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Old 07-09-05, 03:00 PM   #1
saqer
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Default 2005fpw: Thin wavy lines on select intensities of blue backgrounds

My monitor developed these lines lately. I can not really determine what could have trigerred this behaviour. The monitor is connected through dvi-d cable to 6600gt card.

The problem appears on both my windows and linux operating systems.

I found out about this problem when I noticed wavy thin lines on certain background colors but not others. To better understand the problem I configured my desktop background with different solid colors. I found that only blue subpixels show these wavy lines and only for certain intensities and not all blue intensities.

for example: each color (red, green,blue) has 256 degrees of intensity. I kept both green and red at zeros and varied the blue from zero to 255. At, say, 42, I will see thin lines moving accross the screen from top to down. The lines disappear at intensity, say, 45, then come back at intensity 52 and so on.

This does not happen when I do the same for green or red. But can happen for different combination of the three colors as will. But from the single color test I presume that lines are always from the blue supixels.

I performed these tests for elimination purpose:

1- I switched between the 2 dvi cables I have ( one comes with the monitor)
2- I reinstalled the drivers on both linux and windows.
3- On windows and linux I tried different standard modelines and timing settings and also tried different resolutions. (nvidia control panel in windows has this option to choose from different timing standards)
4- My card has dual dvi. I moved the dvi cable to the other port.
5- I also reseted the screen.
6- I disconnected the power cables and reconnected them. (I did not try other power outlet though! will this matter?)
7- I disconnected the printer which is attached to same power source as the computer and screen.

I will do these test during the weekend:
1- I will take the monitor to my friends house connect it to his computer to eliminate the possibilty of graphic card failure.
2- Will connect his dell 1905fp on my computer to retest the card on other monitor to verify card failiure.

until then, I thought I could post this to see any suggestions and if there are any setting I could adjust to resolve the problem.

FC4 x86_64
winXP 64 beta edition
Attached Files
File Type: txt Xorg.0.log.txt (35.9 KB, 176 views)
File Type: txt xorg.conf.txt (3.3 KB, 258 views)
File Type: txt glxinfo.txt (9.9 KB, 188 views)
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CPU: dual core AMD64 x2 4800+
motherboard: tyan k8e s2865
RAM: Corsair xms 4GB 3200C2 (400)
Video Card: EVGA GeForce 6600GT 128MB
Monitor: 20 inch wide screen dell 2005FPW

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CPU: dual xeon 2.8GH 533 FSB
motherboard: SuperMicro X5DAL
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Video Card: ASUS GeForce4 MX 440 AGP 8x (rev a2)
Monitor: Dual Display ViewSonic VA912b
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Old 07-11-05, 01:06 PM   #2
etymxris
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Default Re: 2005fpw: Thin wavy lines on select intensities of blue backgrounds

I get weird shimmering curvy lines too. Running Linux with a PCX6800GT. My monitor did not have these problems with a previous computer and video card, so I think it's the video card. The effect comes and goes (not here now) and hasn't bothered me enough to do anything about.
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Old 07-11-05, 02:15 PM   #3
saqer
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Default Re: 2005fpw: Thin wavy lines on select intensities of blue backgrounds

from Dell's website, This monitor has 146.25 MHz pixel clock for analog signal and 119 MHz for digital.

On windows, when I use the 146.25 MHz for the digital, the problem goes away! But this is not the case on windows. all modelines produce such lines.

In xtiming.sf.net it asks for the horizontal/vertical sync Time (in microseconds) what are these? How can I know their values exactly for my monitor?
__________________
DeskTop 1:
CPU: dual core AMD64 x2 4800+
motherboard: tyan k8e s2865
RAM: Corsair xms 4GB 3200C2 (400)
Video Card: EVGA GeForce 6600GT 128MB
Monitor: 20 inch wide screen dell 2005FPW

DeskTop 2:
CPU: dual xeon 2.8GH 533 FSB
motherboard: SuperMicro X5DAL
RAM: 2 GB
Video Card: ASUS GeForce4 MX 440 AGP 8x (rev a2)
Monitor: Dual Display ViewSonic VA912b
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Old 07-28-05, 05:11 PM   #4
netllama
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Default Re: 2005fpw: Thin wavy lines on select intensities of blue backgrounds

If you start X with this command:
startx -- -logverbose 5

then look at your X log for the EDID section for your monitor, you'll see the timing info you're searching for. Although the info in the log at that point should be sufficient to generate a modeline even without going to xtiming.sf.net.
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Old 08-16-05, 01:15 AM   #5
nnsg
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Default Re: 2005fpw: Thin wavy lines on select intensities of blue backgrounds

Quote:
Originally Posted by saqer
from Dell's website, This monitor has 146.25 MHz pixel clock for analog signal and 119 MHz for digital.

On windows, when I use the 146.25 MHz for the digital, the problem goes away! But this is not the case on windows. all modelines produce such lines.

In xtiming.sf.net it asks for the horizontal/vertical sync Time (in microseconds) what are these? How can I know their values exactly for my monitor?
On Linux, try add the following to your Nvidia driver section in xorg.conf:

Option "ExactModeTimingsDVI" "True"
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Old 08-19-05, 12:53 PM   #6
saqer
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Default Re: 2005fpw: Thin wavy lines on select intensities of blue backgrounds

The problem is gone by its self and never back for weeks now. I can tell the reason was that I have been using the analog (while I am using the digital connection) mode for long enough (months) untill the monitor started to missup. The even when I search to find out the right timings for the digital connections, the monitor needed weeks to get back to normal. Maybe something else is going on, but who cares as long as the monitor is working again.

For the record, here are the correct timings of the monitor:
Modeline "digital:1680x1050@60" 119.0 1680 1728 1760 1840 1050 1053 1059 1080 -hsync +vsync

Modeline "analog:1680x1050@60" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync
use the digital when the monitor is connected via DVI cable and use the analong modeline when connected via VGA cable. GTF calculator and xtinming do not report the right mode.
__________________
DeskTop 1:
CPU: dual core AMD64 x2 4800+
motherboard: tyan k8e s2865
RAM: Corsair xms 4GB 3200C2 (400)
Video Card: EVGA GeForce 6600GT 128MB
Monitor: 20 inch wide screen dell 2005FPW

DeskTop 2:
CPU: dual xeon 2.8GH 533 FSB
motherboard: SuperMicro X5DAL
RAM: 2 GB
Video Card: ASUS GeForce4 MX 440 AGP 8x (rev a2)
Monitor: Dual Display ViewSonic VA912b
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Old 08-31-05, 04:40 AM   #7
ihayhurst
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Default Re: 2005fpw: Thin wavy lines on select intensities of blue backgrounds

Magic , the digital modeline for the 2005fpw did it for me
Quote:
Modeline "digital:1680x1050@60" 119.0 1680 1728 1760 1840 1050 1053 1059 1080 -hsync +vsync
1.0-7174 worked at 1680 x1050 but later drivers dropped me back to 1400 x something with the wrong aspect ration.... I thought noEDID's was the next step
Many Thanks to Sager
Cheers Ian

Last edited by ihayhurst; 08-31-05 at 04:41 AM. Reason: spelling
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Old 09-01-05, 08:06 PM   #8
saqer
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Default Re: 2005fpw: Thin wavy lines on select intensities of blue backgrounds

Quote:
Originally Posted by nnsg
On Linux, try add the following to your Nvidia driver section in xorg.conf:

Option "ExactModeTimingsDVI" "True"
Well, sadly, the lines came out again. I do not think this has to do with anything with the drivers or the operating system. When they appear, they appear even at boot time when there is a blue text or background. I can see these even when I enter bios. They are really annoying

I suspect that the monitor has some defect. Not sure what other reason this could be.
__________________
DeskTop 1:
CPU: dual core AMD64 x2 4800+
motherboard: tyan k8e s2865
RAM: Corsair xms 4GB 3200C2 (400)
Video Card: EVGA GeForce 6600GT 128MB
Monitor: 20 inch wide screen dell 2005FPW

DeskTop 2:
CPU: dual xeon 2.8GH 533 FSB
motherboard: SuperMicro X5DAL
RAM: 2 GB
Video Card: ASUS GeForce4 MX 440 AGP 8x (rev a2)
Monitor: Dual Display ViewSonic VA912b
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