Will legacy scanner driver still work in 26H2?

PaulGo said:

After much trial with Gemini I could get my Canon 4400F driver to work with Core Isolation temporally. However, it does not last after prolong sleep Windows will deactivate it and I have to go through the same procedure of deactivating Core isolation and then reinstalling the drive awhile leaving the scanner unplugged for a few minutes. This is from Gemini:

Yes, that is accurate. The root problem is the physical USB hardware controller inside the CanoScan 4400F and how it interacts with modern motherboard sleep states (ACPI).
Here is what happens during a prolonged sleep period:

1. Power Cut: Windows 11 puts the motherboard into a low-power sleep state and cuts off active power/data polling to the USB port.
2. Controller Freeze: The 2006-era USB controller inside the scanner loses communication. When the computer wakes up, the scanner's legacy hardware fails to send the required "wake" signal back to the USB bus.
3. Kernel Deactivation: Because the Windows 11 kernel receives no response from the scanner during the wake cycle, it assumes the hardware was unplugged or has failed, and deactivates the USB port binding.

Windows does not "delete" or "deactivate" the driver files themselves—it simply closes the dead USB connection. This is why software changes cannot fix the sleep disconnect, and why a physical USB disconnect/re-plug or a forced command-line refresh is required to make the motherboard recognize the scanner again.

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Easy fix for that: Buy a USB hub with on/off switches for each individual port and plug your scanner in one of these ports. When the computer sleeps you can switch off the scanner port, wait a few seconds, then switch it back on. Alternatively you can switch off the scanner (or remove the power cable), wait for a few seconds, and then switch it back on. Even better, configure your PC so it never sleeps.

PaulGo said:

I installed the Canon driver about 45 months in a new computer running Windows 11 Pro ago and the scanner was working without any problems until several months ago when I disconnected it. When I reconnected it last week Windows forgot that it previously worked and treated it as an unsupported device.

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Since the Canon driver is already installed, open Device Manager, find the "unsupported device" and right-click on it and select Update drivers. Select the second option (manually). Then the second option again (don't search). It will give you a list of suitable drivers. If more than one, it is usually the first in the list. Click on it and proceed to reinstall it. The scanner should work again. If you don't see the scanner in the list, uncheck the box to show compatible drivers only and click on Canon, then scroll to find your model and select it. There will be a warning that the driver might not be compatible, ignore it and proceed.

PS: There is a chance that the specific USB port is faulty and fails to detect the scanner properly. Try another USB port. Also you can buy a powered USB hub and plug the scanner there. Sometimes the power supplied from the USB port alone is not enough to properly detect specific devices. That's why rear USB ports work better, no cable extension like the front ports, so less signal attenuation. The extra power of the powered USB hub helps proper detection.