Can also report that I'm now having problems with the adapter. Previously I've only used it for short moments at a time so I didn't notice it back then but now that I tried watching a movie, it was pretty terrible.
I've been working with pershoot on this and he might have a fix for it. My initial testing has been promising but it's too early to say for sure.
For those of you having the flickering issue, give pershoots kernel (here) a test run. After intensive testing with him, he managed to fix the flickering almost completely for me and my adapter is now useable.
Tried with two cables on two TVs both flicker about every 4 seconds with a slight break in sound. One TV loses sync and the picture disappears for a couple of seconds and then comes back. The other just glitches with a slight loss in sound.
I have tried turning it on from cold unplugging and plugging it back in, battery at 50% battery at 100%.
My guess is that the problem is with the cheap switched mode power supplies that they use for these devices. The electrical noise introduced is not going to help get high frequency signals to a TV.
This would tie in with why battery charge level has an impact - low battery = more noise as the charger pumps out more current.
It is also a real pain that the charger has to be plugged in as it destroys so much of the portability and introduces so many extra cables.
Can we get any more feedback on if the custom rom by pershoot helps reliably ?
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