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(2019) 16" is HOT & NOISY with an external monitor! :(

Hollycene said:
I think your problem is in 120 HZ monitor. Set your monitor to 60Hz, Turn On Low Power Mode and "the fix" should be there. :) I also have installed 12.0.1 and with LPM with lid open and 2K LG connected, GPU is drawing 6-7 watts.
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Thank you. I was using it with thunderbolt usb type c to displayport cable. It was constantly draw 19w at 120hz. Now I connected it with hdmi cable via usb hub and it fixed. (arround 6w) But everytime I select 120Hz it goes 19w again.
 
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I'm having one doubt. My external display is running at 30Hz. Not sure why.
I can't select 60Hz.

Even after disabling Low Power Mode.
 
I can confirm that with an external monitor 1080p in my case and lid open it’s about 6 Watts when using 60Hz.
Running 120 or 144 will crank it back up to 19 Watts.
For me it’s no different if running with an usb c to DisplayPort cable or with hdmi connected to my type c hub.
Definitely not perfect but still a little improvement with 60Hz working fine.
 
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The fix isn't working here with a type-c to HDMI cable and an ultrawide monitor( LG 29’ 75Hz, 2560x1080p).

I've already tried switching resolutions and refresh rates and nothing seems to work, even with 1920x1080p at 50Hz.

Do you guys have any suggestions about what could I do?
 
akke4323 said:
I upgraded Mac OS Monterey. With a 4k 60hz external display which is connected with type c, Radeon High Side draws 15W. It used to draw 20W constantly when I was using Catalina/Big Sur.

Btw, I use my monitor with a 1440p scaled resolution.

When I was tried for the first time there is no difference with the low power mode. After I unplugged the monitor cable and then plugged it, I activated the ''low power mode''. Now it draws 7-9W.

Finally, after 2 years of waiting Apple solved the problem.

I have never heard my machine that silent.
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Same reading here, it is a progress, small but it is.
With lid closed all the same as in Big Sur 4-5W
 
My experience with Monterey.

I have a 34" UltraWide gaming monitor. By default, connected via usb-c, the monitor only shows 50hz or 85hz on the Display settings.

Using 50hz on both monitors didn't cause the wattage to be lower.

I had to use SwitchResX to force my external monitor to run at 60hz and then I have positive results.

Resume:

External: 85hz; Internal: 60hz; LPM ON/OFF: 20w.
External: 50hz; Internal: 50hz: LPM ON/OFF: 20w.
External: 60hz (Forced with SwitchResX); Internal: 60hz; LPM ON: 5-6w; LPM OFF: 15w (decrease of 5w)
 
Hm it's quite surreal to have the lid open with <2000rpm fan running.

Low power mode doesn't seems to give my any obvious performance struggling sign as well.
 
I updated to Montery today.

It does NOT work if I put my build-in screen at 59hz and 2x 4k external monitor to 60hz. Still 19-20w with or without LPM (low power mode).

If I change the build-in screen and 2x external monitor to 60hz. Without LPW, it dropped to 15.5w, with LPW, it dropped to 6.5w

So far the trick is all monitors has to have same refresh rate at 60hz.

I am now trying to reproduce an earlier bug/hack that allows LPM to be applied to GPU but not CPU....
 
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achandlerwhite said:
I’ve also noticed on the latest beta with monitor and internal screen I can turn on low power mode to get from ~16 watts to ~5 watts, then close the internal screen, then turn off low power mode and with only the external monitor it will stay at ~5 watts and I get full cpu power.

In experimenting it seems the Radeon power setting you have as you go from internal plus external monitor to external only will persist no matter what the low power setting is. So you can lock the Radeon at 5 watts or 16 watts regardless of the low power mode with external monitors only.
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I can't reproduce now.. Looks like this hack is "fixed"?
 
If the "hack" is only helping in clamshell (you don't say you open the Mac back up after switching off LPM) how different is the power level from what most users have been reporting on Big Sur in clamshell using SwitchResX (if needed)?

Anyway on the open-lid side I upgraded and can report that with a 4K/60Hz external monitor over Displayport from a Thunderbolt dock, I also see 15W normal, and 7-8W low-power. Knocks the total system use from around 35 down to 25 watts. I'm going to give low-power a try in normal working use and see if it feels like a slowdown. I've seen the posted Geekbench impact but those are artificial loads. FWIW I haven't encountered any obvious bugs with Monterey either – seems overall like more of a Snow Leopard upgrade.

EDIT: I see a hit of around 20% on compile times, but peaking at 40-50W instead of 100+. And most idle time is spent in the 20s instead of 40-50. Fans run at a barely audible speed. I'll take it for now.
 
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I can confirm that under LPM the wattage drops significantly. Lid open + 4k TB monitor (both 60 Hz) and Radeon High Side is just about 6–7 W while idle. On the other hand, the performance drops as well and I can feel it almost everywhere, the system is not fluent anymore. But I am glad that now I have a choice.
 
Jeo_cz said:
I can confirm that under LPM the wattage drops significantly. Lid open + 4k TB monitor (both 60 Hz) and Radeon High Side is just about 6–7 W while idle. On the other hand, the performance drops as well and I can feel it almost everywhere, the system is not fluent anymore. But I am glad that now I have a choice.
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I really hope they create a mode that only lower the GPU standby power without affecting CPU performance.
 
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Must be some kind of bug yeah, of course my M1 Air is different, but connected to a 5K monitor it is running a bit hotter , but it's 42 Degree.
 
I installed Monterey: right now I am on Zoom with lid open and Benq external monitor (both at 60Hz), with LPM I have 10/12 W and fans at about 4500 rpm. Not ideal, but also not bad
 
JosquinDesprez said:
I installed Monterey: right now I am on Zoom with lid open and Benq external monitor (both at 60Hz), with LPM I have 10/12 W and fans at about 4500 rpm. Not ideal, but also not bad
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You may benefit from cleaning the inside of the MacBook, if you had it in use for a long time with high speed fans and haven’t done it yet. This helped a lot for me and also with others in this thread before.
 
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silllli said:
You may benefit from cleaning the inside of the MacBook, if you had it in use for a long time with high speed fans and haven’t done it yet. This helped a lot for me and also with others in this thread before.
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Do you know if you can open the underside of the MacBook to facilitate cleaning, if you have AC+? Does it invalidate it?
 
MrGimper said:
Do you know if you can open the underside of the MacBook to facilitate cleaning, if you have AC+? Does it invalidate it?
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Sorry, I don’t know. Mine was cleaned by the Apple service because a (random) error came up in diagnostics and I complained about the heat and noise of the fans.
 
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CrysisDeu said:
So I can use a 27 or 32 inch?
Edit: And not hurting my neck.
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I have the Dell P3222QE (32") at 4K scaled and with LPM and lid open it (5300M entry model) draws about 5W - light load (browsing with firefox) the temp is around 50C and fan at 1700 rpm. And I live in the tropics.
 
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