Re: [gentoo-desktop] Re: MacBook Intel GMA950 w/ Dell 2407WFP monitor - display problems

[Joe]

On 4-Dec-07, at 1:06 PM, Duncan wrote:

> Donnie Berkholz <dberkholz@g.o> posted
> 20071204200451.GK29076@supernova, excerpted below, on  Tue, 04 Dec
> 2007
> 12:04:51 -0800:
>
>> Hmmm. If you try a slightly lower-resolution mode (say the
>> 1600x1200 you
>> tried earlier), or the same mode with a lower refresh rate (50Hz
>> maybe?), does that work? The other OS's could be cheating their
>> refresh
>> rate a bit. Also, do you have the manual for your monitor? That
>> may have
>> details on the precise numbers. You could verify that the vertical
>> refresh and horizontal rates are correctly detected, or specify them
>> manually in xorg.conf.
>
> More practically for those (such as myself) who often buy used
> monitors... Google! =8^)  Put in the make and model number, and
> I've yet
> to have Google fail to find at least /one/ site with the frequencies
> listed.
Okay, I got the following specifications directly off the Dell page:

Dell 2407WFP

Horizontal Scan Frequency kHz
30 kHz to 81 kHz (automatic)

Vertical Scan Frequency Frequency kHz
56 Hz to 76 Hz (automatic) ), exception 1920 x 1200 at 60 Hz only

Optimal Resolution
1920 x 1200 at 60 Hz

Preset Display Modes

     * VESA, 720 x 400 - 31.5 kHz Horizontal, 70.0 Hz Vertical, 28.3 MHz
     * VESA, 640 x 480 - 31.5 kHz Horizontal, 59.9 Hz Vertical, 25.2 MHz
     * VESA, 640 x 480 - 37.5 kHz Horizontal, 75.0 Hz Vertical, 31.5 MHz
     * VESA, 800 x 600 - 37.9 kHz Horizontal, 60.3 Hz Vertical, 40.0 MHz
     * VESA, 800 x 600 - 46.9 kHz Horizontal, 75.0 Hz Vertical, 49.5 MHz
     * VESA, 1024 x 768 - 48.4 kHz Horizontal, 60.0 Hz Vertical, 65.0  
MHz
     * VESA, 1024 x 768 - 60.0 kHz Horizontal, 75.0 Hz Vertical, 78.8  
MHz
     * VESA, 1152 x 864 - 67.5 kHz Horizontal, 75.0 Hz Vertical, 108 MHz
     * VESA, 1280 x 1024 - 64.0 kHz Horizontal, 60.0 Hz Vertical, 108  
MHz
     * VESA, 1280 x 1024 - 80.0 kHz Horizontal, 75.0 Hz Vertical, 135  
MHz
     * VESA, 1600 x 1200 - 75.0 kHz Horizontal, 60.0 Hz Vertical, 162  
MHz
     * VESA, 1920 x 1200 - 74.0 kHz Horizontal, 60.0 Hz Vertical, 154  
MHz

I tried using lower refresh rates (~50Hz) at 1600x1200, but that  
didn't do anything.

> Also, I don't know what reduced blanking is all about, but I do
> know know
> I've had very good luck generating custom modelines using Kolas'
> custom
> modeline generator.  There's several sites on the net running the
> script
> and it can be googled if one goes down, but here's the one I've got
> in my
> bookmarks:
>
> http://koala.ilog.fr/cgi-bin/nph-colas-modelines

I'm a little bit confused as to what I should input there. Since I  
want a 60Hz vertical refresh rate, that means I enter '60' as my max  
and min refresh rate, correct? Does the same also apply to the  
horizontal scan frequency? What about the bandwidth?

I tried entering the following information:

Max Bandwidth: 154 Mhz
Min Bandwidth: 154 Mhz
Max Vertical Frequency: 60 Hz
Min Refresh Rate: 60 Hz
Max Horizontal Frequency: 74 Khz
Min Horizontal Frequency: 74 Khz

And got the following results:
'# RESOLUTION TOO LOW: 1920 x 1200'

I also got the same results when I set the horizontal scan frequency  
to 30-81 Khz.

Thanks,

Joe
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