Alright, I've solved the problem on my own...
Out of curiosity, I was checking my kernel ".config" file and came
across a giveaway option:
CONFIG_FB_RADEON=n
At any rate, enabling the option allowed everything to work. Actually,
I'm pretty sure it's enabled by default. Don't know how that
happened... :P
But anyway, the moral of the story is, if anyone has the problem of a
totally unusable right monitor that displays only a square cursor,
check your kernel .config file for a possible mistake.
Thanks for the help anyway.
colin353 wrote:
> First, thanks for the reply.
>
> > Does it work with the same resolution at all?
>
> No, it doesn't. Well, my left monitor acts as if it is in dual head
> mode (I can drag windows past my right window border) but my right
> monitor is just blue with a big square cursor.
>
> >It might be you have a general problem with your dual-head setup?
>
> Yes, I do have a general problem with my dual-head setup. That's why
> I'm trying to fix it with the same resolutions first. Once I get my
> secondary monitor working at 1024x768, I'll see what I can do to change
> the resolution from there.
>
> > Tried the following already?
> > Option "MergedFB" "1"
>
> Well, I sort of tried it, but didn't put too much effort into making it
> work. For some reason, I had thought that MergedFB would not allow
> multiple different resolutions.
>
> Fortunately, I am (apparently) wrong:
>
> http://ozlabs.org/~jk/docs/mergefb/
>
> I'll follow the instructions on the site and see what happens.
>
> Thanks again,
>
> Colin
>
> Michael Heiming wrote:
> > In comp.os.linux.setup colin353 <colin353@gmail.com>:
> > > Hmm...
> >
> > > I'm trying to get a xinerama dual-head setup working on my Dell
> > > Latitude D610 and an external LCD with the "radeon" driver.
> >
> > [..]
> >
> > > Relevant parts of my /etc/X11/xorg.conf include:
> >
> > > Section "Device"
> > > Identifier "X3001"
> > > Driver "radeon"
> > > Option "AGPmode" "4"
> > > Option "MonitorLayout" "CRT,TMDS"
> > > Screen 0
> > > Option "DDCMode" "true"
> > > BusID "PCI:1:0:0"
> > > EndSection
> >
> > > Section "Device"
> > > Identifier "X3002"
> > > Driver "radeon"
> >
> > Tried the following already?
> >
> > Option "MergedFB" "1"
> >
> > [..]
> >
> > > This may be totally unrelated, but I have a warning in my Xorg.0.log:
> >
> > > (WW) RADEON(0): Failed to detect secondary monitor, MergedFB/Clone mode
> > > disabled
> >
> > > Oddly, Radeon makes flawless DDC communication with the monitor to
> > > determine resolutions, refresh rates, etc. What's the deal with that?
> >
> > > Has anyone had this kind of problem before? If not, is there an
> > > alternate solution to Xinerama + radeon that will support multiple
> > > resolutions on dual head?
> >
> > Does it work with the same resolution at all? It might be you
> > have a general problem with your dual-head setup?
> >
> > Though I don't used different resolution, as my dual-head
> > monitors are exactly the same and TFT, so they just run their
> > native resolution, from 'xdpyinfo'
> >
> > dimensions: 2560x1024 pixels (764x302 millimeters)
> > resolution: 85x86 dots per inch
> >
> > Both cards use the radeon driver, sadly 3D doesn't work with
> > Xinerama on Xfree86. I can however switch the resolution on each
> > of them independently through all configured modes with no
> > problems. I'd be surprised if this shouldn't work with xorg.
> >
> > --
> > Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
> > mail: echo zvpunry@urvzvat.qr | perl -pe 'y/a-z/n-za-m/'
> > #bofh excuse 45: virus attack, luser responsible