way to disable specific windows updates from showing up on the download list?

Edit: I'll try this and see if it helps https://support.microsoft.com/en-us/kb/3073930

 

I did go back to Windows 7, and after not having audio again, I downloaded a random Realtek HD Audio driver from around the date my laptop was manufactured and Windows 7 came out (2010) and I have audio. Couldn't go to my laptop manufacturer's website because the company went out of business in 2013 (Averatec). For my laptop being 5.5 years old and of a not hugely known company, I haven't run into any problems with the hardware.

Haven't bothered to update back to Windows 10 to see if having that corrects the audio issue and other apc_issue_mismatch errors. But it's running fine on 7.

 

Audio drivers often need specific hardware ID code exactly like display drivers. You cannot always just install them because the installation will fail if the hardware ID of your machine does not match what it has in the INF file.

It probably doesn't help to tell you that you're not missing anything whatsoever by sticking with Windows 7 or 8. Curiosity is always really compelling and hard to resist, but Windows 10 is a really crappy OS. I'm not saying that because it killed 3 of my LCD panels, I'm just saying that because it's crappy. My Clevo is dual boot and Windows 10 runs flawlessly on it, but I'm typing this from the Windows 7 desktop.

Anyhow, at this point it's like a score that needs to be settled between you and the machine and you've got to teach it that you're still the boss. Extract the driver installation package to a folder and find the INF file(s) and see if you can find any lines with the hardware ID of your audio chip in Device Manager. If you find code with the same device number but different system ID, you can change the system ID part of the code to match your system and that will often allow the driver to work fantastic, like it was made for the machine even when it wasn't.

 

The realtek hd drivers I downloaded were from a lenovo laptop, from a Google search. It works fine under Windows 7 and even has the audio manager with equalizer settings like it did with the drivers made for this laptop brand.

Were you (or anyone else) able to diagnose my Windows 10 problem with the dump files?

 

It appears a few other folks are reporting similar issues with RealTek audio drivers with Windows 10. I'm looking at your dump files now. What model system do you have, and what model RealTek audio chip does it have?

 

The Realtek HD Audio drivers (under Windows 10) were trying to install via Windows Update the July 2015 2.72r or whatever the latest version on their website was. I figured it was causing some conflict because the hardware in this laptop may not be compatible with the newer drivers.

Averatec n3443 is the specific model, but the general model number is n3400 series. I don't have the laptop with me at the moment.

 

I just saw your post (Averatec). Still poking around with the dumps.

Question: Have you already attempted to installed the generic Windows Audio driver rather than a proprietary RealTek driver. I find this often works really well for legacy audio chips.

 

Yeah, I uninstalled the device (in device manager), it installed the High Def Audio, but no sound. When I clicked on playback settings on the taskbar, there would be no audio devices installed message.

 

Not sure if I mentioned it already, but running windows update automatically gave me the apc_index_mismatch message (sometimes it says portcls.sys, and sometimes it omits that ending).

The only thing I didn't try since I reverted back to Windows 7, was trying the 2010 dated realtek drivers I just found that gave me sound again under 7, with Windows 10.

 

This look like yours? http://www.techspot.com/review/204-averatec-n3400-ultraportable-notebook/

 

Yep~!

 

It looks like this person got it working with a Realtek "6305" driver (whatever that is). http://answers.microsoft.com/en-us/...d/4a01eba1-1184-4207-93ea-bca435433e46?auth=1

Did you boot Windows 10 with Driver Signature Enforcement (DSE) disabled so you could manually install an unsigned driver? That might help if you have not tried it.

In Windows 10, open an Admin command prompt and enter bcdedit /set {default} bootmenupolicy legacy and that will let you press F8 to get the Windows Boot Menu to disable DSE the easy way like Windows Vista and 7. (Same process works for Windows 8.)

The dump files are not very helpful. They all contain basically the same information and Googling the error leads to people seeking solutions. Supposedly the audio chip is Windows 10 compatible, but Windows 10 is probably trying to install the wrong driver. A Windows 7 or 8 driver will likely work OK if you install it while DSE is disabled. Once it is installed with DSE disable, Windows 10 will "accept" the driver.

Edit: did you already find and try this? It looks like disabling DSE is what worked for this person also.

Code:

Published on Mar 21, 2015
SOLVE WINDOWS 10 AUDIO DRIVERS PROBLEM - INSTALL REALTEK AC97 AUDIO DRIVERS

Error : Red cross mark on volume icon on taskbar even after installing drivers. Exclamation mark on audio device in Device Manager.

REALTEK AC97 DRIVERS
=====================
Download Link 1 : http://bit.ly/1IVAHIB
Download Link 2 : http://bit.ly/1fQVbUh
(Leave a comment, if the link is broken)

OK, the "6305" driver is part of the version number (6.0.1.6305). There is an x86 and x64 version available from the Microsoft Catalog. You can only access that with IE.
Here is a link: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=realtek ac97 6.0.1.6305

If you download the 32-bit or 64-bit (whichever version of Windows you are installing) and boot with DSE disabled prior to attempting to install, that may resolve your issue.

 

So just tried the update now, after upgrading the HDD to a SSD. Everything seems to be working, even with the latest updates of Windows 10 being downloaded/installed to the system. No error messages, nothing! I guess it took a while for drivers to be readily available for the more legacy computers out there!