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Zilvermeeuw 06-03-2012 03:12 AM

Second monitor, EDID checksum is invalid
 
Hi all!

I have two 22" CRT's, of Sun. I run Fedora 16. My video card: nVidia Corporation G72 [GeForce 7300 SE/7200 GS]. First monitor connected to VGA output, second connected with a VGA adapter to the digital connector.

Suddenly, after a reboot, my second monitor does not give any image. exchanging the two cables of the monitors, gives no image on the first monitor. So both monitors are OK.

/var/log/messages gives:
Jun 3 10:02:00 richard kernel: [137548.891560] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 77
Jun 3 10:02:00 richard kernel: [137548.891563] Raw EDID:
Jun 3 10:02:00 richard kernel: [137548.891564] 00 ff ff ff ff ff ff 00 ff ae 80 05 4c 57 18 02
Jun 3 10:02:00 richard kernel: [137548.891566] 31 0b 01 03 0e 28 1e 96 28 0c c9 a0 57 47 9b 27
Jun 3 10:02:00 richard kernel: [137548.891567] 12 48 4c ff ff 80 a9 4f 81 90 71 90 81 8f 81 87
Jun 3 10:02:00 richard kernel: [137548.891569] 71 86 61 4f 81 b4 1a 4f 40 30 62 b0 32 40 ff ff
Jun 3 10:02:00 richard kernel: [137548.891571] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Jun 3 10:02:00 richard kernel: [137548.891572] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Jun 3 10:02:00 richard kernel: [137548.891574] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Jun 3 10:02:00 richard kernel: [137548.891575] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
Jun 3 10:02:00 richard kernel: [137548.891579] nouveau 0000:01:00.0: DVI-I-1: EDID block 0 invalid.
Jun 3 10:02:00 richard kernel: [137548.891582] [drm] nouveau 0000:01:00.0: DDC responded, but no EDID for DVI-I-1
I connected an other monitor --> also no image.
I search a lot on the internet, but no luck so far.

Does anyone has a tip how to solve this?

Zilvermeeuw 06-04-2012 05:13 AM

I did the reboot after a kernel update.
But selecting the original kernel during startup, does not solve this problem.

Any tips?

RockDoctor 06-04-2012 07:50 AM

My system has only one monitor, but it gives an invalid EDID:
Code:

Jun  3 10:43:42 Pyrope kernel: [ 3556.795262] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, remainder is 74
Jun  3 10:43:42 Pyrope kernel: [ 3556.795271] Raw EDID:
Jun  3 10:43:42 Pyrope kernel: [ 3556.795277]  c0 16 10 1e 01 18 02 14 00 4f 04 20 07 10 14 00
Jun  3 10:43:42 Pyrope kernel: [ 3556.795282]  4f 11 01 03 08 2f 1e 78 0a b5 34 a5 56 4a 9a 25
Jun  3 10:43:42 Pyrope kernel: [ 3556.795286]  10 50 54 af cf 00 81 80 81 8f 95 00 95 0f 01 01
Jun  3 10:43:42 Pyrope kernel: [ 3556.795291]  01 01 01 01 01 01 1c 39 90 30 62 1a 27 40 68 b0
Jun  3 10:43:42 Pyrope kernel: [ 3556.795295]  36 00 d9 28 11 00 00 18 00 00 00 fe 00 0a 20 20
Jun  3 10:43:42 Pyrope kernel: [ 3556.795299]  20 20 20 20 20 20 20 20 20 20 00 00 00 fc 00 4d
Jun  3 10:43:42 Pyrope kernel: [ 3556.795304]  42 57 2d 53 45 52 49 41 4c 0a 20 20 00 00 00 ff
Jun  3 10:43:42 Pyrope kernel: [ 3556.795308]  00 0a 20 20 20 20 20 20 20 20 20 20 20 20 00 33

My solution is to create an /etc/X11/xorg.conf file with all of the appropriate info for my monitor. Instead of the full-blown xorg.conf file, placing the appropriate pieces in files within /etc/X11/xorg.conf.d/ would work too. I created my xorg.conf file by editing the xorg.conf.new file obtained when running (as root)
Code:

Xorg :1 -configure
and moving it from /root to /etc/X11. HTH

Zilvermeeuw 06-05-2012 04:41 AM

I created a xorg.conf and put in in /etc/X11. After a restart of X, the computer did not respond anymore. Also external access (ssh) did not work. I had to make a Hard Power Off.

After reboot, it could not find the partition "/" (software raid). It was corrupted. After playing with mdadm and fschk, I was able to restore the raid, but all files in it where damaged...... Boehoe!!

Now it is updating a fresh install..... Both monitors are working now.....

I think I still have all my data.....

I do not know, what went wrong. I do not think it was the xorg.conf though.

Zilvermeeuw 06-05-2012 08:03 AM

After the update the same situation as before.
EDID errors and no second monitor.

RockDoctor 06-05-2012 02:57 PM

Does creating xorg.conf (with both monitors powered up) help? I know of no reason why this should clobber the computer. Worst case should be it doesn't work - in which case boot the live CD, mount the hard drive's filesystem, delete xorg.conf and reboot, leaving you where you are now.

Zilvermeeuw 06-05-2012 11:17 PM

Quote:

Originally Posted by RockDoctor (Post 4696254)
Does creating xorg.conf (with both monitors powered up) help? I know of no reason why this should clobber the computer. Worst case should be it doesn't work - in which case boot the live CD, mount the hard drive's filesystem, delete xorg.conf and reboot, leaving you where you are now.

I did created an xorg.conf and booted with both monitos powered up.
It should not clobber my computer. And normaly you can delete the xorg.conf. But my software raid was messed up.

It is my home server (at least the two virtual machines are). I am not trying this on this machine again.

I will build another system (same graphics card, almost the same hardware, no software raid) to test this further.

Thanks for your help! I will post the results here.

Zilvermeeuw 07-04-2012 01:14 PM

The other system has a malfunctional PCI-E bus.....
But....
After a kernel update on my Fedora16 system, the EDID problem is gone, and my second monitor is working again!!


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