[CentOS] Can't get resolution higher than 1280x1024 - Centos 5

[Bob Chiodini]

Alfred von Campe wrote:
> I have a similar problem as the OP.  I'm trying to configure a Dell 
> 2407WFPb LCD monitor at its native resolution of 1920x1200 on CentOS 
> 4.4 system.  But I could only get to 1600x1200 in 
> system-config-display.  If I manually edit the xorg.conf file to 
> include 1920x1200 and restart the X server, that resolution disappears 
> from the xorg.conf file.
>
> CentOS doesn't know about the 2407WFPb; the closest is the 2405FPW, so 
> I manually set it to use this.  Looking at the specs for these two 
> monitors, they seem to have the exact same horizontal and vertical 
> frequencies for 1920x1200 (74.0 kHz and 60.0 MHz), which are in the 
> range specified in xorg.conf.
>
> I've also tried to set the monitor to "Generic 1920x1200 LCD), but I 
> still don't get that mode as an option.  I am offered 1920x1440, but I 
> don't think the monitor can support that.  BTW, I am using the DVI 
> output of an NVIDIA GeForce 6200 card, and I am running the closed 
> source NVIDIA driver.
>
> Any thoughts on what I can try next to support the native 1920x1200 
> resolution?
>
> Thanks,
> Alfred
>
Alfred and Paul,

There seems to be some problem with the EDID info, that may have been 
pointed out earlier.  If you are using the NVIDIA (closed source) 
driver, try adding Option "IgnoreEDID" "true" in the Device Section of 
xorg.conf for the graphics card and add the monitor's specific sync 
frequencies in the Monitor Section.  For the SyncMaster 204t they are:

HorizSync  30 - 81
VertRefresh 56 - 75

Bob...