Macbook 2016 HDMI output flickering

I second this. I have two 2415 Dell's. Moving on to the beta's resolved the black screen flickering.

Yes, I can confirm that.

Yesterday weirdness started exactly on mirror mode. However switching back to extended mode didn't solved it. Only a reboot.

In my humble opinion, USB-C display is much more sensitive to small cable and display standard deviations than DisplayPort did.

but there's something about Sierra that is not working as it should. Some users report fans kicking on previous retina generation machines.

I found out that if you switch your audio to another device like for example the internal speakers that flickering does no longer appear. This works with internal speakers and also with my USB-C dock.

So just connect the screen using the HDMI - USB-C adapter, click on the Volume icon and hold the ctrl key and then switch to internal speakers or any other device.

Let me know if it works for you as well...

For users of the LG 27UD88 monitor connecting over USB-C, I have installed beta 4 and can report the following:

1. Straight after installing the beta I experienced a lot of visual glitches and artefacts on the LG monitor, which seemed to be caused by moving windows around the screen. Some artefacts were static (like black lines or patches of pixels) but others were flashing and strobing, which was very distracting
2. After a few minutes of this I decided to open System Preferences and see if changing resolution improved things. As soon as I selected a new resolution both screens went black, there was a kernel panic, and I saw the black "Your computer restarted because of a problem" screen
3. Since this episode (approx 36 hours ago) everything has been working well, and the LG monitor seems to display an image much more quickly after connecting the USB-C cable
4. When I came into my office this morning and pressed a key on my MacBook the LG monitor immediately beeped and turned on. Previously I would get a black/unresponsive monitor each morning and would need to restart the MacBook and disconnect/reconnect the power supply of the monitor before I could start work.

I have sent the crash report for the kernel panic to Apple via Feedback Assistant, so hopefully they are aware of it.

Fingers crossed the stable performance continues under this beta and this issue may be resolved once and for all!

I've been following this thread for a while, as I've had the same issue since I purchased a 2016 MacBook in October. I've seen flickering (each dropout lasting about four seconds) with two different external displays, connected via HDMI and the Apple multi-port adapter. The problem seemed to disappear every time the machine was restarted, but the flickering began anew after a couple days' normal use. An Apple representative had me reset the NVRAM, which did work temporarily, likely only because the process involved a reboot. Not only did the issue cause external displays to flicker while in use, but when the computer was asleep, the monitors would turn on intermittently. This, too, was very annoying.

This was not the only problem: I noticed on my first day with the machine that my bluetooth mouse was responding slowly and erratically when my computer was connected to my home wifi network. I worked around this issue by replacing my wifi router with a dual-band router, and by connecting my computer to the 5 GHz band. I do wonder if interference is the root of all of these problems.

Regardless, updating Sierra to the third beta release, and then to the fourth, seems to have almost completely resolved the monitor issue. There is still a little bit of weirdness, with the external monitor turning on without any discernible reason while the computer is asleep, so using an external monitor with the 2016 MacBook is not quite the same as it was with my 2010 MacBook Pro...but at least we know they're working on it, and I'm no longer inclined to trade my new machine for a 2015 Air.

I can confirm as well that installing the beta 4 helps and cures the problem for me.

in addition to it "flickering" going to black and then back again, my 2016 12" Retina Macbook will display gray snow on my Dell 4k monitor through the Apple USB-C digital AV adaptor.

Once when I switched to a different monitor, and then switched back, it worked for an entire day. But now it's back to flickering. I note that the laptop hangs a lot more with a hard reboot required than any mac laptop I've owned.

Going to upgrade to Sierra and try the beta version to see if that fixes it.

General update: I found Beta 3 to entirely fix my issue (multiple different monitors, HooToo, Apple and VTIN dongles) and Beta 4 seems to be more of the same. All looking good!

On the negative I've still had no contact from Apple on this topic. I reached back out after hearing nothing from my Tier 2 chap after 2 weeks. Other than getting a profuse apology from a different Tier 2 guy I've had nothing else. From my perspective it feels like they've been told to employ total radio silence on this issue now.

Frustrating.

Been a while since I posted here, pretty much gave up using my MacBook since the issue began as using an external monitor is vital to me. Been using Windows 10 since and enjoying it a lot frankly. Looks like b4 solves the issue on the OSX side but I've just install bootcamp on the MacBook and I'm seeing the same issue there too; Apple (if you're reading) are you planning on fixing it there too?

Thanks,

Adam

I have been having the same problem since day one with my MacBook (Retina, 12-inch, Early 2015). I have tried numerous monitors and numerous dongles. I have also tried both yosemite and sierra. It's definitely the macbooks usb-c port.

Sign up for the public beta, latest resolves the issue in macOS at least it seems.

USB-C support has felt distinctively half-baked, very un-Apple, new MBP owners are having issues too it seems.

6th beta has no flickering issues, but weirdness is now much more common with external projectors. Sometimes it goes ok after some seconds, sometimes a reboot is required.