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On 4-Dec-07, at 1:06 PM, Duncan wrote: |
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|
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> Donnie Berkholz <dberkholz@g.o> posted |
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> 20071204200451.GK29076@supernova, excerpted below, on Tue, 04 Dec |
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> 2007 |
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> 12:04:51 -0800: |
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> |
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>> Hmmm. If you try a slightly lower-resolution mode (say the |
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>> 1600x1200 you |
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>> tried earlier), or the same mode with a lower refresh rate (50Hz |
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>> maybe?), does that work? The other OS's could be cheating their |
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>> refresh |
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>> rate a bit. Also, do you have the manual for your monitor? That |
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>> may have |
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>> details on the precise numbers. You could verify that the vertical |
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>> refresh and horizontal rates are correctly detected, or specify them |
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>> manually in xorg.conf. |
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> |
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> More practically for those (such as myself) who often buy used |
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> monitors... Google! =8^) Put in the make and model number, and |
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> I've yet |
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> to have Google fail to find at least /one/ site with the frequencies |
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> listed. |
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Okay, I got the following specifications directly off the Dell page: |
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|
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Dell 2407WFP |
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|
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Horizontal Scan Frequency kHz |
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30 kHz to 81 kHz (automatic) |
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|
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Vertical Scan Frequency Frequency kHz |
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56 Hz to 76 Hz (automatic) ), exception 1920 x 1200 at 60 Hz only |
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|
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Optimal Resolution |
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1920 x 1200 at 60 Hz |
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|
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Preset Display Modes |
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|
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* VESA, 720 x 400 - 31.5 kHz Horizontal, 70.0 Hz Vertical, 28.3 MHz |
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* VESA, 640 x 480 - 31.5 kHz Horizontal, 59.9 Hz Vertical, 25.2 MHz |
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* VESA, 640 x 480 - 37.5 kHz Horizontal, 75.0 Hz Vertical, 31.5 MHz |
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* VESA, 800 x 600 - 37.9 kHz Horizontal, 60.3 Hz Vertical, 40.0 MHz |
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* VESA, 800 x 600 - 46.9 kHz Horizontal, 75.0 Hz Vertical, 49.5 MHz |
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* VESA, 1024 x 768 - 48.4 kHz Horizontal, 60.0 Hz Vertical, 65.0 |
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MHz |
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* VESA, 1024 x 768 - 60.0 kHz Horizontal, 75.0 Hz Vertical, 78.8 |
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MHz |
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* VESA, 1152 x 864 - 67.5 kHz Horizontal, 75.0 Hz Vertical, 108 MHz |
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* VESA, 1280 x 1024 - 64.0 kHz Horizontal, 60.0 Hz Vertical, 108 |
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MHz |
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* VESA, 1280 x 1024 - 80.0 kHz Horizontal, 75.0 Hz Vertical, 135 |
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MHz |
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* VESA, 1600 x 1200 - 75.0 kHz Horizontal, 60.0 Hz Vertical, 162 |
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MHz |
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* VESA, 1920 x 1200 - 74.0 kHz Horizontal, 60.0 Hz Vertical, 154 |
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MHz |
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|
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I tried using lower refresh rates (~50Hz) at 1600x1200, but that |
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didn't do anything. |
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|
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> Also, I don't know what reduced blanking is all about, but I do |
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> know know |
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> I've had very good luck generating custom modelines using Kolas' |
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> custom |
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> modeline generator. There's several sites on the net running the |
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> script |
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> and it can be googled if one goes down, but here's the one I've got |
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> in my |
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> bookmarks: |
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> |
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> http://koala.ilog.fr/cgi-bin/nph-colas-modelines |
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|
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I'm a little bit confused as to what I should input there. Since I |
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want a 60Hz vertical refresh rate, that means I enter '60' as my max |
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and min refresh rate, correct? Does the same also apply to the |
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horizontal scan frequency? What about the bandwidth? |
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|
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I tried entering the following information: |
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|
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Max Bandwidth: 154 Mhz |
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Min Bandwidth: 154 Mhz |
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Max Vertical Frequency: 60 Hz |
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Min Refresh Rate: 60 Hz |
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Max Horizontal Frequency: 74 Khz |
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Min Horizontal Frequency: 74 Khz |
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|
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And got the following results: |
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'# RESOLUTION TOO LOW: 1920 x 1200' |
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|
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I also got the same results when I set the horizontal scan frequency |
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to 30-81 Khz. |
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|
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Thanks, |
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|
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Joe |
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-- |
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