On 4-Dec-07, at 1:06 PM, Duncan wrote:
Donnie Berkholz <[EMAIL PROTECTED]> posted
[EMAIL PROTECTED], 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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