I have an Acer Aspire laptop running Windows 7 Home Premium x64.
I regularly connect it to my TV monitor via HDMI cable and fall asleep watching movies (played on VLC or Windows Media Player).
I set the computer to go to sleep after 1 hour.
Multimedia Settings are set to "Allow computer to sleep" under "When Sharing Media" in the Power Management section.
Screensaver is disabled.
I have overrided my audio driver, since powercfg command suggested it may be a conflict.
If I am playing a movie without the HDMI cable plugged in, the computer goes into sleep mode right on schedule. It is only when I have the HDMI cable plugged into my TV monitor, that it refuses to enter sleep mode.
What could be causing this problem? Makes no sense to me.