Auto-negotiation - Out of business

[poma <pomidorabelisima gmail com>]

Salute Giudici,

https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=12b9d30
NOTE: changed the default value for auto-negotiate from TRUE to FALSE.

It not only leads to maximum network interface deceleration
    Advertised link modes:  Not reported
    Advertised auto-negotiation: No
    Speed: 10Mb/s
    Auto-negotiation: off
but in some cases, because of an over zealous power management,
the device is disconnected - connection remains down.

So this is the question;
How to configure ethernet 'auto-negotiate' -globally- within the NetworkManager.conf,
to return to modus operandi prior to this change,
without changing the source code:
$ sed -i 's/  FALSE/  TRUE/' libnm-core/nm-setting-wired.c
?