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Old 03-05-08, 12:19 PM   #1
mattlbaker
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Join Date: Mar 2008
Posts: 3
Default twinview dual screens not working

I have two monitors set up via twinview on Fedora 8. I setup this configuration about 4 months ago and it has been working ever since. I restarted a couple days ago and now my ViewSonic VX2235wm monitor does not work. (By doesn't work I mean that I see it boot on that screen but when the login screen comes up that screen just turns black)

The two monitors I have are

ViewSonic VX2235wm and ViewSonic VG920

I hand coded my xorg.conf like 4 months ago, so I'm sure there are some minor problems in it, but it has been working fine for 4 months also.

Looking through the Xorg.0.log I get a warning

(WW) No monitor specified for screen "Screen0".

This one is easy. If I add a monitor “Monitor0” to the screen part it this warning goes away, but my VX2235wm still is blank.

I get some more warnings further down.

(WW) NVIDIA(GPU-0): Unable to read EDID for display device DFP-0
..
(WW) NVIDIA(0): No valid modes for "1680x1050,NULL"; removing.
..
(WW) NVIDIA(0): Unable to get display device DFP-0's EDID; cannot compute DPI
(WW) NVIDIA(0): from DFP-0's EDID.


I don't know how to get around this one. I'm sure some update caused this problem. I don't want to wait for another update to fix this problem. I'm using the livna release of the nvidia driver, because it is easy. I realize that because of this I probably won't be able to get it to read the EDID information from the device until they provide a new driver. I'm just wondering if I can specify some additional values in the xorg.conf so that it does not have to auto detect from the display device. I have the HorizSync and VertRefresh set. Do I need to set a modeline?



Other information:
Unfortunately I don't have a previous Xorg.0.log to see how it was working before. I do however have another computer running a previous version of the os with the same setup. It has the same video card and monitors. It is working fine. Here is an excerpt from its Xorg.0.log. Maybe this will help.

(--) NVIDIA(0): Connected display device(s) on GeForce 8600 GT at PCI:1:0:0:
(--) NVIDIA(0): ViewSonic VX2235wm (DFP-0)
(--) NVIDIA(0): ViewSonic VG920 (DFP-1)
(--) NVIDIA(0): ViewSonic VX2235wm (DFP-0): 330.0 MHz maximum pixel clock
(--) NVIDIA(0): ViewSonic VX2235wm (DFP-0): Internal Dual Link TMDS
(--) NVIDIA(0): ViewSonic VG920 (DFP-1): 330.0 MHz maximum pixel clock
(--) NVIDIA(0): ViewSonic VG920 (DFP-1): Internal Dual Link TMDS
(II) NVIDIA(0): Assigned Display Devices: DFP-0, DFP-1
(II) NVIDIA(0): Validated modes:
(II) NVIDIA(0): "1680x1050+1280+0,1280x1024+0+26"
(II) NVIDIA(0): "1680x1050,NULL"
(II) NVIDIA(0): Virtual screen size determined to be 2960 x 1050
(--) NVIDIA(0): DPI set to (90, 88); computed from "UseEdidDpi" X config
(--) NVIDIA(0): option
(**) NVIDIA(0): Enabling 32-bit ARGB GLX visuals.
Attached Files
File Type: log Xorg.0.log (27.3 KB, 88 views)
File Type: txt xorg.conf.txt (1.7 KB, 108 views)
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Old 03-05-08, 02:40 PM   #2
mattlbaker
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Join Date: Mar 2008
Posts: 3
Default Re: twinview dual screens not working

here is my nvidia-debug-log also
Attached Files
File Type: log nvidia-bug-report.log (129.3 KB, 97 views)
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Old 03-24-08, 11:10 AM   #3
mattlbaker
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Join Date: Mar 2008
Posts: 3
Default Re: twinview dual screens not working

Solved by unplugging and replugging in all cables, and also routing monitor cables away from power cables.
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