analog lcd monitor not working after installing a digital lcd monitor

nishlq · 05-07-2006, 10:14 AM

Hi,
I have a Samsung syncmaster 710N 17" analog lcd monitor. This was working fine with FC4. Then I got a new Dell 19" digital lcd monitor from my office. I installed FC5 on my machine. Everything was working fine. Now I have to revert back to the old samsung monitor. So I changed xorg.conf appropriately. This didnot work. The monitor displayed the following warning.
"Not Optimum Mode","Recommended Mode 1280 x 1024 60Hz"
The details about this can be found at
downloadcenter.samsung.com/content/EM/200509/20050905224727156/EN/6_sub.htm
Something to do with operating frequency.

I thought it would be better if the monitor is detected at the installation time itself so I refromated the machine and installed FC5 again. It was able to detect my monitor and was also able to set the frequency range correctly but I still faced the same issue.

The x logs shows me a warning that no compatible modes were found so resorting to the default.

But actually none is shown.

I know where to set the frequency range in xorg.conf.
but where do you set that the oprating frequency must be 60. In some links I have seen something like 1280x1024-60 being specified in the modes but this didnot work too.

Does this have anything to do with the digital lcd that i once used? Do I need to configure dual monitor kind of stuff though there is actually just one monitor?

I have also tried updating to the latest kernel and the latest nvidia drivers but that didn't help.
I have an ASUS Geforce 6200 video card.

thanks and regards,
Nishant

nishlq · 05-07-2006, 10:32 AM

Or is it that the OS or the video card still assumes that the digital output is the one which is being used. I get the following error in x log.

Unable to get display device CRT-0's EDID; cannot compute DPI from EDID.

thanks and regards,
Nishant

Brian1 · 05-07-2006, 12:16 PM

Here is my /etc/X11/xorg.conf for a Samsung 19" Syncmaster 914v

Code:

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "Monitor Vendor"
	ModelName    "LCD Panel 1280x1024"
	HorizSync    31.5 - 67.0
	VertRefresh  50.0 - 75.0
	Option	    "dpms"
EndSection

Section "Device"
	Identifier  "Videocard0"
	Driver      "radeon"
	VendorName  "Videocard vendor"
	BoardName   "ATI Radeon Mobility M9"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Videocard0"
	Monitor    "Monitor0"
	DefaultDepth     24
	SubSection "Display"
		Viewport   0 0
		Depth     16
		Modes    "800x600" "640x480"
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     24
		Modes    "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
	EndSubSection

See if that works. Make a backup of existing xorg.conf file

nishlq · 05-10-2006, 11:24 AM

thanks brian,

but it is still not working. The the machine was able to detect correctly the required frequencies etc and xorg.conf was configured automatically. When I start the XServer it fails and I get the message "Not Optimum Mode","Recommended Mode 1280 x 1024 60Hz".

I don't know what to check.

thanks,
Nishant

Brian1 · 05-13-2006, 08:23 AM

No other ideas on that one Nishant.

Brian1

nishlq · 05-14-2006, 08:59 AM

thanks anyways brian.

I have a video card that has multiple output. I am not so technical guy so for me they are white and blue output (I guess digital and analog output respectively). Is there any way to configure which one is being used apart from connecting to that output? scanning PCI I found the video adapter was on 1.0.0. How would I know this is the blue one (the analog one)?

The monitor used to work earlier till I used the white output port. Now I cannot move back to the blue one.

thanks,
Nishant

Mahaus · 08-18-2006, 02:18 PM

Hi.

Please refer to this thread:
http://www.linuxquestions.org/questi...t=optimum+mode

Couldn't post here before making 3 posts...