Comment 136 for bug 745112

Just to be clear: forcing audio off every time the external display is configured, by using "xrandr ... --set audio off", does make it work reliably every time so far.

What I tested previously, and what did not work to turn it off just once and then use the system's normal configuration method (eg fn-f7), I guess because that is effectively configuring the monitor with auto audio.

So it does seem that the problem is related to audio; in my particular situation being able to force it off all the time would at least hide the problem. I don't care about sending audio to my monitor, but I suppose others do, so a patch that just turns it off across the board probably wouldn't be accepted.

I guess the next thing to work out is:

 * audio actually can't work on this channel with this resolution (not enough bandwidth?)
 * there's a bug in this monitor to do with audio at high resolution?
 * there's some other bug in the kernel about dp audio?
 * ...?