Since installing the Synaptics UltraNav driver version 15.2.14.0 from Lenovo ThinkVantage System Update, the synaptics features of the built-in trackpad are no longer controllable (it is acting in its default tap-to-click state, rather than respecting the preferences set in the UI). In addition, attempting to go to the mouse preferences in Windows brings up this dialogue:

Unable to connect to the Synaptics Pointing Device Driver.

If you have installed another PS/2 Pointing Device Driver please uninstall the Synaptics driver by clicking the Yes button. You then need to reinstall your pointing device for your external device again.

Do you want to uninstall the Synaptics driver now?

Which I have not done. I could perhaps attempt letting it uninstall then reinstall, but since the driver was preinstalled, then updated only through ThinkVantage System Update, where can I find the correct installer to run? Windows' Driver Rollback for the trackpad is greyed out a possibility*. I do have a current image backup but clearly this is a rather extreme measure.

As an aside, during this batch of updates I have noticed that the Wacom WinTab and Windows Ink interfaces for the pen digitizer have started working: http://forums.lenovo.com/t5/X-Series-Tablet-ThinkPad-Laptops/Pressure-Sensitivity/td-p/175507

There is some fringe possibility that this is related but I cannot really see why updating the Synaptics driver would break the Synaptics device; if anything I'd expect to lose WinTab capability.

* For some reason, it is available under Device Manager, but not the Hardware tab of Mouse properties. Go figure. Does anyone know if ThinkVantage System Update actually understands rollbacks and will re-offer the update, since by all experience it is an impressively clueless tool? (Oh look, that **bleep** uncserver window is back...)

Hello mate,

It's a known problem with the ultranav driver 15.2.14.0. It doesn't work properly. Waiting for a fix, you just have to install an older version.

There is one for 32-bit and one for 64-bit.

Right, thanks. I guess I'll let Windows rollback and hope that if/when a newer, fixed version is available the ThinkVantage tool doesn't tie itself in knots.

If you can roll back the driver it's the best way.