I'm a long time Nvidia user, just replaced with a Sapphire HD Radeon 7850 the other night. Ever since, my monitor will not go to sleep after 15 minutes according to my Windows power settings. Looks like Windows stops generating a desktop image, the screen turns black; but the mouse pointer remains visible and the monitor backlight is still on. Definitely the Radeon here, as I said it worked perfectly with my old GTX 260. Any ideas?
Sapphire HD 7950, no overclocking
AMD Catalyst Driver Version, and Driver History
Catalyst 13.1. Upgraded from whatever the included CD installed (label says 12.8/12.10, so not sure which it used)
Windows 7 Ultimate 64-bit
Motherboard or System Make & Model
MB = Gigabyte GA-Z77X-D3H (user built system)
ThermalTake Smart 750W
Display Device(s) and Connection(s) Used
Gateway FHD2400, connected to Radeon via DVI cable. Has a built in USB hub, so monitor is also connected to PC via USB; and a Logitech webcam is plugged into the monitor's USB port. (The monitor's USB is also used for downloading camera photos and syncing iPods, but those are only connected when in use.)
Applications and Games
N/A. Issue is with Windows power settings.
CPU = Intel Core i5 3570K OC'ed to 4.4 GHz. Multi = 11x, vcore = 1.248
Motherboard BIOS Version
American Megatrends, version F15, 8/22/2012
System Memory Type & Amount
G.Skill Ripjaws X, 16 GB (4x4GB)
Boot drive = OCZ Vertex 4 SSD, 250GB. Also has a Western Digital Velociraptor (250GB) and a Western Digital Caviar (1.5 TB). A 1.5 TB Western Digital external drive is connected via USB for backup.
Two optical drives, an LG Blu-Ray burner and a Philps DVD-RW burner.
Two CPU fans (push-pull), 3 additional case fans.
Norton reports the system is clean.
Edit - I should add that this behavior is not consistent...sometimes the monitor does go to sleep! But most of the time it does not, I would estimate 4 times out of 5 it does not go to sleep. I have not been able to discern a pattern.