MergedFB not working on radeon X700

Ricardo Ribalda Delgado ricardo.ribalda at
Wed Apr 25 14:22:54 PDT 2007

Thank you very much for your help

  It is already connected through a direct dvi cable. Tomorrow morning
as soon as I get to my office I will remove dri and radeonfb from my
kernel and I will try again.
    I have played today with the MonitorLayout parameter and the only
"progress", that I could get was having the dvi black and the vga on
using "CRT,NONE" or "NONE,CRT". This was the only result different for

     If I do a lspci I get a "strange device" 1:0:1

01:00.0 VGA compatible controller: ATI Technologies Inc RV410 [Radeon X700]
01:00.1 Display controller: ATI Technologies Inc Unknown device 5e6f

  Thanks again

On 4/25/07, Hans-Jürgen Koch <hjk at> wrote:
> Am Mittwoch 25 April 2007 22:41 schrieb Ricardo Ribalda Delgado:
> > Hi all
> >
> >   I'm trying to have dual head support with a radeon X700 using the
> > open source driver.  With Xinerama works perfectly, but when I try to
> > make it work using MergedFB I get exactly the same image on both
> > monitors (One connected to dvi and the other to vga). I have readed
> > the man, I have tryied many options, googled and.. I don't know what
> > else to do :(.
> >
> Well, your log says that mergedfb is actually not enabled:
> (EE) RADEON(0): No valid mode found for CRTC2, disabling MergedFB
> I had similar effects with my X300. My problem was that I connected
> one of my monitors through a DVI-VGA adaptor. As soon as I used a
> direct connection with a DVI cable, it started working.
> I also noticed that both monitors MUST be connected during X server
> startup. Furthermore, I cannot use radeonfb or radeon drm in my
> kernel (2.6.21-rc7). Consequently, I have DRI disabled in my
> xorg.conf (hope to get it one day, though).
> I use Option "MonitorLayout" "TMDS,TMDS" instead of your "TMDS,CRT".
> My X300 now works in MergedFB mode, with two 1680x1050 monitors,
> one connected with a DVI cable, one with a VGA cable.
> Please report about your progress, I'm very much interested in
> getting these Radeon problems solved, in the kernel AND in
> HTH,
> Hans

Ricardo Ribalda

More information about the xorg mailing list