This posting is older than 6 months and can contain outdated information.
I'm having the same issue here on my MacMini 2011 running XBMC Eden Beta 3 and Candelair (to fix the volume up/down issues with the apple remote in XBMC which work fine now).
Energy settings in XBMC send the MacMini to sleep after 5 minutes. When I press a button on the apple remote (white model) it wakes up again (led stops blinking slowly and is ON all the time) but the monitor stays black. Only when I press a key on the keyboard the monitor wakes up (or more precise the graphics card wakes up). I can see that the MacMini got all the remote commands from where I am in the XBMC menu, just the monitor didn't wake up.
Before using Candelair the wake up was always working correctly, waking up the MacMini and the Monitor.
Edit: The MacMini is connected via HDMI to a Pioneer Plasma.
I added darkwake=0 as a boot string. It is =1 as default in Lion, and causing the display not to not wakeup using the remote.
Here is what I did in terminal:
sudo nano /Library/Preferences/SystemConfiguration/com.apple.Boot.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
Last edited: 12.02.2012 11:31:13
Last edited: 12.02.2012 13:16:19
Last edited: 12.02.2012 13:43:38