CentOS - Jun 2005 - Re: screen fonts -- LCD and Analog Connections ...

Ryan wrote:
> I did, 1024x768.
> Sorry, analog
Matthew Miller wrote:
> Maybe the problem is just in that adjustment, then.
Yes.  You need to have your signaling _exact_ when dealing with LCDs.

Some are very good at taking the timings of VESA standards.  But some
support some eccentric Windows timings that are _not_ the exact same
as VESA.  Or maybe you have configured your monitor for X with
bandwidths that exceed the typical VESA modelines.

E.g., did you upgrade from a CRT and just leave your X configuration
intact?  If so, then you might be sending 70, 72, 75 or 85Hz modes
for 1024x768.  And even though your LCD might support that analog
signaling, it's not as ideal as using the VESA standard modes (typically
60Hz for 1024x768 on a LCD).

You need to open up your LCD user's manual, find the resolution you
want, and input the _exact_ 1) Bandwidth 2) Horizonal Sync and 3)
Vertical Sync for that mode into a modeline calculator.  Then put those
modelines into your XF86Config/xorg.conf.

Otherwise, at 1024x768, you're going to see a lot of the distortions.
It has nothing to do with fonts.

Ideally you should be using DVI and not an analog connector.  That
removes the problem entirely.


--
Bryan J. Smith   mailto:b.j.smith at ieee.org

I don't know where to make the adjustments you've suggested- I've
posted
my monitor's specs and my xorg.conf below, any help is greatly appreciated.

Thanks!!

Here are the specs of my monitor:
http://www.sonystyle.com/is-bin/INTERSHOP.enfinity/eCS/Store/en/-/USD/SY_DisplayProductInformation-Start?CategoryName=cpu_Refurbished_Displays&ProductSKU=SDMHS53%2fBT%2fBSTOCK&TabName=specs&var2
Here is the relevant part of xorg.conf

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "Monitor Vendor"
	ModelName    "LCD Panel 1024x768"
	DisplaySize  300	230
	HorizSync    28 - 61
	VertRefresh  48 - 75
	Option	    "dpms"
EndSection

Section "Device"
	Identifier  "Videocard0"
	Driver      "nv"
	VendorName  "Videocard vendor"
	BoardName   "NVIDIA GeForce 4 MX (generic)"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Videocard0"
	Monitor    "Monitor0"
	DefaultDepth     24
	SubSection "Display"
		Viewport   0 0
		Depth     16
		Modes    "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     24
		Modes    "1024x768" "800x600" "640x480"
	EndSubSection
EndSection

Section "DRI"
	Group        0
	Mode         0666
EndSection



Bryan J. Smith <b.j.smith at ieee.org> wrote:
> Ryan wrote:
> 
>>I did, 1024x768.
>>Sorry, analog
> 
> 
> Matthew Miller wrote:
> 
>>Maybe the problem is just in that adjustment, then.
> 
> 
> Yes.  You need to have your signaling _exact_ when dealing with LCDs.
> 
> Some are very good at taking the timings of VESA standards.  But some
> support some eccentric Windows timings that are _not_ the exact same
> as VESA.  Or maybe you have configured your monitor for X with
> bandwidths that exceed the typical VESA modelines.
> 
> E.g., did you upgrade from a CRT and just leave your X configuration
> intact?  If so, then you might be sending 70, 72, 75 or 85Hz modes
> for 1024x768.  And even though your LCD might support that analog
> signaling, it's not as ideal as using the VESA standard modes
(typically
> 60Hz for 1024x768 on a LCD).
> 
> You need to open up your LCD user's manual, find the resolution you
> want, and input the _exact_ 1) Bandwidth 2) Horizonal Sync and 3)
> Vertical Sync for that mode into a modeline calculator.  Then put those
> modelines into your XF86Config/xorg.conf.
> 
> Otherwise, at 1024x768, you're going to see a lot of the distortions.
> It has nothing to do with fonts.
> 
> Ideally you should be using DVI and not an analog connector.  That
> removes the problem entirely.
> 
> 
> --
> Bryan J. Smith   mailto:b.j.smith at ieee.org
> 
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