Solution to APC_INDEX_MISMATCH blue screen and win32kfull.sys error

Last week the brand new safety patches arrived in Windows 10. These new patches, at first, appeared easy, with only a few fixes and none of them important or zero-day. However, as quickly because the patch KB5000802 to customers of the 2020 variations of Windows the issues began to seem. Users world wide started to experiment blue screens on the system when making an attempt to print from their printers, it didn’t matter the mannequin or the model. Although initially Microsoft didn’t acknowledge the issue, ultimately the corporate ended up admitting it, investigating it and, lastly, providing an answer.

After putting in the KB5000802 replace, many Windows 10 customers have began to expertise blue screens when making an attempt to print. These blue screens are of the sort «APC_INDEX_MISMATCH»And is normally launched by the system file win32kfull.sys. After investigating the causes of the error, Microsoft has indicated that it’s attributable to sort Three drivers and doesn’t seem to have an effect on printers that use sort Four drivers.

Differences Between Type 3 and Type 4 Printer Drivers

We have most likely by no means heard of most of these drivers, and with good motive, since the place they stand out is, above all, in advanced enterprise networks managed by a Windows Server.

The Type Four drivers they’re essentially the most trendy. These drivers are usually those that ship with Windows and attain customers by Windows Update when appropriate {hardware} is linked. A brand new printer will nearly definitely use most of these drivers. It doesn’t require particular permissions to give you the option to set up itself on the PC.

On the opposite hand, Type Three controllers They are all these drivers that aren’t included within the Microsoft repositories, however have to be downloaded and put in manually from the producer’s web site. This is quite common on older printers, and forces directors to set up them, as a typical consumer wouldn’t give you the option to achieve this.

The APC_INDEX_MISMATCH error when printing impacts the way in which Windows takes management of the Type Three printer driver. Therefore, it doesn’t have an effect on a particular model or mannequin. If the printer has a Type Four driver, then we can have no downside printing.

Solution to APC_INDEX_MISMATCH blue screen when printing

Microsoft is already working to repair this downside on its working system. However, it’s most probably that we’ll not see the answer till the following safety patches, which is able to arrive on April 13, 2021. Therefore, whereas the answer reaches all customers, we are able to select two choices.

The first one, the obvious and quickest, is to uninstall the KB5000802 patch from our PC. We will endanger our laptop (though the vulnerabilities usually are not very harmful), so we should take excessive precautions.

Uninstall KB5000802

And the second of them, is by following the directions that Microsoft gives us within the next video. The instructions to execute, changing KX with the identify of the printer driver, are:

rundll32 printui.dll,PrintUIEntry /Xg /n “KX” rundll32


printui.dll,PrintUIEntry /Xs /n "KX" attributes +direct

After executing them, we are able to proceed utilizing printers with sort Three drivers. At least till Microsoft releases its new patch correcting these issues.