Preventing Raspberry Pi WiFi from going into Sleep Mode

I keep logged into my Raspberry Pi from my Mac. The Pi is connected to my network using a USB WiFi adapter. But when I leave the login idle for a while, I find it to be (a) frozen and (b) I cannot login via a new ssh session – in fact, I can’t even ping the Pi anymore.

I found the solution for problem (b) above in a StackOverflow post.

This is what you need to do:

sudo nano /etc/modprobe.d/8192cu.conf

Add the following:

# Disable power management
options 8192cu rtw_power_mgnt=0

Thanks to user Herohtar at SO – I tried this, and it seems to work very well. I still need to figure out problem (a) – prevent a login session from freezing on long periods of inactivity.