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

Newegg Daily Deals

Reply
 
Thread Tools
Old 04-30-09, 10:42 PM   #1
marco1475
Registered User
 
marco1475's Avatar
 
Join Date: Apr 2009
Location: Hunt Valley, MD, USA
Posts: 2
Send a message via ICQ to marco1475 Send a message via AIM to marco1475 Send a message via MSN to marco1475 Send a message via Skype™ to marco1475
Default Fuzzy/Blurry Image via HDMI (faulty EDID)

Hi,

Let me preface this by saying that I have Googled and read a lot about this issue and I think I know what is wrong, but I do not know how to fix it. I bought a netbook with a nVidia GeForce 9300M GS and connected it to my Viewsonic VX2435wm monitor via HDMI. The netbook originally came with Vista Business and even then did I notice the image being fuzzy, but I thought then it was just missing ClearType or something. I then installed Gentoo Linux on the machine running the nvidia-drivers-180.51 with xorg-server-1.5.3.

Upon connecting my monitor and setting up my xorg.conf I can see that the image is still blurry and it is especially visible with red text on white background, where the text has a "halo." My Google research has shown me that this is probably an EDID problem (as described here), i.e. that my monitor is identifying itself as an HDTV to the driver and the driver, in an attempt to make the image better, screws it up.

I proceeded to verify this assumption by connecting my monitor (which btw. works flawlessly with my older Dell notebook with an nVidia card running XP) via the analog port and true enough, the image was crystal clear. Furthermore the information my monitor's on-screen menu provides in case of the XP- and the analog-connection is:

Code:
H.Frequency 74KHz
V.Frequency 60Hz
Resolution 1920x1200
PixelClock 154MHz
while for the digital, HDMI connection is:

Code:
H.Frequency 74KHz
V.Frequency 59Hz
Resolution 1200p
PixelClock 154MHz
So I searched the internet for a solution and found several ranging from disabling the extensions in the EDID, over copying and using the EDID from the analog connection to creating my own modeline and disabling EDID all together. I tried them all and none helped.

The problem seems to be that the nvidia driver always ignores the custom EDID I pass to it. The custom modeline approach failed because I was unable to create a valid one for my PixelClock parameter (and this worked only after I disabled everything described in this forum post, simple Option "UseEDID" "false" did not do the trick.) Similarly my Option "CustomEDID" "DFP-1:/path/to/edid" does not work!

Attached you will find all the information I have:
  • the analog and digital xorg.conf's,
  • the viewsonic.edid which I try to use as the CustomEDID parameter (and which is really the EDID gotten through the analog connection),
  • the nvidia-settings EDID dumps from both the analog (edid_analog.bin) and digital (edid_digital.bin) connections, as well as
  • analog and digital Xorg.0.logs, and
  • nvidia-bug-report.logs.
(All were created with -logverbose 6.)

Both logs show pretty clearly that the two EDIDs are different (lines 278-285 in analog, 444-459 in digital) - the digital one is larger and I confirmed this with a hex viewer - and that the digital connection uses the large, digital EDID it gets from the monitor rather than the analog EDID saved on drive (viewsonic.edid) and provided through the CustomEDID option. Other than acknowledging that the option was set (line 2165 in digital) I cannot see any sign of it being applied anywhere in the logs.

So, long story short - why is the custom EDID not being read for the digital connection? Can I force it somehow? I would really love to have a digital connection from my netbook to my monitor ...

Thanks,
Attached Files
File Type: gz nvidia-bug-report.log.analog.gz (48.8 KB, 116 views)
File Type: gz nvidia-bug-report.log.digital.gz (54.1 KB, 95 views)
File Type: zip confs-logs-edids.zip (42.8 KB, 129 views)
__________________
marco1475

"If you can't make it good, make it big. If you can't make it big, make it shiny." (nVidia shader presentation)

Last edited by marco1475; 04-30-09 at 10:45 PM. Reason: spelling mistakes
marco1475 is offline   Reply With Quote
Old 05-01-09, 07:35 PM   #2
marco1475
Registered User
 
marco1475's Avatar
 
Join Date: Apr 2009
Location: Hunt Valley, MD, USA
Posts: 2
Send a message via ICQ to marco1475 Send a message via AIM to marco1475 Send a message via MSN to marco1475 Send a message via Skype™ to marco1475
Default Re: Fuzzy/Blurry Image via HDMI (faulty EDID)

So apparently all I need to do is post to a forum and within 24h I find the solution by myself

My problem was that the "CustomEDID" option needs to be placed in the first Device section (i.e. the Device-Device section, not the Device-Card section or the Screen section).

So my old Device section

Code:
Section "Device"
	Identifier	"Device0"
	Driver		"nvidia"
	VendorName	"NVIDIA Corporation"
	BoardName	"GeForce 9300M GS"
	BusID		"PCI:3:0:0"
	Screen		0
EndSection
had to be changed to

Code:
Section "Device"
	Identifier	"Device0"
	Driver		"nvidia"
	VendorName	"NVIDIA Corporation"
	BoardName	"GeForce 9300M GS"
	BusID		"PCI:3:0:0"
	Screen		0
	Option		"CustomEDID"	"DFP-1:/etc/X11/viewsonic.edid"
EndSection
That is the only place where the "CustomEDID" option can be to be recognized by the X system. Now even the log says it is loading the EDID from disk and my blurriness/fuzziness is gone! (I have attached my final, working xorg.conf.)

Thanks,
Attached Files
File Type: txt xorg.conf.txt (2.7 KB, 224 views)
__________________
marco1475

"If you can't make it good, make it big. If you can't make it big, make it shiny." (nVidia shader presentation)
marco1475 is offline   Reply With Quote
Old 05-01-09, 07:56 PM   #3
brucecadieux
Registered User
 
Join Date: Dec 2008
Posts: 78
Default Re: Fuzzy/Blurry Image via HDMI (faulty EDID)

As far as I know 1200p is not a valid resolution.

1080p or 1080i are valid HD resolutions.
brucecadieux is offline   Reply With Quote
Old 05-01-09, 08:00 PM   #4
brucecadieux
Registered User
 
Join Date: Dec 2008
Posts: 78
Default Re: Fuzzy/Blurry Image via HDMI (faulty EDID)

As far as I know 1200p is not a valid resolution.

1080p or 1080i are valid HD resolutions.
brucecadieux 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
IOGEAR 3D Complete+ 4-Port HDMI Switcher with 2D/3D Video Processor News Archived News Items 0 06-28-12 05:40 PM
HDMI audio ELD weirdness RockHound NVIDIA Linux 0 05-11-12 03:45 AM

All times are GMT -5. The time now is 09:25 AM.


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