Some login tweaks for L4T 19.3 to disable USB autosuspend and lock the GPU to max MHz. I have lines 3-11 of tk1_tweaks.sh appended to my .profile.

tk1_gpu_max_clock.sh

#!/bin/bash
#
# Lock GPU and MEM clocks to max MHz
#
# - benchmarking shows there is no need to override the MEM clock
#
echo
echo Locking GPU clock to max MHz for debugging porpoises...

# set to max
cat /sys/kernel/debug/clock/override.gbus/max > /sys/kernel/debug/clock/override.gbus/rate
# cat /sys/kernel/debug/clock/override.emc/max  > /sys/kernel/debug/clock/override.emc/rate

# enable override
echo 1 > /sys/kernel/debug/clock/override.gbus/state
# echo 1 > /sys/kernel/debug/clock/override.emc/state

echo
echo "                                    __               "
echo "                                _.-~  )  GPU:" $[ $(</sys/kernel/debug/clock/gbus/rate) / 1000000] MHz
echo "                     _..--~~~~,'   ,-/     _         "
echo "                  .-'. . . .'   ,-','    ,' )        "
echo "                ,'. . . _   ,--~,-'__..-'  ,'        "
echo "              ,'. . .  (@)' ---~~~~      ,'          "
echo "             /. . . . '~~             ,-'            "
echo "            /. . . . .             ,-'               "
echo "           ; . . . .  - .        ,'                  "
echo "          : . . . .       _     /                    "
echo "         . . . . .          \`-.:                    "
echo "        . . . ./  - .          )                     "
echo "       .  . . |  _____..---.._/ _____                "
echo " ~---~~~~----~~~~             ~~                     "
echo

tk1_tweaks.sh

#!/bin/bash

#
# Halt USB autosuspend
#
sudo bash -c 'echo -1 > /sys/module/usbcore/parameters/autosuspend'

#
# Lock K1 GPU to max MHz
#
sudo ./tk1_gpu_max_clock.sh

dolphantastic ^^

I only logged into say that you saved my headless TK1 :D