Since display drivers are not "normal" wdm drivers, I
would like to know if they support windows management
instrumentation (WMI)?

Also, is wmi bidirectionnal? As I understand, wmi is used
to send driver information to user mode application, but
can the opposite by done? That is user mode application
sending information to driver?

Thanks in advance.

Surely! Only WMI events are for driver->app flow, the rest of WMI is for
app->driver flow.

Max