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Re: getting wireless and dvi out (clone mode) to work on iBook G4 - help needed, plz

On Wed, Nov 28 2007, at 10:59 -0500, P Kapat wrote:
> Hi Elimar,
> On 11/27/07, Elimar Riesebieter <riesebie@lxtec.de> wrote:
> > On Wed, 21 Nov 2007 the mental interface of
> > P Kapat told:
> >
> > [...]
> > > Similarly, I have tried different configurations for xorg.conf (from
> > > other distros and general googling) to mirror the LCD screen to a
> > > projector in clone mode - no results, hence I am here.
> >
> > I was adviced to have a look at
> >
> > http://wiki.debian.org/XStrikeForce/HowToRandR12
> Thanks for the link, it is indeed very helpful. Wish I had seen this
> link before going through all the trouble... I have bookmarked it now
> :)

Or simply searching the archives of the xorg-driver-ati mailing list,
with a Google search like:
site:lists.x.org/archives/xorg-driver-ati/ <your search pattern>

And just in case someone could use it:

I didn't find the following via Google, but in the ati driver sources:
It seems it's impossible to have the complete content of the LCD
screen mirrored on an external monitor, as long as the LCD is switched

So I do something like this to get the complete LCD content mirrored
to an old VGA: 

xrandr --output DVI-0 --mode 1280x1024 --rate 60.0
xrandr --output LVDS --off

After executing the first line, the LCD content is cloned partially to
the VGA, i.e. about 10% of the LCD content is missing on the VGA
screen. This is fixed as soon as I switch off the LCD with the 2nd

$ xrandr -q
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 2720 x 1024
LVDS connected (normal left inverted right x axis y axis)
   1440x960       59.9 +
   1280x800       60.0  
   1280x768       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        59.9  
DVI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 300mm x 225mm
   1280x1024      60.0* 
   1280x960       59.9  
   1280x800       60.0  
   1280x768       60.0  
   1024x768       85.0     84.9     75.1     70.1     60.0  
   800x600        84.9     85.1     75.0     60.3  
   640x480        85.0     84.6     75.0     60.0     59.9  
   720x400        70.1  
S-video disconnected (normal left inverted right x axis y axis)

I'm not sure I understand correctly what the author meant to indicate
with the following. At any rate, IIRC, the two-liner above dawned to
me after reading this:

README.ati, excerpt: 
In situations where the driver is to simultaneously display on both
a panel and a CRT, the same image will be seen on both.  In
particular, this means the CRT must be able to synchronise with the
timings of the panel's native resolution.  This is quite evident
when the panel has ``odd-ball'' dimensions, such as 1400x1050, a
resolution not commonly possible on CRTs or projection equipment.

Also, the display of independent images on the panel and CRT is not
currently implemented, and might never be, pending resolution of
the previous item.

If screen dimming is enabled here, via
pbbcmd config onac_timedim 1800
then the screen on the switched off LCD is coming back
partially/garbled, as soon as the LCD screen is getting dimmed (after
~ 3 mins. of inactivity ..)


Best Regards
Wolfgang Pfeiffer: /ICQ: 286585973/ + + +  /AIM: crashinglinux/

Key: 0xE3037113

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