I just built a system with an Intel DH87MC motherboard and i7-4770 processor. I have a Samsung S27B970D display (2560x1440 resolution) connected via DisplayPort and I'm running Windows 7 x64 (SP1). When windows hits the power setting timeout to "turn off the display", my display is blacked out, but does NOT enter low-power mode as it should. Also, if I actually turn off the display using the display's power button, I hear the Windows "Device Disconnect" sound and when I power the display back on I hear the Windows "Device Connect" sound, and any open apps/windows have been resized and moved to fit what appears to be a 1024x768 resolution desktop. (All windows are now in the top left corner of the display.)
I have the latest Intel Graphics driver (9.18.10.3165). I used the same display (also with DisplayPort connection) on my previous PC which was also running Windows 7 x64 (SP1) but with a Matrox adapter and had no problems with Windows being able to 'turn off' the display or screen resolution resetting when the display is powered off, so I think it has to be the Intel Graphics and/or driver.
Has anyone else seem anything similar? I've contacted support and they now want to replace the processor, but I have a hard time believing that that is going to resolve the problem. And I'm also not looking forward to being down for however long it takes to receive the replacement processor. The processor seems to be working OK (apart from this problem if it is indeed caused by the processor).
Does anybody have any other ideas?
Thanks,
Brian