Hello again,
I managed to log debug messages of SpringBoard and Preferences app in 1.2.0 firmware, but there were no info about accessorys.
So I downgraded my iphone to 1.1.4 firmware and the cable works!
Here are the debug messages of Preferences app -
If I plug the cable in:
2008-08-01 11:07:21.729 Preferences[68:d03] accessoryAvailabilityChanged: lingoMask: 0 availability: 0
2008-08-01 11:07:21.741 Preferences[68:d03] accessoryAvailabilityChanged: lingoMask: 0 availability: 0
2008-08-01 11:07:24.327 Preferences[68:d03] accessoryAvailabilityChanged: lingoMask: 0 availability: 0
2008-08-01 11:07:24.332 Preferences[68:d03] accessoryAvailabilityChanged: lingoMask: 0 availability: 0
2008-08-01 11:07:24.351 Preferences[68:d03] accessoryAvailabilityChanged: lingoMask: 13 availability: 0
2008-08-01 11:07:24.355 Preferences[68:d03] accessoryAvailabilityChanged: lingoMask: 13 availability: 0
When I unplug the cable:
2008-08-01 11:07:35.587 Preferences[68:d03] accessoryAvailabilityChanged: lingoMask: 13 availability: 0
2008-08-01 11:07:35.592 Preferences[68:d03] accessoryAvailabilityChanged: lingoMask: 13 availability: 0
2008-08-01 11:07:35.656 Preferences[68:d03] accessoryAvailabilityChanged: lingoMask: 13 availability: 1
It seems like this cable has Apple Universal Dock accessory ID 13 as stated in Xian's post
here
So it looks to me that Apple has patched out support for accessory ID 13 from 1.2.0 firmware?
But I can't understand why it works about a little time and then a message pops out about incompatible accessory.
There is also one difference behaviour in 1.1.4 and 1.2.0.
In 1.1.4, if I have cable plugged in and I start video or slideshow, then a message pops up asking if I wan't it to watch on TV.
But in 1.2.0, cable plugged in, no message pops up if I start video or slideshow, it just plays on TV about 90 secs and then it stops and complains about incompatible accessory.