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Old 08-29-2007, 05:44 PM   #1
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Registered: Aug 2007
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Question Dual display on older LCD Projector and notebook screen

Dear all,

I am a lecturer at University and currently using Kubuntu 7.04. I added some configuration on my xorg.conf in order to get dual display on my notebook and LCD projector. Here some lines were added:

Section "Device"
identifier "Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller"
boardname "Intel 945"
busid "PCI:0:2:0"
driver "i810"
screen 0
vendorname "Intel"
Option "MonitorLayout" "NONE,LFP+CRT"
Option "DevicePresence" "true"
Option "CheckLid" "false"

Section "Monitor"
identifier "Generic Monitor"
vendorname "Generic"
modelname "1024x768 @ 60 Hz"
HorizSync 31.5-48.5
VertRefresh 50-70
modeline "640x480@60" 25.2 640 656 752 800 480 490 492 525 -vsync -hsync
modeline "800x600@56" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
modeline "800x600@60" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
modeline "1024x768@60" 65.0 1024 1048 1184 1344 768 771 777 806 -vsync -hsync
gamma 1.0

Section "Screen"
Identifier "Default Screen"
Device "Intel Corporation Mobile 945GM/GMS/940GML Express Integrated Graphics Controller"
Monitor "Generic Monitor"
DefaultDepth 24
SubSection "Display"
depth 24
virtual 1024 768
modes "1024x768@60" "800x600@60" "800x600@56" "640x480@60"

For some new LCD Projectors it works well, but for older ones I got message "unsupported signal" or something like that. Or sometime it shows but flickering.
It seems that the projector doesn't catch-up the frequency. I also got a message said that
"Please adjust to 1024x768 49Hz". Currently I use "1024x768 60Hz".
How can I add 49 Hz on xorg.conf?

Thank you
Old 09-07-2007, 07:15 AM   #2
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Registered: Dec 2006
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In the monitor section as the first or second modeline:
Modeline "1024x768@49" 50.63 1024 1056 1248 1280 768 784 790 807

and in the screen section add as the first or second mode:

The above modeline was generated using the Xfree86 Modeline Generator located here:

It says 'use at your own risk' but it's doubtful there would be any harm done if an older projector didn't like it. It did after all ask for the 49hz rate.
You will also need to change the VertRefresh range for the device from '50-70' to '49-70' or the server will reject it.

The X server may or may not actually select this mode automatically; that would depend on how 'intelligent' the LCD projector is, and whether it conveys to the X server that it would like to use this resolution/rate.
You may need to remove/comment out the other modelines if it does not get selected automatically.

I don't personally use modelines, so I can't give much advice further to this.
However, to do it the 'other' way, simply use something more like:

In the monitor section:
VertRefresh 49.0

..and in the screen section, use only:

modes "1024x768"

Best of success!

PS - though it could be a slight pain, you *may* find that you WILL need to comment out modes which you do not want used, if the desired mode does not get chosen. Another option would be to have multiple xorg.conf files, depending on what particular model of projector is being used at the time.
It's a small nuisance having to edit/rename xorg.confs and restart the server when changing projectors, but might be a necessary evil. I don't know another way to do it easily.

Last edited by GrapefruiTgirl; 09-07-2007 at 07:27 AM. Reason: 1 typo, added clarity.
Old 08-24-2011, 09:17 AM   #3
LQ Newbie
Registered: Aug 2011
Posts: 1

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Cool Always keep shining!

Shining is specialized on LCD advertising players, with ten different classical designs including all standard sizes from 7inch to 55inch for your choosing. Moreover, Shining is always willing to be your "production base", offerring support on various requirements for all kinds of projects, whatever in software or hardware. Our aim is to make your design idea become reality.

We are shining display!



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