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Old 03-01-09, 07:00 PM   #1
fearpi
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Default Second monitor not detected correctly

I am using a laptop with an LCD display that is correctly detected as DFP-0 with a native resolution of 1280x800.

I have an external LCD display that has a native resolution of 1280x1024. It is attached directly via a VGA cable. This external display is detected correctly and works fine at 1280x1024 in Windows. Once upon a time it worked just as well under Ubuntu, but at some point while I was using Ubuntu 8.04 it would only be detected with a max resolution of 1152x864 (or 1360x768). Upgrading to 8.10 has not fixed this. I have tried versions 177 and 180 as well as some older versions of the NVidia driver and nvidia-settings still recognizes this external monitor as CRT-0 and refuses to recognize the native 1280x1024. Surely there must be a way to fix this as it worked once upon a time in Ubuntu and still does under Windows.
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Old 03-03-09, 11:57 PM   #2
fearpi
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Default Re: Second monitor not detected correctly

Anyone?
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Old 03-04-09, 08:21 AM   #3
cosine
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Default Re: Second monitor not detected correctly

You might have to change the EDID (GIYF).

You should also be able to override detection and specify the modelines yourself.
Option "UseEdidFreqs" "FALSE"
Option "UseEdidDpi" "FALSE"
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Old 03-13-09, 11:51 AM   #4
fearpi
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Default Re: Second monitor not detected correctly

Thanks, that did the trick. I dual boot Windows, so I used Phoenix EDID designer to grab an EDID file that was saved in the registry, then exported it (and since that program exports it to a plaintext file, then wrote a script to convert it to an actual 128-byte file), and used that. Bit of a pain, since this monitor used to work automatically with NVidia's drivers under linux, but it gets the job done for me.
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