Go Back   nV News Forums > Linux Support Forums > NVIDIA Linux

Newegg Daily Deals

Reply
 
Thread Tools
Old 12-08-06, 05:36 PM   #25
netllama
NVIDIA Corporation
 
Join Date: Dec 2004
Posts: 8,763
Default Re: Monitor is not detected at all, and ConnectedMonitor / UseDisplayDevice do not help.

Thanks. With your binary EDID, I'm able to reproduce this problem, and have opened bug 273796.
netllama is offline   Reply With Quote
Old 12-08-06, 07:52 PM   #26
alaric
Cyber Jedi
 
alaric's Avatar
 
Join Date: Aug 2003
Location: Amsterdam
Posts: 75
Exclamation Re: (SOLVED) Monitor is not detected at all, and ConnectedMonitor / UseDisplayDevice

This comment is for other users that might read this who have the same problem(s).

To summarize:

1) The (CRT) monitor, connected to the DVI output, is not detected at all.
2) The EDID is garbled.

These are two seperate problems. The first problem stems from the fact that a CRT connected to the DVI plug can be seens as being a DFP. You can solve this by using the Option "ConnectedMonitor" "CRT-1" (The '1' means the DVI plug for the card that I own).

An additional problem was that, because the EDID was garbled, the above solution did not work with driver 1.0-8776. It does work with driver 1.0-9631 however.

Nevertheless, in order to solve the garbled EDID (which is the result of the driver thinking that it's EDID version 2.0, while it's not) is to use Option "CustomEDID".

The following Device section gives me a perfect result:

Code:
# The DVI output plug on the FX5200 card with the VMP17
# (IIyama Vision Master Pro17 - MT-9017T) connected (using a DVI->VGA
# adaptor). The VMP17 gives a wrong EDID header, therefore the EDID is
# replaced with one from the file VMP17edid.bin. Moreover, this EDID
# (apart from the header directly from the monitor) contains wrong
# frequencies (too low), therefore also EdidFreqs and EdidMaxPClkCheck
# are being ignored.
Section "Device"
        Identifier      "FX5200_DVI_VMP17"
        Driver          "nvidia"
        BusID           "PCI:1:0:0"
        Screen          0
        Option          "IgnoreDisplayDevices" "DFP, TV"
        Option          "ConnectedMonitor" "CRT-1"
        Option          "CustomEDID" "CRT-1:/etc/X11/VMP17edid.bin"
        Option          "ModeValidation" "CRT-1: NoEdidMaxPClkCheck"
        Option          "HorizSync"   "CRT-1: 27-96"
        Option          "VertRefresh" "CRT-1: 50-160"
EndSection
The used file /etc/X11/VMP17edid.bin is attached as VMP17edid.bin.gz and is the same as what my IIyama Vision Master Pro17 sends to the card when connected to the VGA plug (see startx -- -logverbose 6) but with the first 8 bytes replaced with "00 ff ff ff ff ff ff 00" and byte 128 replaced to fix the checksum.

Now going to get TwinView working again,
Alaric
Attached Files
File Type: gz VMP17edid.bin.gz (112 Bytes, 105 views)
__________________
Get my email address from my homepage.

Last edited by alaric; 12-08-06 at 08:06 PM.
alaric is offline   Reply With Quote
Old 12-08-06, 08:55 PM   #27
alaric
Cyber Jedi
 
alaric's Avatar
 
Join Date: Aug 2003
Location: Amsterdam
Posts: 75
Default Re: Monitor is not detected at all, and ConnectedMonitor / UseDisplayDevice do not he

Lonni,

my IIyama Vision Master Pro410 (A702HT, manufactured July 2000) suffers from the exact same problems. However, because in this case the raw EDID starts with 0x00, the driver didn't mistake it for an EDID version 2.0 and simply dediced to ignore the EDID (cannot read EDID for device DFP-0).

Again, when I replace the first 8 bytes, I get sane results. So, I am starting to get the feeling that the nvidia drivers could do better: apparently there are more monitors out there that don't start with 00 ff ff ff ff ff ff 00.

I've attached the raw EDID of this monitor too (it looks quite different).

Alaric
Attached Files
File Type: gz edid-file.gz (86 Bytes, 90 views)
__________________
Get my email address from my homepage.
alaric is offline   Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 09:05 AM.


Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 1998 - 2014, nV News.