tv-out only b/w on ATI Technologies Inc M24 1P [Radeon Mobility X600], using ati as well as fglrx driver

:~$ lspci
00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to DRAM Controller (rev 04)
00:01.0 PCI bridge: Intel Corporation Mobile 915GM/PM Express PCI Express Root Port (rev 04)
00:1b.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 1 (rev 04)
00:1c.2 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 3 (rev 04)
00:1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 04)
00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 04)
00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 04)
00:1d.3 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #4 (rev 04)
00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 04)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev d4)
00:1f.0 ISA bridge: Intel Corporation 82801FBM (ICH6M) LPC Interface Bridge (rev 04)
00:1f.1 IDE interface: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) IDE Controller (rev 04)
00:1f.2 IDE interface: Intel Corporation 82801FBM (ICH6M) SATA Controller (rev 04)
00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus Controller (rev 04)
01:00.0 VGA compatible controller: ATI Technologies Inc M24 1P [Radeon Mobility X600]
02:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8036 PCI-E Fast Ethernet Controller (rev 10)
06:00.0 CardBus bridge: Texas Instruments PCIxx21/x515 Cardbus Controller
06:00.2 FireWire (IEEE 1394): Texas Instruments OHCI Compliant IEEE 1394 Host Controller
06:00.3 Mass storage controller: Texas Instruments PCIxx21 Integrated FlashMedia Controller
06:00.4 Generic system peripheral [0805]: Texas Instruments PCI6411/6421/6611/6621/7411/7421/7611/7621 Secure Digital Controller
06:02.0 Network controller: Intel Corporation PRO/Wireless 2200BG Network Connection (rev 05)

grep Version /var/log/Xorg.0.log
X Window System Version 1.3.0
X Protocol Version 11, Revision 0, Release 1.3

xrandr output:
--> Screen 0: minimum 320 x 200, current 1280 x 768, maximum 1280 x 1200
VGA-0 disconnected (normal left inverted right)
LVDS connected 1280x768+0+0 (normal left inverted right) 0mm x 0mm
 1280x768 59.9*+ 60.0
 1024x768 60.0
 800x600 60.3
 640x480 59.9
S-video disconnected 800x600+0+0 (normal left inverted right) 0mm x 0mm
 800x600 60.3*

According to http://wiki.x.org/wiki/radeonTV I tried:

xrandr --addmode S-video 800x600
xrandr --output S-video --mode 800x600

--> I got a picture on my television, but it is in b/w.