Display Resolution: Pavillion a6750y, ATI Radeon HD 3200, Westinghouse LCM-20v5, 1400x1050@60Hz [ Edited ]

[CMatthews]

Configuration
HP Pavillion a6750y (Desktop)
Video: ATI Radeon HD 3200 Graphics
Output: Westinghouse LCM-20v5 (attached via D-SUB, VGA)
Output Optimum Resolution: 1400x1050 @60Hz
Operating System: Windows Vista Home Premium x64

Symptom/Problem
Unable to consistently establish optimal display resolution (1400x1050 @60Hz).

Detail
My Westinghouse LCM-20v5 is attached via VGA. The optimal resolution on this display is 1400x1050. Westinghouse does not supply a driver or .inf file for this monitor. Windows Vista does not have a built in driver for this monitor.

I have attempted to use the following drivers:

Generic Non-PnP Monitor
Generic PnP Monitor
Digital Flat Panel (1400x1050 60Hz)
Custom .INF File Generated with "PowerStrip"

Trying each of these, Windows Display properties will only sporadically, and very rarely, allow me to select this reslution.

ATI Catalyst Control Center, when launched, regardless of Driver, under Displays Manager always shows Default VGA Monitor [ Single ] without the option for 1400x1050.

ATI Catalyst Control Center will allow me to select 1400x1050, but only if I click "Detect Displays" several times until it finally detects the display as: A201P1 [ Single ].  Sometimes I have to click it once, sometimes 8, sometimes 10 times, it's always different.  Once it detects it as A201P1 [ Single ], I can select the correct resolution.

 It works perfectly fine in this resolution until the next time I restart the computer, in which case I have to go through the entire process again.  Sometimes the "Detect Displays" won't work until I reinstall the driver/inf on top of itself.

This is a new machine, less than 6 days old.  Other than that, it seems to be fine.

EDIT: I will get a DVI cable from work tomorrow and try hooking it up via the DVI port on the back of the computer and trying the Digital Flat Panel driver again .. seeing as a VGA cable is analog, the Digital Flat Panel driver may not work completely.  (Although the custom INF should have).  Will check back in when I try the DVI cable.

Message Edited by CMatthews on 01-29-2009 09:13 PM

[erico]

You are using the PCs onboard graphics. The onboard graphics controller simply has problems with the non-standard display resolution you are asking it to display on your monitor. Even with a nice PCI-e x16 video card installed you will still have problems. The standard native resolutions for 19-22" monitors is 1280 x 1024  /1440 x 900 dpi / 1680 x 1050. If you have a monitor which has  the preceding native resolutions you will not have a problem with onboard graphics of virtually any PCI-e graphics card. Your Westinghouse LCM-20v5 is the source of your display resolution problems.

BTW use the DV-DI connector on the monitor and motherboard as it is digital. I searched and discovered many people have the same issue as youself when they are using theWestinghouse LCM-20v5. There are no drivers as it is a plug n play monitor.