Dual Monitors Ubuntu Jaunty

Mike Hoy mhoy06 at gmail.com
Thu May 28 21:27:03 MST 2009 

xorg.conf:
Section "Monitor"
 22     Identifier  "Configured Monitor"
 23 EndSection
 24
 25 Section "Screen"
 26     Identifier  "Default Screen"
 27     Monitor     "Configured Monitor"
 28     Device      "Configured Video Device"
 29     SubSection "Display"
 30         Virtual 1024 1536
 31     EndSubSection
 32 EndSection
 33
 34 Section "Device"
 35     Identifier  "Configured Video Device"
 36 EndSection
 37

I wonder, can I just change the value of 'Virtual 1024 1536'? Also I
recognize the 1024 (1024x768) but what's the 1536?

And here's lspci -v
00:00.0 Host bridge: ATI Technologies Inc Radeon 9100 IGP Host Bridge (rev
02)
    Subsystem: ATI Technologies Inc Device 1234
    Flags: bus master, 66MHz, medium devsel, latency 64
    Memory at d2000000 (32-bit, prefetchable) [size=32M]
    Memory at d0000000 (32-bit, non-prefetchable) [size=4K]
    Capabilities: <access denied>
    Kernel driver in use: agpgart-ati
    Kernel modules: ati-agp

00:01.0 PCI bridge: ATI Technologies Inc Radeon 9100 IGP AGP Bridge
    Flags: bus master, 66MHz, medium devsel, latency 99
    Bus: primary=00, secondary=01, subordinate=01, sec-latency=68
    I/O behind bridge: 00009000-00009fff
    Memory behind bridge: d0100000-d01fffff
    Prefetchable memory behind bridge: e0000000-efffffff
    Kernel modules: shpchp



On Thu, May 28, 2009 at 11:10 PM, Craig White <craigwhite at azapple.com>wrote:

> Hi -
>
> On Thu, 2009-05-28 at 20:27 -0700, Joseph Sinclair wrote:
> > Most cards have a maximum resolution for all screens combined (for
> instance, an ATI 200M maxes out at 2048x1536) which is based on how fast it
> can push pixels across the (DVI/HDMI/RAMDAC) interface.
> > I would be surprised if you actually cannot exceed 1024x768 for a single
> screen, but getting multi-monitor support working well is a bit of a
> black-art still, and the combined max resolution of your card may be too
> small to handle the laptop screen and a large screen besides.
> >
> > If you can let us know what card you're working with, it's fairly easy to
> google the specs to find it's (official) limits.
> >
> > The thing you may have to do is use the appropriate configuration
> subsystem to add more resolution options to the system.  I've found xrandr
> in the latest Ubuntu and Fedora releases to be very poor at correctly
> configuring displays, even though the only purpose it has is to make that
> work better...
> >
> >
> > Mike Hoy wrote:
> > > I set up Juanty on my laptop and decided to hook up my 22" monitor
> > > (widescreen). It's nice to have a larger viewing area but the screen
> > > resolution for the 22" monitor is exactly the same as the laptop
> 1024x768.
> > > I'm not that well educated on screen resolutions and video
> cards/drivers so
> > > I have to ask: Is there a maximum screen resolution that a video card
> will
> > > support or can I force it to a different resolution for the 22"
> monitor?
> > >
> > > In windows the laptop maxes out at 1024x768 so that alone is telling me
> that
> > > the card cannot do any higher. Any help appreciated.
> ----
> I cannot comment on the current state of Ubuntu. I think that Fedora is
> shipping a newer version of xserver and xrandr (1.6.1 and 1.3
> respectively)
>
> I know that my Acer Aspire One (intel 945GME video) can easily do
> 2048x2048 and my understanding is that anything above 2304x2304 will
> suffer a speed penalty (Intel limitation). I would expect that any
> laptop made in the last 3 years will easily reach this resolution.
>
> Fedora 10 (and 11 which is actually still in preview and will be
> released in another week barring any more setbacks) by default does not
> actually create an xorg.conf file at all and builds it on the fly at
> startup. There are many reasons for this including hardware changes and
> userland control over the display options which both GNOME and KDE have
> some very nice display tools which allow you to clone or extend multiple
> displays, etc.
>
> Now I know that Joseph is far more knowledgeable than I am about X/video
> displays, etc. and this concept clearly doesn't work for all hardware
> types. If you go off the reservation (i.e. use proprietary nVidia or ATi
> blob drivers), you have no choice but to create xorg.conf files. I did
> that on my Acer netbook because I desperately wanted a 'virtual' screen
> larger than the actual 1024x600 and it works great.
>
> I know on a Fedora system, if you needed to coerce a different
> resolution, you could go to 'Administration=>Display' and choose it to
> see if you can make it happen. Now 22" display doesn't really say enough
> because some of them are 16x9 (wide) and might give you a resolution of
> say 1600x1050 but if it's a 4x3 (normal), you should easily be able to
> get 1600x1200 on the external display and then it would be your choice
> whether to 'clone' or 'extend' the laptop display. On KDE 4 Fedora 10 or
> Fedora 11, they also have a Krandr plasmoid that gives you immediate
> access to the display properties as a user but of course, the only
> options are those that are available either as supplied by the xorg.conf
> file you generate or if none is available, whatever the settings were
> created on the fly.
>
> There is also a log of the X server startup...on Fedora, this would
> be /var/log/Xorg.0.log and it would report all of the various possible
> resolutions and the relative success output if desired.
>
> The video card information can be found by running the command...
>
> sudo /sbin/lspci -v
>
> The display information can be found in the Xorg.0.log as described
> above but you might be able to change that by tweaking the display
> configuration by the Ubuntu equivalent to Fedora's
> 'system-config-display --reconfig' command
>
> Craig
>
>
> --
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-- 
Mike Hoy
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