A Windows update a couple of weeks ago broke miracast on my laptop (Dell XPS13 9350 / i7-6560U / Iris 540). It broke on v1703, and the v1709 update did not fix it. My machine automatically installs all updates from Microsoft.
I depend on miracast, at home and work, and this has been pretty painful.
I know I can uninstall updates until I find the culprit (per How uninstall Win 10 update? (it broke my miracast) ), but I am more curious: How can I diagnose/troubleshoot miracast?
The symptom is:
My laptop sees the miracast display, and attempts to connect, but fails.
Sometimes it does connect, and it works for some minutes, before the entire wifi connection drops, losing inet and miracast in process.
In all cases I am using the microsoft hdmi dongle as the miracast receiver.
I know the problem is my laptop because:
1) Other laptops can connect to these same miracast receivers with no problem.
2) My laptop has the exact same problems across three different miracast receivers.
3) Before the updates, my laptop had no problems with any miracast receier
4) Installing "Feature update to Windows 10, version 1709" did not help at all.
I see multiple reports of this issue:
So, now that we have cooked it down, what do I do next to resolve properly?