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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.

Now, I've done dual head before with fglrx without any problem, but
this time, my monitors are of different resolution. So, I am forced to
stick with "radeon" and xinerama.

As of right now, my laptop's LCD is working fine, but my external
screen just displays a light-blue color. I can move my cursor onto it,
but when the cursor goes onto the screen, it's just a big,
multi-colored square. I can move the pointer to and from the second
screen without any problem. When I try to move windows, I cannot see
the window. I can see the big, multi-colored square pointer moving
around the screen, however. Moving the window back into the internal
LCD causes it to reappear.

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"
Option "AGPmode" "4"
Screen 1
Option "MonitorLayout" "CRT,TMDS"
Option "DDCMode" "true"
BusID "PCI:1:0:0"
EndSection

Section "Monitor"
Identifier "InternalLCD"
HorizSync 31.5 - 48.5
Option "DPMS"
VertRefresh 50-75
EndSection

Section "Monitor"
Identifier "ExternalCRT"
VendorName "ProView"
Option "DPMS"
HorizSync 60-61
VertRefresh 74-75
EndSection

Section "Screen"
Identifier "Screen 1"
Device "X3001"
Monitor "InternalLCD"
DefaultDepth 24
Subsection "Display"
... (lots removed here)
EndSubsection
EndSection

Section "Screen"
Identifier "Screen 2"
Device "X3002"
Monitor "ExternalCRT"
DefaultDepth 24

SubSection "Display"
... (lots removed here)
EndSubSection
EndSection

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?

Thanks in advance for any suggestions.

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

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

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

In comp.os.linux.setup colin353 <colin353@gmail.com>:
> Alright, I've solved the problem on my own...

Glad to hear!

> 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.

You didn't mentioned you had compiled your kernel on your own,
and modified those settings, the option should be set to "m" per
default in any distro kernel.

[ TOFU removed ]

--
Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
mail: echo zvpunry@urvzvat.qr | perl -pe 'y/a-z/n-za-m/'
#bofh excuse 236: Fanout dropping voltage too much, try cutting
some of those little traces