[CentOS] XORG and LCD Projector

Sun Sep 11 14:52:38 UTC 2011
Andrew 'Dewa' B. Osmond <dewa.nich at gmail.com>

@Christopher Hawker :
my laptop version is M54SR, old version of Axioo.

@Robert Heller :
VGA or DVI?
--> VGA

Which screen is blank? The notebook's or the LCD Projector or both?
--> LCD Projector

Is the LCD Projector displaying a message to the effect that an
unsupported sync rate or video mode in being used?
--> No. Nothing's happen. Just blank screen. I think it's becaused lcd
projector mode maybe doesn't same with xorg but I don't know how to
configure it.

On Sun, Sep 11, 2011 at 9:25 PM, Robert Heller <heller at deepsoft.com> wrote:

> At Sun, 11 Sep 2011 20:34:30 +0700 CentOS mailing list <centos at centos.org>
> wrote:
>
> >
> >
> >
> > dear guys,
> >
> > I have a problem between my CentOS 5.5 (on Axioo notebook) and LCD
> > Projector. When I connect my notebook to LCD Projector, it can detect my
> > notebook.
>
> VGA or DVI?
>
> > But when I press Fn + F7 to activate dual monitor between my notebook and
> > LCD Projector it goes to blank screen. FYI, the LCD Projector is NEC but
> I
> > don't know the series.
>
> Which screen is blank? The notebook's or the LCD Projector or both?
>
> > I've tried to change display using dual head monitor but it has no
> effects.
>
> There are two different things going on here.
>
> "dual head monitor" normally means that the two monitors display
> *different* stuff.  This *usually* implies that the *video card*
> specificly supports two independent monitors, usually by having two
> frame buffers and two video outputs.  This usually also implies *two*
> Device sections in xorg.conf, eg you (logically) have two video cards
> installed (even if they are both on the same physical 'card' or even same
> physical 'chip').
>
> *Most* laptops/notebooks DON'T have "dual head monitor" capable video
> cards.  What they have is a video output that goes to a logical "Y"
> connection: *one* frame buffer+video output circuit, going to two video
> connections, one being the internal LCD and the other being the VGA (or
> DVI with newer laptops/notebooks) connector.
>
> The Fn + F7 generally toggles between two or three states:
>
> Video goes to the internal screen.
> Video goes to the external screen.
> Video goes to both screens (*some* laptops/notebooks can't do this, esp.
> if the scan rates are incompatible).
>
> In all cases there is only one video 'Device'.  The Fn + F7's logic is
> like pluging in different monitors into the *one* video output
> connection on a desktop.
>
>
> > Do I need some driver??
>
> Probably not.  It might be that you need to have different things in
> your Screen section, partitularly in the Display SubSection.  It might
> be that the LCD Projector cannot handle the display mode(s) specificed.
> Is the LCD Projector displaying a message to the effect that an
> unsupported sync rate or video mode in being used?
>
> >
> > and this is my xorg configuration :
> > Section "Device"
> >         Identifier  "Videocard0"
> >         Driver      "openchrome"
> > EndSection
> >
> > Section "Screen"
> >         Identifier "Screen0"
> >         Device     "Videocard0"
> >         DefaultDepth     24
> >         SubSection "Display"
> >                 Viewport   0 0
> >                 Depth     24
> >                 Modes    "1280x800" "1024x768" "800x600" "640x480"
> >         EndSubSection
> > EndSection
> >
> > Hope you guys can help me. Thanks.
> >
> >
> > Andrew.
> >
> > MIME-Version: 1.0
> >
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> >
> >
>
> --
> Robert Heller             -- 978-544-6933 / heller at deepsoft.com
> Deepwoods Software        -- http://www.deepsoft.com/
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