SOLVED: MacBook Pro 16" in clamshell mode is HOT & NOISY with a 1440p external monitor!

% system_profiler SPDisplaysDataType  | grep -C1 Resolution
S32D850:
Resolution: 2560 x 1440 (QHD/WQHD)
UI Looks like: 2560 x 1440 @ 60.00Hz
I switched to “Scaled” for demonstration purposes, but I typically just use “Default for Display”.
Measured using free OSS Stats. Source screenshot was 2560x1440. The equivalent statistic on iStat Menus is Radeon High Side.
Rocketing fans at nearly 100%
For demonstration purposes, when you look at “Scaled”, you get HiDPI options. When I actually use it, I use “Default for Display”
% system_profiler SPDisplaysDataType  | grep -C1 Resolution
S32D850:
Resolution: 5120 x 2880 (5K/UHD+)
UI Looks like: 2560 x 1440 @ 60.00Hz
Source screenshot was 5120x2880, due to HiDPI.
Basically silent fans
% bash -c "$(curl -fsSL https://raw.githubusercontent.com/xzhih/one-key-hidpi/master/hidpi.sh)"

_ _ _____ _____ _____ _____
| | | | |_ _| | __ \ | __ \ |_ _|
| |__| | | | | | | | | |__) | | |
| __ | | | | | | | | ___/ | |
| | | | _| |_ | |__| | | | _| |_
|_| |_| |_____| |_____/ |_| |_____|

============================================

(1) Enable HIDPI
(2) Enable HIDPI (with EDID)
(3) Disable HIDPI

Enter your choice [1~3]: 1

-------------------------------------
|********** Display Icon ***********|
-------------------------------------

(1) iMac
(2) MacBook
(3) MacBook Pro
(4) LG Display
(5) Pro Display XDR
(6) Do not change

Enter your choice [1~6]: 6

------------------------------------------
|********** resolution config ***********|
------------------------------------------
(1) 1920x1080 Display
(2) 1920x1080 Display (use 1424x802, fix underscaled after sleep)
(3) 1920x1200 Display
(4) 2560x1440 Display
(5) 3000x2000 Display
(6) Manual input resolution

Enter your choice: 4
Enabled, please reboot.
Rebooting the logo for the first time will become huge, then it will not be

Also, don’t forget to set the resolution to “Default for display” in settings.

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Tinkering around with things

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Tinkering around with things

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