I recently built up a new machine for my fiancee and am having some issues with the monitor/video card setup. (system details below problem description)
I have no experience with HD video on PCs, so forgive me if this is a noob question (I wouldn't be surprised!)
Her new monitor is a 24" wide screen and supposed to support 1080p (1920 x 1080) as the default resolution. When I set the resolution to 1080p, the res changes without any problem, but not all of the screen real estate is used. In fact, there is about an inch of unused (black) screen on either side and a bit less on the top and bottom.
Setting the res to 1680 x 1050 results in the full screen real estate being used, but is obviously not the max res her screen / card can support.
I am also having issues with windows leaving a temporary trail when being dragged over other open windows, which in my experience generally indicates some type of directX or video driver issue, so the problem may be there (any tips on that are also appreciated!) I can provide a screenshot if it would help.
System details (relevant bits taken from dxdiag, let me know if you need more info):
Operating System: Windows 7 Professional 64-bit (6.1, Build 7600)
Processor: AMD Phenom(tm) II X4 945 Processor (4 CPUs), ~3.0GHz
Memory: 4096MB RAM
DirectX Version: DirectX 11
User DPI Setting: 120 DPI (125 percent)
System DPI Setting: 96 DPI (100 percent)
Card name: ATI Radeon HD 5800 Series
Manufacturer: ATI Technologies Inc.
Chip type: ATI display adapter (0x6899)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_6899&SUBSYS_29721682&REV_00
Display Memory: 2806 MB
Dedicated Memory: 1014 MB
Shared Memory: 1791 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)
Monitor Name: LG W2453(HDMI)
Monitor Model: W2453
Monitor Id: GSM56F5
Native Mode: 1920 x 1080(p) (59.934Hz)
Output Type: HDMI
Driver Name: aticfx64.dll,aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,aticfx32,atiumd64.dll,atidxx64.dll,atidxx64.dll,atiumdag,atidxx32,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll
Driver File Version: 8.17.0010.1041 (English)
Driver Version: 8.762.0.0
DDI Version: 10.1
Driver Model: WDDM 1.1
The issue I think you will find is that you have to set the configuration in your Catalyst Drivers Software. You may also find that in your HZ setting Catalyst may have the HZ rating set to low. Investigate that carefully. When you try and change the res in Windows it is being influenced by your Catalyst settings.
Yes Wa1 is right, update your video card drivers first then restart observe if that solved the problem. Even if your monitor support this 1920 x 1080 but your video card has a problem you will not end up satisfied. Try to install another video card just to check this.