ModeLine settings for a Princeton PTFBVT-17 Monitor

conn-fused · 06-25-2006, 12:10 AM

Hi all,

I've recently done a kernel update on a Mandriva 2006 system. After doing so, I reinstalled the nvidia drivers (87xx).

After some time, I was able to get X to load with the nvidia drivers (it had been producing a "Screens found but none have a useable configuration" error). Unfortunately, it will only work in 1280x1024, which is to fine for this 17" monitor. I'd prefer 1024x768. Unfortunately, I don't have the right ModeLine settings for my xorg.conf file.

Here is the monitor section of my xorg.conf file:

Code:

    Section "Monitor"
    Identifier "monitor1"
    VendorName "Plug'n Play"
    ModelName "PTFBVT-17"
    HorizSync 31-83
    VertRefresh 56-76
# Added in a (failed) attempt at 1024x768 resolution
#    ModeLine "1024x768@60" 65.0 1024 1048 1184 1344 768 771 777 806 -vsync -hsync
# Monitor preferred modeline (60.0 Hz vsync, 64.0 kHz hsync, ratio 5/4)
    ModeLine "1280x1024" 108 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
# TV fullscreen mode or DVD fullscreen output.
# 768x576 @ 79 Hz, 50 kHz hsync
    ModeLine "768x576"     50.00  768  832  846 1000   576  590  595  630
# 768x576 @ 100 Hz, 61.6 kHz hsync
    ModeLine "768x576"     63.07  768  800  960 1024   576  578  590  616
EndSection

As you can see, I've tried lifting 1024x768 ModeLines from other people's posts (ie when the 1280x1024 line matched, I've tried one of their 1024x768 lines in my xorg.conf) but without success. As soon as I comment out the 1280x1024 line and/or the 1280x1024 screen subsections, I'm back to "screens found but none have a useable configuration".

Can anyone help?

tredegar · 06-25-2006, 05:54 AM

The "Modeline" entries tell X about timings. You can safely comment out all those modelines, and X will work them out for itself from the HorizSync & VertRefresh values and the display resolution.

You need to set up the "Screen" Section to look something like mine:

Code:

Section "Screen"
	Identifier	"Default Screen"
	Device		"NVIDIA Corporation NV18 [GeForce4 MX 4000 AGP 8x]"
	Monitor		"Generic Monitor"
	DefaultDepth	24
SubSection "Display"
		Depth		24
		Modes		"1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480"
	EndSubSection
EndSection

If you want to default to 1024x768, just remove the reference to "1280x1024" in the above piece of code.

HTH

kickzha · 06-25-2006, 07:04 AM

...tredegar seems right to me...

...but it may be u like to have some Modelines beside...

...the reason is, it seems that Modes like "1024x768" aso. are VESA Modes, and so the refresh rate is quite down, and even your monitor comes with DDC-Support ( and X realised that ) it seems to keep with VESA-Modes...

If im wrong i would know.

...it could be that there are Modes like "1024x768@100", and X caclculates timings by himself, i never tested...

...try the following: http://koala.ilog.fr/cgi-bin/nph-colas-modelines ... i like that much...

...of course you have to give into the 'Modes' line the Title of your Modeline (which is the thing in " ); first that one you prefer...

conn-fused · 06-27-2006, 04:35 AM

Yeah, you guys nailed that one:

With this Display subsection, I was able to go back to 1024x768.

Code:

Subsection "Display"
        Depth 24
        Modes "1024x768" "800x600"
EndSubsection

The only down side with this is that I don't have higher resolutions at my disposal. If I add a higher Mode (eg 1280x1024), enter X (at this resolution) and then resize down (either with the "Configure Desktop" application menu option or "xrandr -s 1024x768") I get a desktop that expands beyond the bounds of my monitor, instead of a resizing.

Don't feel any pressure to resolve that for me though. I very rarely switch to a higher resolution, and restarting X to do it (after editting xorg.conf to edit the Display Modes line) is not a big inconvenience.