troubleshooting Question

Dell Inspiron 2310 W10 does not support Screen duplicate

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CNC-Guy asked on
Windows OSPCDell* Screen Display
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I have just updated an old Dell Inspiron 2310 all in one touchscreen PC to Windows 10 Pro (it was W7 Pro)
This was an upgrade - not a fresh install.

PC has an ATI Mobility Radeon HD 5470 on board.
It's also using a USB 2 VGA DisplayLink adapter (no name brand) to duplicate the display to a Viewsonic HD projector.
That way the user can use the touchscreen and display the results on the projector (important as Extend screen requires the mouse).
This worked perfectly in Windows 7 (the screen resolution had to be dropped to 1680 x 1050 to accommodate the screen duplication but I suspect this is because they had the Bios VGA memory size set to 512Mb).

I've updated the Bios to A04 and checked that the on board graphics memory is set to max (driver properties now says 1Gb dedicated and 3Gb shared display RAM).
All Windows updates installed.
I've installed the latest DisplayLink VGA driver (Feb 2020)
I've tried every driver I can find for the ATI card (including the Catalyst Beta 15.6 driver, and ATI Autodetect) but the duplicate display function does not work.
It turns off the signal to the projector (and does the same on a HD VGA screen I put in it's place).
I've also tried with the Bios VGA memory set to 512Mb as before.

I can extend the screen (but you lose the touch facility) without a problem.

After much research most people say this issue is caused because the driver is too old to support the W10 DisplayLink duplicate function.
And I cannot find another driver that is newer that supports that old ATI card.

If I disable the ATI driver and install the Microsoft Basic VGA driver instead - I can duplicate the screen but the drivers max res is 1280x1024

So my question is - does anyone know of a newer (possibly generic) driver that would support higher resolutions for the ATI card and support screen duplicate.
Or indeed a newer ATI driver that supports that graphics chip.

I cannot go back to W7 as I've updated an entire classroom of these (19 in total) and this is the only issue we have now.
A fresh install is not really feasible as the user no longer has the installers for some of the older software and I cannot get them from defunct manufacturer.

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