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Old 12-20-08, 09:20 AM   #1
meresda
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Default Display shifted on LG L246WP

I've got a GeForce 9400 GT connected to a LG L246WP running at 1900x1200 via DVI to HDMI. I am running openSUSE 11.1 and driver 177.82_2.6.27.7_9.1-1.1. My display is shifted up about 1/2" and to the left about 2". Checking through my Xorg.log there were some errors about the EDID contradicting itself, so I tried ignoring the EDID via my xorg.conf without any luck. Any ideas?
Thanks,
Mike
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Old 12-20-08, 06:16 PM   #2
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Default Re: Display shifted on LG L246WP

I have exactly the same problem with opensuse 11.1 64bit.

EDID from my flat panel is not acquired correctly. Flat panel is LG L245WP, connected to Gainward GeForce 9800GT via DVi-HDMI cable. Xwindow should start in 1920x1200 native mode but instead it detects flat panel as HDTV and starts in HDMI 1080p mode. screen is shifted to top-left corner and looks really ugly. This is a known problem and can be overcomed in windows by tweaking .inf files to override wrong EDID information, but how to do this in Linux???

I tried the following:
- dump edid from flat panel on another box and use it - nothing changed
- disable edid and force using a modeline - mode rejected but should be ok
no success.

this is definitely a problem with nvidia drivers. my 2nd machine with an old GF 7600GT AGP card works perfectly well with this panel... this machine is running opensuse 10.3 32bit with nvidia driver 173.14.12.
also, if I switch back to opensource 'nv' driver, panel works perfect in 1920x1200.

please help.

----------------

edit: driver 177.82 installed by hand does not work either.
Attached Files
File Type: gz nvidia-bug-report.log.gz (26.2 KB, 182 views)

Last edited by avatar:0:0:; 12-20-08 at 06:40 PM. Reason: info about new driver.
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Old 12-22-08, 03:15 PM   #3
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Default Re: Display shifted on LG L246WP

ok, problem can be workarounded by using custom EDID file.

steps:

1. shutdown (required to fully reinitialize graphics output)

2. connect your flat panel to your graphics card using old-fashioned vga (DSUB) cable

3. start linux, login to X and start nvidia-settings

4. run Acquire EDID and save edid.bin to some directory

5. add the following line to your /etc/X11/xorg.conf in Section Device for graphics adapter:
Option "CustomEDID" "DFP-0:/full/path/to/edid.bin"

DFP-0 is Digital Flat Panel connected to 1st DVI connector on your nvidia card

be sure to put proper path to edid.bin.

6. reboot (again required to fully reinitialize graphics output)

7. be happy with nice resolution
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Old 12-24-08, 03:07 PM   #4
meresda
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Default Re: Display shifted on LG L246WP

Thanks! Worked like a charm.

Quote:
Originally Posted by avatar:0:0: View Post
ok, problem can be workarounded by using custom EDID file.

steps:

1. shutdown (required to fully reinitialize graphics output)

2. connect your flat panel to your graphics card using old-fashioned vga (DSUB) cable

3. start linux, login to X and start nvidia-settings

4. run Acquire EDID and save edid.bin to some directory

5. add the following line to your /etc/X11/xorg.conf in Section Device for graphics adapter:
Option "CustomEDID" "DFP-0:/full/path/to/edid.bin"

DFP-0 is Digital Flat Panel connected to 1st DVI connector on your nvidia card

be sure to put proper path to edid.bin.

6. reboot (again required to fully reinitialize graphics output)

7. be happy with nice resolution
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Old 01-22-11, 09:11 PM   #5
Kruthers
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Default Re: Display shifted on LG L246WP

Hey, I know this is an old thread but just wanted to say that this tip saved me today while building a new system! Thank you internet!

To help out any other poor bastard madly searching google about this, I ran into this same exact issue with:

LG L246WP
Nvidia GeForce GTS-450 based video card
Ubuntu 10.10 (maverick)
drivers nvidia-current 260.19.29, and previous 260.19.06

The crazy thing is that those drivers are up to date as of Dec 2009 and contain this problem, but I previously had no problems with an older nvidia card and older drivers (same exact monitor and Ubuntu version). Regression?

There is a newer driver out (260.19.36) but it's too new to be wrapped up for ubuntu yet and since that makes it a huge hassle I was saving that as a last resort. Still, I don't think it would have fixed this problem.
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Old 03-27-11, 11:48 AM   #6
mtltmptmc
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Default Re: Display shifted on LG L246WP

Also registered to bump this issue.

Linux 2.6.32-5-amd64
NVIDIA driver version 260.19.44

The "edid_disable_exts" utility described here fixed me: http://analogbit.com/fix_nvidia_edid

(Note: Option "CustomEDID" takes a semicolon-separated list for multiple displays; my setting did not persist through a driver update)

For posterity's sake, a Windows XP analogue:
http://www.hardforum.com/showthread....post1032078646
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Old 03-27-11, 01:53 PM   #7
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Default Re: Display shifted on LG L246WP

..

Last edited by mtltmptmc; 03-27-11 at 05:18 PM. Reason: problem fixed, see edit
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Old 03-28-11, 10:38 AM   #8
danix
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Default Re: Display shifted on LG L246WP

If the problem is that the EDID is providing incorrect information (which is what it sounds like, and the WAR to supply a custom EDID supports this theory) then the correct fix is for LG to provide a correct EDID. I don't know if it's possible for LG to update the EDID in a display already shipped to an end user, so the workaround of using a custom EDID will have to do.
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