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(2019) 16" is HOT & NOISY with an external monitor! :(
- Thread starter Appledoesnotlisten
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Please don't troll, people deserved to have Apple owning up to fix their mess.
To give some perspective though as I was able to try out the M1 Pro 14" - I can confirm there is no heat / fan noise / anything when using the computer. If you don't look at the screen, you won't even know if the computer is on / has been running or not. So yeah, the grass is greener on the other side but the Intel fight is a good fight.
Looks like Monterey somehow fix this issue a little bit. But I was afraid while updating macOS, heard some of macs had been killed by this update (may be it's fake, don't know). Also, Radeon High Side is still at 16W, but temperature is lower and fans don't make much noise. Or may be, it's because of winter and low room temperature 
Have MBP 16" base model (with lid opened) + external monitor (FHD) connected by adapter type-c => HDMI.
Have MBP 16" base model (with lid opened) + external monitor (FHD) connected by adapter type-c => HDMI.
This topic was already discussed here. But if you missed that posts, Monterey “fixed” issue and dropped GPU wattage from 18 to 14/15 watts. Also if you turn on low power mode in settings, you get 6-8 watts for GPU with external displays attached. I use 2 external displays with lid open and get 6-7 watts on GPU.Looks like Monterey somehow fix this issue a little bit. But I was afraid while updating macOS, heard some of macs had been killed by this update (may be it's fake, don't know). Also, Radeon High Side is still at 16W, but temperature is lower and fans don't make much noise. Or may be, it's because of winter and low room temperature
Have MBP 16" base model (with lid opened) + external monitor (FHD) connected by adapter type-c => HDMI.
I already did, dude! I bought a 10 core 14" M1 Pro for my cousin, and played around for a week, tested Mathematica and scientific computing on it. Thanks but no thanks. My 2019 16" Intel i9 MacBook is twice as fast. I'll hold on to my i9 MacBook for as long as I can, and will switch to a Surface Laptop Studio for teaching with a stylus and coding with CUDA on the Nvidia GPU. I have absolutely no use for the M1. A Fischer Price laptop is more useful to me.
There were a few suggestions:
Replace GPU kext with cracked version that always set the LPM flag to true
Changed kext settings to change GPU max power state
Flashing the GPU with modified bios that changed memory clock
However none of us has the courage and technical knowledge to try this
I've tried but honestly i didn't tried all my options because the other options about trying to "crack" the kext file was to risky for me at this time. This is my working machine and i can't risk being a full day restoring system and reinstalling all my stuff.
In my Christmas holiday's if nobody take the leap i will do a full time machine backup and start trying to crack the kext file.
I think i've the technical knowledge just not the time and i can't take the risk right now for the reasons above.
Flashing GPU Bios it's a little harder and i think it will break the Mac boot because some kind of bios signature that apple puts in, but i'm not sure about this last point.
LPM seems to have done the trick for me in clamshell connected top external monitor these days.
What is causing the laptop to run -warmer- when the screen is off.
Laptop in clamshell with monitor on, you can just feel a faint wisp of heat on the lid by the back vent.
If I turn the monitor off, walk away and come back to the laptop (still in clamshell) 30 minutes later, it feels -warmer- to the touch.
I've replicated this a few times. Cooler when the monitor is on, a tad warmer when you check it (after turning monitor off)
What is causing the laptop to run -warmer- when the screen is off.
Laptop in clamshell with monitor on, you can just feel a faint wisp of heat on the lid by the back vent.
If I turn the monitor off, walk away and come back to the laptop (still in clamshell) 30 minutes later, it feels -warmer- to the touch.
I've replicated this a few times. Cooler when the monitor is on, a tad warmer when you check it (after turning monitor off)
Yes - that’s why I am now transferring data from that model to a new MBP. even with the external monitor turned off, the 2019 is still running very hot, even though it’s on a stand. The new one - not hot at all even though it’s directly on the desk top. Once all the stuff finishes transferring, can’t wait to hook it up to the external monitor to see how it does.
also, not long after I got the 2019, I brought it into the “geniuses” to see why it was so hot & loud. He said that’s just the way they are
also, not long after I got the 2019, I brought it into the “geniuses” to see why it was so hot & loud. He said that’s just the way they are
Try looking up the external monitor with HDMI instead of Lightning. See if it goes away. It solved my 2013 mbp fan and heating and lagging issues.
I went from a maxed out 2019 16 inch to a maxed out 14 inch M1 Pro and couldn't be happier. So far it's been completely silent with my typical workflow connected to a 4K screen. That's the laptop I've been waiting for! Unfortunatelly Apple released it 2 years late and I couldn't hold on to my late 2013 MBP any longer because... you've guessed it, it was even louder connected to a 4K screen.
I connected my late 2013 13" to a 4k screen, using a Mini-DP cable. The best I managed to get is 4k@52hz, but the laptop is virtually silent. How comes yours was so loud?
My older 2015 mbp 13 is also silent most of the time even with 2x 4k monitor and open lid.
I had a 15" one with a dedicated GPU (NVIDIA GeForce GT 750M) and was able to get full 60Hz. So must be because of the dGPU.
FWIW, the 2019 16" Macbook Pro had the Radeon Pro 5500M.
except that they run iPad OS induced apps and emoji things
which is not Mojave.
Viva Los Mojavians!
That makes sense, I read about the dGPU being so loud while on external displays.
LPM still works for me in 12.1, no need to unplug/plug.
(rpm < 2000, 60C on light work)
(My upgrade process was this: open lid + LG5K connected)
(rpm < 2000, 60C on light work)
(My upgrade process was this: open lid + LG5K connected)
In my experience, it runs fairly cool and quiet without an external monitor unless you are doing CPU-intensive work.
I actually can’t use mine on the lap for web dev task. Mine is i9/5500 and runs hot by itself.