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Old 01-16-07, 10:29 PM   #1
mike rosa
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Default GeForce4 4200 Go -- max VGA port resolution

hi all,

i'm looking for the spec for the max resolution of an external monitor. If you know where i can find the spec, i would appreciate hearing back from you. The GeForce4 4200 Go is a mobile laptop notebook video card. It has no problems supporting the laptop's 1920x1200 screen. I'm just trying to find the spec for the max res out the back, which is a VGA port.

tia
mike
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Old 01-17-07, 02:03 AM   #2
Thunderbird
 
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Default Re: GeForce4 4200 Go -- max VGA port resolution

In general the max VGA resolution is limited by the maximum clock of the RAMDAC. I don't know what the exact value is for your 4200GO but in general this value is around 300MHz or even a lot more. A resolution of 1600x1200 @60Hz needs a pixelclock of about 150MHz, so the maximum resolution of your card is quite a bit higher than that.

The issue is that at very high resolutions the quality of the VGA signal the card can output is in general not as good as at lets say 1024x768. Second on a lot of laptops the VGA output is of not that great quality which also limits image quality.
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Old 01-20-07, 07:15 PM   #3
mike rosa
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Default Re: GeForce4 4200 Go -- max VGA port resolution

Thanks. So if i understand it correctly, in terms of the RAMDAC limit, the card ought to be able to supply 1920x1200 at 60Hz when only the external monitor is being driven. However, if 150MHz is needed for 1600x1200@60Hz, then simultaneously driving the laptop display at 1920x1200@60Hz and external monitor at, e.g., 1600x1200@60Hz would require a RAMDAC max clock rate of about 300MHz.

If so then the card might be operating at its limit when driving 1920x1200@60Hz and 1600x1200@60Hz, and might not be able to drive dual 1920x1200@60Hz.

the content of /var/log/Xorg.0.log includes these lines:

## grep -i hz /var/log/Xorg.0.log
(--) NVIDIA(0): CRT-0: 350.0 MHz maximum pixel clock
(--) NVIDIA(0): Sharp (DFP-0): 165.0 MHz maximum pixel clock

I'm not sure if these specs were reported (probed) by the card or by the displays.

grep'ing for ramdac does not yield any clock info, and grep'ing for clock yields the same as hz.

DFP-0 is the laptop's display and CRT-0 is the external LCD connected through a VGA connector.
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Old 01-20-07, 09:47 PM   #4
mike rosa
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Default Re: GeForce4 4200 Go -- max VGA port resolution

...... is color-depth also a factor ?
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Old 01-20-07, 10:53 PM   #5
mike rosa
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Default Re: GeForce4 4200 Go -- max VGA port resolution

based on the idea that the clock rate of the RAMDAC is the limiting factor, i tried modifying several other xorg.conf parameters.

in the past, i have been running the laptop and external LCD at 1920x1200@60 and 1600x1200@60 respectively, without a problem, though the external LCD is actually a 1920x1200 panel.

so i began by altering the metamodes option in xorg.conf by swapping the res/rates to 1600x1200@60 for the laptop and 1920x1200@60 for the external LCD. the result upon restarting X was that only the laptop display was active. nvidia-settings reported the extern an inactive.

next i altered the same option by erasing the DFP spec and eliminating the CRT geometry spec. restarting X led to only the external LCD being active (at 1024x768).

obviously i do not have a clue, i'm just hacking away blindly.

any help would be appreciated.
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Old 01-20-07, 11:56 PM   #6
mike rosa
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Default Re: GeForce4 4200 Go -- max VGA port resolution

okay

finally have 1920x1200 on both displays, but with some "phase error"

the basic fix was to add

ModeLine "1920x1200" 154 1920 1968 2000 2080 1200 1203 1209 1235 +hsync -vsync

i scooped that off a thread on the 2407wfp

however, there is some twinkling (scroll bar of an xterm, e.g.) that seems to be fixed by using the 2407wfp OSD and altering the "phase"
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Old 01-21-07, 12:31 AM   #7
mike rosa
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Default Re: GeForce4 4200 Go -- max VGA port resolution

changing the +hsync to -hsync got rid of the "phase" problem.

fwiw, i found some other modelines and or calculators via google

#looks good Modeline "1920x1200" 154.128 1920 1968 2000 2080 1200 1203 1209 1235 -hsync -vsync
#horrible Modeline "1920x1200" 161.75 1920 2020 2052 2184 1200 1202 1208 1235 -hsync -vsync
#looks good ModeLine "1920x1200" 154 1920 1968 2000 2080 1200 1203 1209 1235 -hsync -vsync
#horrible Modeline "1920x1200" 210.68 1920 1952 2752 2784 1200 1224 1236 1261
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