MacBook 16-inch Fan Noise

Now I'm starting to get a little scared.

I was using my MBP for light browsing, been on for less than 30 minutes and I did a Google search in Brave. Every result that I clicked on opened up a new tab that displayed GPU glitches. I've attached a screenshot below.

Every page looked like this, or had parts that looked like this. I checked the temps, CPU, energy use and everything was normal. I was in clamshell mode.

I then opened up the MBP 16 lid and I dragged the corrupted browser window to the built in display. Exactly the same. I then refreshed. No change, same glitches.

I then opened up Safari and went to the same sites. The websites were displayed with no glitches at all in Safari.

I opened up my 2012 retina MBP and used Brave to go to the same sites and they displayed correctly.

I then unplugged my LG Ultrafine monitor and that switched the GPU back to the built in Intel. I then hit refresh and the websites that were glitching fixed themselves.

I think it's clearly the combination of Brave and the AMD gpu causing this.

"However both fans only runs at 1.7k RPM which is not very noticeable. Temps are averaging at 65 °C during casual web browsing with a Youtube video opened with the 3 externals displays + lid opened.

Still annoyed that Apple is not aknowledging the issue though."

If you're not experiencing such issues with 3 screens plus the MacBook Pro screen open and getting low temps then what is there for you to be annoyed about? I often wonder why you guys read these forums and still buy such a product and then still complain?

Connect more than two DVI or HDMI displays

Mac Pro supports a total of two DVI or HDMI displays when connected via the built-in HDMI port or using the Apple Mini DisplayPort to DVI adapter. To connect additional DVI displays, use an active DVI adapter like the Apple Mini DisplayPort to Dual-Link DVI adapter. You can connect up to six active adapter DVI displays. This requires a powered USB hub since Mac Pro offers four USB ports and you need six USB ports to connect the Dual-Link DVI adapters.

from:

Use multiple displays with your Mac Pro (Late 2013) - Apple Support

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Yes, I'm going to have to call them, as it just happened again. Now it happened in Lightroom, which is an essential app and use case for this machine.

How do I even describe this?

I want to search the forums as well and I'm stuck not knowing what to search for exactly, and frankly a bit overwhelmed. Have you seen this before? Any direction to discussions about it would be appreciated.

Can it be due to the heat issue... the dGPU runs especially hot and thus issues like this are created? I don't know...

I think Tim's machines, that he sent back, had this. I wish I can get a hold of him and ask him about it. I don't think there's a way to private message here, is there?

It was most certainly related and may explain why some of our machines are not seeing the heat and others are.

As for the screen corruption in the above post by pairadime - you should contact Apple right away. I don't think that's heat so much as defective. If it is heat bringing out the corruption then the tolerance on that chip is way too low and defective. The other thing you could try is if lightroom has an option to turn off Metal. I have seen funny screen issues that go away when Metal is turned off for that program. They update the program and then the problem is gone. I would report it to Adobe too and see if anyone in their forums is having the issue.

The Adobe programs have so much legacy code, IMO, that compatibility bugs crop up all the time and it doesn't seem to matter if it's Acrobat, Indesign or photoshop. I don't use Lightroom anymore (even though I have the license) as I prefer CaptureOne for processing my photographs.

Thanks ! Wizardthegreatest

I agree with you 100%

"usually people with most rank points provide most useful information. In this thread these are the people who keep repeating that the problem doesn't exist whereas people who are new to the community keep posting possible temporary workarounds to the problem."

We are grateful for your input!

Thank you brycesteiner

I certainly did wade through this thread trying to work out ways to improve things. I did try all the free options that were posted but nothing has worked so far. I am in consultation with support too. We shall live in hope and in ignoring DPJ.

"I don't think there are any reported case of Apple repairing this issue. Not sure why you are suggesting this?"

Because that's what you do when someone has an issue here. Refer them to the manufacturer since they do make the product.

"I meant suggesting an actual physical repair from Apple when we can safely assume every 16" has the issue when connected to the same combination of resolution and frequency."

I did not suggest a repair. Did you read where I said? "They may want you to send it in for repair".

Not sure why you feel the need to berate my suggestion to reach out to Apple. After 6 months of this thread there's been no solution from members to satisfy what they want out of this so suggesting to contact Apple makes more sense.

Thank you so much Andyou!

For those of us past our 14 day return period and who have already taken our MBP 16’s to the Genius Bar and spent hours on the phone with Apple Care ( with no solution to our issues) asking us to “ Return your MacBook to Apple is not a solution “ for us?

these boards exist for members To try and problem solve issues that still exist after reaching out to Apple.

DisplayPort use an optional feature called "DisplayPort Dual Mode" when you adapt it to heartbeat-refresh protocols like HDMI.

The port switches the timing and signals to be compatible with those older protocols, but does not boost the signal levels from DisplayPort 3.3 Volt levels to HDMI 5 Volt levels. That is why if you attempt to drive more than two HDMI displays, one will drop out [without an ACTIVE adapter (that re-drives the signals at 5 volts)].

Grant Bennet-Alder wrote:

DisplayPort use an optional feature called "DisplayPort Dual Mode" when you adapt it to heartbeat-refresh protocols like HDMI.

The port switches the timing and signals to be compatible with those older protocols, but does not boost the signal levels from DisplayPort 3.3 Volt levels to HDMI 5 Volt levels. That is why if you attempt to drive more than two HDMI displays, one will drop out [without an ACTIVE adapter (that re-drives the signals at 5 volts)].

I see, that would explain why I have to plug / unplug one HDMI sometimes or else I get one monitor with no signal. I guess the adapters I'm using are considered ACTIVE since they also have a USB-A input that needs 5V, but its also some cheap 20$ adapters from Amazon.

Will I get a better dGPU performance replacing 2 x 1440p@60hz HDMI interfaces with DP?

HDMI requires the computer to supply the heartbeat refresh that is required to run a CRT display. The entire screen data, changed or not, must be presented every refresh period (typically 60 times a second) with some fairly tight timing requirements. If not, the missing scan lines will be blanked out. Too many of those and the screen starts to flicker.

DisplayPort displays have a screen buffer. Their refresh comes from their own screen buffer. They drop the heartbeat refresh for a packet interface that includes only the changed data. When the screen stops changing (which is a LOT of the time) the link goes nearly quiet. That takes less energy.

What perplexes me is that in this model MacBook Pro, these displays do not seem to drop the memory timing and required power when only DisplayPort displays (no Dual Mode) are connected.

"There are many youtube Videos that are not well-suited to the Video medium, and exhibit poor production values. Please do not post that useless YouTube Video again. There is nothing that guys adds to the discussion that has not already been said is a few terse words. "

Thank you. Couldn't have said it better myself. That guy is useless and is trying to compete with the BIG YouTubers by creating negative Apple videos to get clicks. He also puts out misinformation and no facts and his own viewers corrected him several times on things he's said about the MacBook Pro 16". IMO links to these YouTube videos should not be allowed on the community discussion.

In the long run, the path you suggested should produce the best results and generate the least heat.

I continue to recommend DisplayPort family displays because they send less data and have the possibility for generating less heat and are capable of higher resolutions with less fiddling than HDMI.

Before users rush to beat me up, I also acknowledge that in experimental data seen here to date, Users' results do not suggest a clear-cut heat/noise advantage over HDMI in most cases, using the current software.