I connected my Raspberry to my LG TV via HDMI and loaded the Debian 6 image onto the SD card, but altough I tried tinkering with config.txt and updated my firmware as well, I am still unable to get any video signal on my tv set ("No signal"). At least I am able to use SSH.
This is what read-edid says about the output of /opt/vc/bin/tvservice -d:
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pi@raspberrypi:~$ parse-edid edid.dat
parse-edid: parse-edid version 2.0.0
parse-edid: EDID checksum passed.
# EDID version 1 revision 3
Section "Monitor"
# Block type: 2:0 3:fc
Identifier "LG TV"
VendorName "GSM"
ModelName "LG TV"
# Block type: 2:0 3:fc
# Block type: 2:0 3:fd
HorizSync 28-67
VertRefresh 50-75
# Max dot clock (video bandwidth) 150 MHz
# DPMS capabilities: Active off:yes Suspend:yes Standby:yes
Mode "1360x768" # vfreq 59.799Hz, hfreq 47.720kHz
DotClock 84.750000
HTimings 1360 1432 1568 1776
VTimings 768 771 776 798
Flags "+HSync" "-VSync"
EndMode
Mode "1280x768" # vfreq 60.352Hz, hfreq 48.161kHz
DotClock 80.140000
HTimings 1280 1344 1472 1664
VTimings 768 771 778 798
Flags "-HSync" "-VSync"
EndMode
# Block type: 2:0 3:fc
# Block type: 2:0 3:fd
EndSection
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pi@raspberrypi:~$ /opt/vc/bin/tvservice -s
state: HPD low|HDMI off|NTSC mode|composite CP off (0x140001), 720x480 @ 60Hz, interlaced
pi@raspberrypi:~$ /opt/vc/bin/tvservice -p
Powering on HDMI with preferred settings
[E] Failed to power on HDMI with preferred settings