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Old 07-03-2009, 01:52 AM   #1
Registered: Sep 2007
Location: Ohio
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Thumbs down viewsonic ve155b - out of range - debian cant boot monitor

I don't understand why my acer 22" flat screen monitor works fine with debian, but then a viewsonic ve155b will not boot.

When I run the viewsonic on it, i see the motherboard starting, but once the OS is supposed to take over, it goes to 'out of range'

other monitors work fine on it, and the viewsonic monitor works fine with my tinyXP computer.

Very frustrating. I'm guessing drivers?

Where to go from here?

Thanks in advance, cuz this is very frustrating, cuz everytime I need to use my linux box i have to unplug a monitor and plug it in to it.
Old 07-04-2009, 09:26 AM   #2
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Hello mtlhd

My guess would be that your system does not detect the change of display so uses the settings configured for your Acer monitor. Hence the Viewsonic receives signals that suit the Acer but which it can't process -- probably the screen size. The Viewsonic has a maximum resolution of 1024x768.

As a test and workaround, when you want to swap from Acer to Viewsonic, you could use System->Preferences->"Screen Resolution" and change the settings to suit the Viewsonic. It may be possible to do this more conveniently by Alt+Ctl+<keypad + or keypad ->.

It may be that X can auto-detect the screen and so automatically change settings. I guess it would need an entry in /etc/X11/xorg.conf for the Viewsonic to do that. Presumably you installed debain using the Acer and an xorg.conf entry for the Acer was generated during installation.

In case it helps, here's an xorg.conf entry for a similar Viewsonic
Section "Monitor" 
        Identifier      "Configured Monitor" 
        VendorName      "ViewSonic" 
        ModelName       "VA503b (VS11357)" 
        HorizSync       30-82 
        VertRefresh     50-85 
        DisplaySize     270     203     # In mm.  Is 1024x768 @ 96dpi 
You can probably find examples of multiple monitor xorg.conf files on the 'net.


Old 07-04-2009, 12:32 PM   #3
Registered: Sep 2007
Location: Ohio
Distribution: Raspbian, Debian, CentOS, Ubuntu
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First off, Charles, thanks for your reply.

After your advice I started googling xorg cof files configs for my viewsonic.

after hunting a little while, I found out how to have the computer auto detect from command line using putty on my other comp.

After reboot the viewsonic monitor is showing my GUI!
Hellz yeah!

For those of you with the same problem using a debian or Ubuntu, this is
what I did:

using putty.exe from another computer on your network,

(You have to be root user)

rootuser@linuxmahine:~#dpkg-reconfigure xserver-xorg
It will walk you through graphics set up and auto detect your monitor.

Hope that helps anyone else in the same situation.




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