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In the "Starting the driver(s)" section in the user manual, the example says Detected EATON - Ellipse MAX 1100 [...].

Not all drivers do this. For instance, usbhid-ups uses upsdebugx(1, ...) which won't print to the console unless a user has debugging turned on.

After fixing the drivers, update the documentation in case the format has changed.

At least currently usbhid-ups does report the following details:

# ./drivers/usbhid-ups -a eco650
Network UPS Tools - Generic HID driver 0.49 (2.8.0-Windows-316-g0a5cfdfe6)
USB communication driver (libusb 1.0) 0.43
Using subdriver: MGE HID 1.46

But indeed gotta check that everybody does.

Also, following the example in description, it did not print the specific device information

I think it's a bug for programs to print version if not asked to (via some -v -or -D). Most daemons do not do this.

See also PR #2386 which should ensure that specifically NUT version is printed early.

For drivers/main.c it also revisits the upsdrv_banner() for common "NUT version + driver name" printout (flush stdout to make sure it is posted - notably might remain buffered and lost if the program segfaults etc).

With the PRs listed above, driver banner is always printed unless disabled explicitly, early before parsing the bulk of command-line arguments (or in help/verbose handling, if it was disabled). Stated scope goals seem achieved.