build rtl8192 usb wireless drivers for nvidia jetson tk1 lt4-21-1 and permanently disable the power management

download the kernel sources from developer.download.nvidia.com

decompressed the files into /usr/src, the directory should like this /usr/src/kernel.

#zcat /proc/config.gz > /usr/src/kernel/.config

$cd /usr/src/kernel

#make prepare

#make modules_prepare

$cd /the/path/to/the/usb/driver/

$make ARCH=arm

#make install

block the default rtl8192cu driver
vi /etc/modprobe.d/blacklist-native-rtl8192.conf This file ships with the rtl8192-fixes DKMS module. Blacklist the native (and currently broken) kernel driver so ours gets loaded instead: blacklist rtl8192cu blacklist rtl8192c_common blacklist rtlwifi vi /etc/modprobe.d/8192cu.conf prevent power down of wireless when idle options 8192cu rtw_power_mgnt=0

reboot the device you can check the status if it is off: cat /sys/module/8192cu/parameters/rtw_power_mgnt it should be 0 now.