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Old 08-11-2011, 12:09 AM   #1
psionl0
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Nvidia screen distortion


I have just installed slackware 13.37 64-bit on an e-machines EL1358.

I have managed to get X working but there is a sort of distortion that is difficult to describe. There are vertical sections of the screen where the image is slightly elongated. It is only slight but it is enough to make text within those sections appear a little fuzzy. The overall effect is to make the entire screen overshoot to the right a little (on a maximized window, the close window button is half obscured).

The effect is the same whether I use TWM or Fluxbox as a WM.

I have already disabled noveau and installed nvidia-kernels and nvidia-drivers from slackbuilds (the only I could get X to work at all). However, I don't know of any tweaks that could only be applied to part of the screen.

There may be some timing conflict that causes this effect but I don't know what or what to do about it.

Any ideas?
 
Old 08-11-2011, 12:13 AM   #2
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Run "nvidia-settings" and see if setting the Screen resolution and refresh rate utility helps. Usually nvidia's tools can detect the EDID profile of the monitor and get the default resolution and the supported refresh rates.

Curious but what kind of monitor are you using? LCD, CRT, HDTV, etc?
 
Old 08-11-2011, 12:56 AM   #3
psionl0
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This is the information I get from nvidia-settings:
Code:
Dimensions: 1368x768 pixels (414x232 millimeters)
Depth: 24
GPUs: GeForce 6150SE nForce 430 (GPU 0)
Displays: EMA E192HQV
Dimensions: 1368x768 pixels (414x232 millimeters)
Depth: 24
The monitor is an LCD monitor as you would expect from a current PC.
So far, none of the sliders or other controls on nvidia-settings has had the slightest effect on the distortion I am experiencing.
 
Old 08-11-2011, 02:25 PM   #4
H_TeXMeX_H
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Try overscan compensation in the DFP menu.
 
Old 08-11-2011, 08:45 PM   #5
psionl0
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I can't find the DFP menu in nvidia-settings. Can you explain further?
 
Old 08-11-2011, 09:35 PM   #6
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It's the monitor settings tab/page.
 
Old 08-11-2011, 11:48 PM   #7
psionl0
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This is what my nvidia-settings ap looks like. It doesn't appear to have any provision for DFP or monitor settings.
nvidia.png
 
Old 08-12-2011, 12:14 AM   #8
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Question #1. Is your monitor a CRT monitor or an LCD monitor? I know it says it's a CRT type but 1378x768 is a 15.6" widescreen LCD (or should be).

Question #2. Can you increase your refresh rate past 60Hz?

Question #3. Can you show the same image you posted except with the Advanced settings shown?
 
Old 08-12-2011, 03:38 AM   #9
psionl0
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Answer #1. It is an 18.5" LCD monitor. (I only just bought the computer).

Answer #2. The only options for the vertical refresh rate are "Auto" or "60 Hz".

Answer #3. screenshot.png
 
Old 08-12-2011, 04:00 AM   #10
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Have you checked that GPU scaling isn't enabled?
When I had Slack on my nvidia computer I had very blurry screen. GPU scaling caused that blurryness.

If I remember correctly that option should be at the bottom, under GPU 0 section.
 
Old 08-12-2011, 04:20 AM   #11
psionl0
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Alas, GPU scaling is also an option that seems to be missing from nvidia-settings.
 
Old 08-12-2011, 11:53 AM   #12
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That is very strange, because it seems to be identifying an LCD monitor as a CRT monitor.

Overscan compensation should be in the CRT tab, just search for it.

If it doesn't work maybe try disabling EDID:
Code:
Option "UseEDID" "FALSE"
http://us.download.nvidia.com/XFree8...igoptions.html
 
Old 08-12-2011, 10:29 PM   #13
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I think I had this same problem (black bar on the left, close buttons shoved off the right) with the nv driver, but never with nvidia's or the nouveau driver. Try running xvidtune and nudge the screen to the left. I never figured out what caused it, so there might be a better solution. Maybe the distortion is from the image not aligning to the LCD pixels?
 
Old 08-12-2011, 11:03 PM   #14
psionl0
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Quote:
Originally Posted by H_TeXMeX_H View Post
If it doesn't work maybe try disabling EDID:
That ALMOST worked! The distortion disappeared and maximized windows fitted entirely within the screen.

The problem? The 1368x768 resolution was no longer available and the system defaulted to 1024x768. Other resolutions were available but they were all for the more old fashioned 4:3 aspect ratio.

@elyk any attempt to change settings via xvidtune left the same message:
Quote:
Sorry: You have requested a mode-line that is not possible, or not supported by your hardware configuration.
 
Old 08-13-2011, 04:52 AM   #15
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I'm thinking the window manager is trying to force a virtual desktop and that's why your monitor is not setting correctly along with the EDID having issues.

Try checking the configuration script for your window manager and see if there are any settings for a virtual desktop and disable them.

I also want to ask, are you running a display manager like GDM, XDM, or KDM? If you are, disable using a display manager in xinitc and use the default requiring startx to be ran.

There's also a chance, though rare, you could have simply a bad monitor. If all else fails, borrow a monitor for testing somehow, and see if it happens on a different monitor.

But yes the EDID should not be reporting it as a CRT by any regards.
 
  


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