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Dual Screen, Debian Squeeze, ATI RV516 and Xrandr

From http://forums.debian.net/viewtopic.php?f=6&t=45273: 

Hi all,

I'm running debian Squeeze at my work.  Yesterday debian updated the 
xserver packages.  From this morning my ATI config won't work.

  aticonfig reports: No supported adapters.

Is this a known problem? There's no such thing like roll-back, right? :(
My card is:
VGA compatible controller: ATI Technologies Inc RV516 [Radeon X1300/X1550 Series]

Hope someone knows a fix! Thanks!

Regards,
Maurice

mauserrifle
The reply: 
Re: Ati broken after xserver update

Postby sickie � 2009-09-18 12:45

Aticonfig is a part of fglrx driver.  Older versions of fglrx don't support 
the new xorg server while your card isn't supported in newer versions of 
fglrx (those that support newer X).  My recommendation is to uninstall 
fglrx and use radoen driver which is built in xorg).  Check 
http://en.wikipedia.org/wiki/Fglrx where you'll find versions of fglrx with 
brief changelogs.

I am in the same boat. And as a result I cannot get dual-screen to work.

So, revert from fglrx to radeon: 

Section "Device"
    Identifier  "ATI"
    Driver      "radeon"
EndSection

Section "Screen"
    Identifier "Default Screen"
    DefaultDepth     24

    SubSection "Display"
    Depth 24
    Modes "1280x1024" "1280x1024" 
    Virtual 2560 1024
    EndSubSection
EndSection
and use xrandr: 
xrandr -q

Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 2560 x 1024
DVI-1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
   1280x1024      60.0*+   75.0  
   1152x864       75.0  
   1024x768       75.0     60.0  
   800x600        75.0     60.3  
   640x480        75.0     59.9  
   720x400        70.1  
DVI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
   1280x1024      60.0*+   75.0  
   1152x864       75.0  
   1024x768       75.0     60.0  
   800x600        75.0     60.3  
   640x480        75.0     59.9  
   720x400        70.1
so 
  xrandr --auto --output DVI-0 --mode 1280x1024 --right-of DVI-1

Examples

Set up two monitors, same resolution: 

  xrandr --auto --output DVI-1 --mode 1280x1024 --right-of DVI-0

Set up two monitors, different resolution: 

  xrandr --auto --output DVI-0 --mode 1600x1200
  xrandr --auto --output DVI-1 --mode 1280x1024 --right-of DVI-0