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Old 04-18-2011, 03:46 PM   #1
someshpr
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Screen not showing on laptop but showing on projector when connected


Hi,
When I try to connect a projector to my laptop (already running) and hit the fn+f7 (the designated button for switching screen), nothing happens. I see "no source found" on projector screen and my laptop screen works perfectly. Now if I restart the laptop with the projector connected, I see all the intial booting messages on the projector screen (not on my laptop), then the gnome login screen appears on both the projector screen and laptop (when the login screen appears on laptop it looks like it has lower resolution than my usual laptop resolution). But immediately after I log in, my laptop screen goes blank, and projector screen becomes the only active screen.

If I restart without the projector, again all normal operation on laptop screen is restored.

I feel like I am missing some very silly options. Any help is appreciated.

Here is the output of xrandr when the laptop is connected:
Code:
somesh@creativision:~$ xrandr 
Screen 0: minimum 320 x 200, current 1152 x 864, maximum 1600 x 1600
VGA connected 1152x864+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768       60.0 +   84.9     85.0     75.1     75.0     70.1     60.0  
   1600x1024      60.0  
   1400x1050      60.0     60.0  
   1280x1024      75.0     59.9     60.0  
   1440x900       60.2  
   1280x960       60.0  
   1280x800       60.0  
   1152x864       75.0* 
   1280x768       60.0  
   1152x768       54.8  
   832x624        74.6  
   800x600        84.9     72.2     75.0     60.3     56.2  
   640x480        84.6     75.0     72.8     72.8     75.0     66.7     60.0     59.9  
LVDS connected (normal left inverted right x axis y axis)
   1280x800       60.0 +   60.0     50.0  
   1280x768       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        59.9  
TMDS-1 disconnected (normal left inverted right x axis y axis)
My system is Debian Lenny and I am running Gnome.

TIA,
 
Old 04-18-2011, 04:09 PM   #2
Dazed_75
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A fairly typical result actually.

the fn+F7 you mentioned is probably valid under Windows but may well not be set up in your Debian. I know that is fixable, but I do not know how without searching myself. You may need to do this for attaching the external monitor/projector after Debian is running (see below).

When you boot with the projector connected, the boot process is able to detect most projectors and most distros assume you are using an external monitor to replace the built-in. So while it is coming up you see a mix of display locations but it ends up using the external and not the internal.

In either case, you might want to look for something about monitors (or similar) under the System/Preferences or Administration menu. I am not sure what it is called under Debian, but it exists in every Gnome implementation I am accustomed to. That should give you the ability to detect monitors, set resolutions (with limits), identify monitors (by displaying a big 1 or 2 on the monitors it recognizes), and to set up whether to use only one monitor, clone them, or use them as two monitors (left and right, top and bottom, or ...).
 
1 members found this post helpful.
Old 04-18-2011, 04:40 PM   #3
someshpr
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Quote:
Originally Posted by Dazed_75 View Post
A fairly typical result actually.
...
In either case, you might want to look for something about monitors (or similar) under the System/Preferences or Administration menu. I am not sure what it is called under Debian, but it exists in every Gnome implementation I am accustomed to. That should give you the ability to detect monitors, set resolutions (with limits), identify monitors (by displaying a big 1 or 2 on the monitors it recognizes), and to set up whether to use only one monitor, clone them, or use them as two monitors (left and right, top and bottom, or ...).
Thanks a lot Dazed_75. I couldn't find any such app. I am sure I had seen such app earlier in a CentOS machine. So I did a little search and found that I could do that using xrandr, but wasn't sure how. So finally I instaled grandr and was able to get both the displays. Another issue was that the refresh rate of the projector and the laptop was different. So now both of them has same resolution and refresh rate.

Somesh
 
Old 04-18-2011, 04:58 PM   #4
Dazed_75
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Great. And thanks for the reminder that xrandr can do that too. I had forgotten.
 
  


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