TIP:
[root@kindle root]#
lipc-set-prop -i com.lab126.powerd preventScreenSaver 1
or use Kaffiene.
Usbnetworking will need mode cycling if you let it drop to screensaver while WIFI connected.
On my system I simply enter
[root@kindle root]#
usbnetworking; usbnetworking
to fix this issue when I forget
(In MyTs 8 terminal on the kindle)
Good Luck.