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Raspberry Pi fails to Wake Up

Symptom

The screen shuts off after a period of inactivity, and will not come back on. Everything else, such as keyboard and ssh appear to work normally.

Resolution

The solution is to disable power management:

Create a new file:

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

Add the following text to it, then Exit, Save and Reboot:

# Disable power management

options 8192cu rtw_power_mgnt=0

 With this patch in place, the screen will still shut off after a while, but now, a keypress will bring it back to life.