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Old 05-25-06, 04:31 AM   #1
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Join Date: May 2006
Posts: 4
Unhappy Asus a8n-vm csm DVI-problem


I've been trying to find a solution to use DVI-output to Pana AE700-projector. I've tried pretty much every option I've found on this forum but no luck yet.

The linux text-console works thru the DVI-HDMI-cable, but for some reason I can't make Xorg 7.0 to recognize that the DVI-cable is attached, and even then it doesn't seem to send a signal.

If I don't use any of the UseDisplayDevice, IgnoreDisplayDevices or ConnectedMonitor, it reports to find TV-0. If I use ignore TV-0, it reports that only CRT-0 is connected. Ignoring both TV-0 and CRT-0 it reports that no display is connected, and reverts to CRT-0. Forcing DFP-0 with UseDisplayDevice without ConnectedMonitor also fails.

Setting ConnectedMonitor as DFP makes X think that something is connected, and ignoring all EDID data (which the projector AFAIK doesn't provide) results in a happy Xorg server, but no data is recognized by the projector. Usually I can still switch to VT1-6 and get the text-console thru the DVI-HDMI-cable, and switching back to VT7 I get a blank screen, and no picture menus are available.

I've also tried it with a variety of different modes in addition to the 1280x720 custom modelines. Attached two outputs from nvidia-bug-report.sh, one with forced ConnectedMonitor and one without.

Attached Files
File Type: zip nvidia-bug-report.zip (46.7 KB, 145 views)
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Old 05-25-06, 11:31 AM   #2
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Default Re: Asus a8n-vm csm DVI-problem

When the driver is finding a TV, are you getting a picture on the TV? I'd like to see a bug report that captures the TV detection, as that may be the solution to this problem.

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Old 05-25-06, 01:17 PM   #3
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Default Re: Asus a8n-vm csm DVI-problem

The only connected cable during the attached log is the DVI->HDMI cable to projector, nothing is connected onto the TV-out pin-header on the mo-bo (I don't even have a suitable cable available to test if it actually outputs something there). If I connect the VGA cable, it reports that only CRT-0 is detected. Trying to ignore TV-0 it reports:
(**) NVIDIA(0): Option "NoLogo" "true"
(**) NVIDIA(0): Option "NvAGP" "3"
(**) NVIDIA(0): Option "IgnoreDisplayDevices" "TV"
(**) NVIDIA(0): Option "UseDisplayDevice" "DFP"
(==) NVIDIA(0): Using HW cursor
(**) NVIDIA(0): Enabling RENDER acceleration
(==) NVIDIA(0): Video key set to default value of 0x101fe
(II) NVIDIA(0): Support for GLX with the Damage and Composite X extensions is
(II) NVIDIA(0):     enabled.
(WW) NVIDIA(0): No connected display devices detected; assuming 1 CRT
(WW) NVIDIA(0): Unable to read EDID for display device CRT-0
(II) NVIDIA(0): NVIDIA GPU GeForce 6150 at PCI:0:5:0
(--) NVIDIA(0): VideoRAM: 262144 kBytes
(II) NVIDIA(0): GPU Architecture: 0x40
(II) NVIDIA(0): GPU Implementation: 0x4e
(II) NVIDIA(0): GPU Revision: 0xa2
(--) NVIDIA(0): VideoBIOS:
(--) NVIDIA(0): Found 2 CRTCs on board
(II) NVIDIA(0): Supported display device(s): CRT-0, DFP-0, TV-0
(II) NVIDIA(0): Bus detected as Integrated
(--) NVIDIA(0): Interlaced video modes are supported on this GPU
(II) NVIDIA(0): VPES : 1
(II) NVIDIA(0): SPS  : 2
...(timing constraint info)...
(--) NVIDIA(0): Connected display device(s) on GeForce 6150 at PCI:0:5:0:
(--) NVIDIA(0):     CRT-0
(--) NVIDIA(0): CRT-0: 350.0 MHz maximum pixel clock
(--) NVIDIA(0): 
(--) NVIDIA(0): --- EDID for CRT-0 ---
(--) NVIDIA(0): 
(--) NVIDIA(0): No EDID Available.
(--) NVIDIA(0): 
(--) NVIDIA(0): --- End of EDID for CRT-0 ---
(--) NVIDIA(0): 
(WW) NVIDIA(0): Option "UseDisplayDevice" requested "DFP", but no unused DFPs
(WW) NVIDIA(0):     are available.
(II) NVIDIA(0): Option "UseDisplayDevice" "DFP" converted to "".
(WW) NVIDIA(0): Unable to find any of the requested display device "" in the
(WW) NVIDIA(0):     list of available display devices "CRT-0".
Attached Files
File Type: log nvidia-bug-report.log (88.7 KB, 142 views)
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Old 05-26-06, 03:23 AM   #4
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Default Re: Asus a8n-vm csm DVI-problem

I made a test with a TFT-monitor connected thru DVI, and it works without a problem. Problem seems to be reduced to a display device that doesn't support EDID.

Strangely, if I have both VGA and DVI->HDMI connected, the text console is available only from the digital output, so the hardware side does seem to detect that something is connected there.

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Old 05-29-06, 07:26 AM   #5
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Default Re: Asus a8n-vm csm DVI-problem

Made further tests by hooking the dvi-out to an oscilloscope and a switchbox. Option "ConnectedMonitor" "DFP-0" was used to force using DVI-out even if it a connected device is no detected. Option "UseEDID" "false" and "ExactModeTimingsDVI" "true" were used to ignore monitor preferences. A modeline for 1280x720@50Hz was used.

My highly unscientific but easily reproducible test-procedure:
Start X (checkpoint 1), switch to VT1 text console (checkpoint 2+3), switch back to VT7 running X (checkpoint 4).
The connection was switched between checks 2 and 3, resulting in 4 cases:
  1. TFT 1, 2, 3, 4
  2. TFT 1, 2, projector 3, 4
  3. Projector 1, 2, 3, 4
  4. Projector 1, 2, TFT 3, 4
Checkpoint 1:
  1. a, b: Data, picture shows on TFT
  2. c, d: the DVI-datalines remain silent, no data, no picture.
Checkpoint 2, 3:
  • DVI-out has data in all cases (usually picture as well, but not always)
Checkpoint 4:
  1. Data, picture
  2. no data
  3. no data
  4. Data, picture
Switching the connection from TFT to projector when TFT is receiving data (after check 1 or 4): projector shows the picture and recognizes the resolution. Test was repeated a few times, alternating the switch box connectors to display devices.
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