radeon driver only detecting one monitor

[Alex Deucher]

On 11/7/05, lynx.abraxas at freenet.de <lynx.abraxas at freenet.de> wrote:
> Hallo!
>
>
> My problem is:
>
> When  I  start Xorg with my TFT-monitor conected to my laptop only my external
> TFT gets detected and thus leads to X running only on that one.  And  I  can't
> get xinerama or dual config to work.
>

you need to force the second head on with the monitorlayout option if
the driver fails to detect teh second monitor. see the radeon man page
for more info.  e.g., add this to the device section of your config:
Option "MonitorLayout" "LVDS, CRT"

Alex

> My system:
>
> I hava a laptop with a Radeon Mobility M9 9000 with an external vga connector.
> I connect an externel TFT Monitor to it with 1280x1024. The   laptop   monitor
> just  has  1024x768.  I have also a Silicon Integrated Systems [SiS] 5591/5592
> AGP which works fine with radeon acceleration under my SuSE and under  my  LFS
> with  Xorg.  I  am  now  running  Xorg  6.8.2  on my LFS with a VESA fb or the
> radeonfb.
>
> What I want:
>
> I want an X running on both monitros with 1280x1024 on both or  1280x1024   on
> my  external   and  1024x768 on the laptop monitor. (last one needs tow screen
> section if I'm not mistaken? And the benefit of  the  first  configuration  is
> that one  can use an overlay video driver to watch a film on the external?)
>
> Details:
>
> I  can  remember  conecting  a  beamer  to  my laptop and I got fine output by
> pressing the keys for external output. However with my TFT  it  doesn't  work.
> The  logfile seems to tell me that the radeon driver is not finding the second
> monitor. Strange is that normally my laptop LCD is the  primary  and  external
> the  second. I totally have to unplug the TFT for my laptop LCD to be detected
> again.
> I also tried XFree86 and that gives me  1280x1024  on  both  but  crashes  the
> second time I start it. So I'm back to Xorg.
> Does anyone have an idea or a hint what I should do? Also I would like to know
> how I have to calculate the values for a modline entry that gives me 1280x1024
> with  75Hz.  How  can  I  prevent default modes to be loaded and how do I know
> which mode is taken at startup? Will it be possible to use overlay video on my
> TFT  in  dual  head  layout?  I  also dont't get the meaning of the WW-warning
> 1600x1200. Is there a way to get the h-/ and v-sync values for the laptop  LCD
> (no  values  in  the  manual)?  And  at  last,  can  I  damage  anything  when
> experimenting with TFT/LCDs?
>
> Any help or hints are very appreciated
> Thanks in advance
>
> Lynx
>
>
>
>
>
>
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