[nylug-talk] Ubuntu Monitor/clocking/etc

[Adrian Sai-Wah TAM]

I guess you don't need a modeline in most cases, it needs only when we
are in the old days where the display card and monitor can't tell
about the resolution it supported.

I guess the only thing you need to tune is:
1. The monitor section, where you define the HorizSync and VertRefresh
correctly to reflect the capability of your monitor or the particular
refresh rate you want
2. The screen section, where you spell out the modes you want, in
preference order. So that the X server can select one for you.

Below is my copy for your reference:

====== cut here =====

Section "Monitor"
        Identifier      "Generic Monitor"
        Option          "DPMS"
        HorizSync       28-87
        VertRefresh     58-62
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "LCD Panel"
        Monitor         "Generic Monitor"
        DefaultDepth    24
        SubSection "Display"
                Depth           24
                Modes           "1680x1050" "1280x1024" "1280x960"
"1152x864" "1024x768" "" "800x600" "" "640x480"
        EndSubSection
EndSection

====== cut here =====

On 09/12/2007, Seth Rothenberg <seth at pachai.net> wrote:
> Hi, I have a monitoring problem,
> looking for some leads.
>
> I have an XPC running Ubuntu for about 6 months.
> I did a dist-upgrade about a month ago, so it's
> probably 7.10 - and I set up a new monitor on Friday,
> a Viewsonic 11444
>
> It seemed to work for a few days, but it warns me
> that I should use 1440x900
>
> Today, it got that out-of-sync-video look - unusable.
> Under the Information menu, it is saying
> H. Freq 65.5 MHz, Vert Frez 60.3 Hz
> resolution 1440 x 1050
> Pixel clock 123.1 MHz
>
> In text mode, which is legible,
> it says 31.1 KHz x 70.2 Hz @ 720x400, pexel 28.3 MHz
>
> (units might be off, I am in the basement now :-)
>
> I found the xorg config file, and there is a mode
> line that looks familiar like 1400x1050 (NOT 1440x1050)
> but I don't know how to construct one for 1440x900.
>
> Also, what happened that worked for 3 days?
>
> Should I just blindly copy one of these that Google found me
> for a Toshiba notebook?
>
> Modeline      "1440x900" 130.75 1440 1536 1688 1936 900 901 904 938
>
> Modeline      "1440x900" 105.75 1440 1488 1520 1600 900 903 909 931 +HSync -Vsync
>
>
>
> Thanks
> Seth
>
>
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