Xorg changing modes

[Greg 'groggy' Lehey]

On Thursday, 14 July 2005 at 22:05:31 -0700, Ross Penner wrote:
> I've been having trouble getting Xorg to change video modes. I want it
> to run in 1280x1024 but it drops to 640x480 when I test it. I used the
> handbook as my guide.
>
> My hardware is pretty old. I have a PIII 500 with a voodoo 3 (agp).
>
> I've attached my Xorg.conf as well as the log file.
>
> hopefully that all worked out as I'm typing this out in links. Thanks
> for any help I can get, This problem is baffleing me.

OK, the way to look at this is to scan the log file for the
resolution:

  $ grep 1280x1024 Xorg.0.log
  (II) TDFX(0): Not using default mode "1280x1024" (hsync out of range)
  (II) TDFX(0): Not using default mode "1280x1024" (hsync out of range)
  (II) TDFX(0): Not using default mode "1280x1024" (hsync out of range)
  (II) TDFX(0): Not using mode "1280x1024" (no mode of this name)
  (II) TDFX(0): 1280x1024 at 75Hz

Those first three lines are pretty clear.  But why?

  $ grep sync Xorg.0.log
  (II) TDFX(0): Monitor0: Using default hsync range of 28.00-33.00 kHz
  (II) TDFX(0): Not using default mode "640x350" (hsync out of range)
  (II) TDFX(0): Not using default mode "320x175" (hsync out of range)
  (many more)

OK, a horizontal sync of 33 kHz is definitely far too low for that
kind of resolution.  Looking at the X config file, you have:

> Section "Monitor"
> 	#DisplaySize	  370   300	# mm
> 	Identifier   "Monitor0"
> 	VendorName   "HIQ"
> 	ModelName    "L90D+ D-SUB"
>  ### Uncomment if you don't want to default to DDC:
> #	HorizSync    31.0 - 83.0
> #	VertRefresh  56.0 - 0.0
> 	Option	    "DPMS"
> EndSection

That's funny, because X should recognize the commented-out values, but
it looks as if it can't find any information about the monitor by
itself.  Try uncommenting the two lines.

Greg
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