I've got the same problem trying to display on a PAL CRT television
using a VGA-> SCART lead.

mobo:         Albatron KI690-AM2   with onboard  RS690G  chipset  (Radeon 
Xpress 1250)
OS:            OpenSuSE 10.3  with 2.6.24 kernel    for x86_64      
X server      7.2.0
xorg.conf:   Driver    "radeon"            #   version 6.8.0  built from git 
repository as of Apr 1st 2008  (commit fc9af578...1b0e)
                 Modeline     "768x576i" 14.76 768 824 888 944  576 581 586 625 
 -hsync -vsync interlace

When I try the  xrandr  switch  the black vsync gap disappears so I get full 
screen, but the y-coords are wrong (- looks like the X mouse events are  
generated as y-mouse co-ord x 2)  and only a fraction (top left corner)  of my 
desktop is visible.
The patch has no effect on my setup - presumably legacy_crtc.c not used for my 
card...  does anyone have any clues as to a work-around until this bug is fixed 
properly ?  I had a quick look but didn't spot the same code to what was 
changed in the legacy_crtc.c patch...

I also tried the 'radeonhd'  v1.1.0  driver, but looks like it won't
support interlace  yet...

Thanks
Mantis

-- 
interlacing broken in gutsy on radeon/ati open source driver
https://bugs.launchpad.net/bugs/144322
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