小弟也有遇到用主機板內建的HDMI口接螢幕，關閉螢幕電源約幾秒鐘後再打開，
沒有最大化的視窗會變成1024X768
國外有不少人遇到相似問題，
http://social.technet.microsoft.com...9b-8ac80a21fdc2

Possible solution 1:
In Power Options, under Advanced Settings for a plan, (where you can see all the devices, such as USB, HDD and so on).
Find the PCI Express device, and turn the energy savings off.

Possible solution 2:
Under device manager-->system devices-->ACPI Lid, open properties, go to Driver tab, select "Update Driver".
Choose "Browse my computer for driver software" and "Let me pick". Uncheck "Show compatible hardware".
For "Manufacturer" select "(Standard system devices)" and for model, select "Volume manager".
Apply the changes and restart.
After doing this, my monitor config went from "display only on TV" to "duplicate display on both monitors", so I had to switch it back to just display on the TV monitor, and then put the resolution back to what it was before.


按照上訴的去修改，因為ACPI Lid是NB才有的，桌機找不到所以拿ACPI Fixed Feature Button來試試看
驅動程式改成Volume Manager，中文是 磁碟管理員 ?!
硬著頭皮改，有一台H77晶片的主機就不會再遇到關閉螢幕電源再打開視窗會變成1024X768的問題，
但是H61晶片的主機改了似乎沒用，所以只好找一張顯示卡來避免此問題，
給大家參考。