I need help getting mt LCD monitor to operate at 60Hz

[Andy Ritger]

If you're using the NVIDIA driver, then you can enable verbose
logging (e.g., `startx -- -logverbose 5`); the X log will then
contain all the modes in the modepool for the display device in
question; e.g.:

(II) NVIDIA(0): "1280x1024"            : 1280 x 1024 @  60.0 Hz  (from: X Server, VESA)
(II) NVIDIA(0): "1280x1024_60"         : 1280 x 1024 @  60.0 Hz  (from: X Server, VESA)
(II) NVIDIA(0): "1280x960"             : 1280 x  960 @  60.0 Hz  (from: X Server, VESA)
(II) NVIDIA(0): "1280x960_60"          : 1280 x  960 @  60.0 Hz  (from: X Server, VESA)
(II) NVIDIA(0): "1024x768"             : 1024 x  768 @  60.0 Hz  (from: X Server, VESA)
(II) NVIDIA(0): "1024x768d60"          : 1024 x  768 @  60.0 Hz DoubleScan  (from: X Server)
(II) NVIDIA(0): "1024x768_60"          : 1024 x  768 @  60.0 Hz  (from: X Server, VESA)

You can then explicitly request the specific mode you want by name
(there is probably a mode named something like "1280x1024_60").
In your X config file, request "1280x1024_60" (or whatever you found
listed in the modepool in the verbose X log), rather than "1280x1024".

I hope that helps,
- Andy Ritger


On Tue, 23 May 2006, MillTek wrote:

> Alan,
> Thanks for the response.  Here is a portion of my xorg.log;
> 
> Is this what you were referring to??
> 
> 
> (II) Setting vga for screen 0.
> (**) NVIDIA(0): Depth 24, (--) framebuffer bpp 32
> (==) NVIDIA(0): RGB weight 888
> (==) NVIDIA(0): Default visual is TrueColor
> (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
> (**) NVIDIA(0): Enabling RENDER acceleration
> (II) NVIDIA(0): NVIDIA GPU GeForce FX 5200 at PCI:2:0:0
> (--) NVIDIA(0): VideoRAM: 131072 kBytes
> (--) NVIDIA(0): VideoBIOS: 04.34.20.18.00
> (II) NVIDIA(0): Detected AGP rate: 8X
> (--) NVIDIA(0): Interlaced video modes are supported on this GPU
> (--) NVIDIA(0): Connected display device(s) on GeForce FX 5200 at PCI:2:0:0:
> (--) NVIDIA(0):     ViewSonic VA912-3SERIES (CRT-0)
> (--) NVIDIA(0): ViewSonic VA912-3SERIES (CRT-0): 350 MHz maximum pixel clock
> (II) NVIDIA(0): Assigned Display Device: CRT-0
> (II) NVIDIA(0): Validated modes:
> (II) NVIDIA(0):     "1280x1024"
> (II) NVIDIA(0):     "1024x768"
> (II) NVIDIA(0):     "800x600"
> (II) NVIDIA(0):     "640x480"
> (II) NVIDIA(0): Virtual screen size determined to be 1280 x 1024
> (--) NVIDIA(0): DPI set to (85, 86); computed from "UseEdidDpi" X config 
> option
> (--) Depth 24 pixmap format is 32 bpp
> (II) do I need RAC?  No, I don't.
> 
> 
> 
> Alan Cox wrote:
> > On Maw, 2006-05-23 at 13:30 -0500, MillTek wrote:
> >   
> >> Hi,
> >> I've tried everything to get my LCD to operate at 60Hz but X persists in 
> >> running it at 75Hz. Can I get help here or is there somewhere better I 
> >> should go. I've tried the support forums for my Linux Distro but that 
> >> hasn't worked.
> >>     
> >
> > If your display has DDC as is usual for any vaguely modern display the X
> > server will be picking the modes the monitor says it supports. What
> > modes are listed in the log when X starts ?
> >
> >
> >   
> 
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