Apple Event: May 7th at 7 am PT
MacOs updated today (Big Sur 11.1)and I can no longer get the 4K resolution for my external monitor (LG $K HDR 43) which I need. I am connected via USB-C on both ends and the resolution was fine before the update. Can any one help me roll back to 11.0?
MacBook Pro 16″, macOS 11.1
Same problem here.
Specs:
Automatic GPU switch (on/off) - It does not matter, the problem still exists.
Connected to the LG 4K monitor directly via TB/USB-C.
Each time after sleep or restart my Mac, the resolution of the monitor changes.
The availability of the option to select the resolution also changes, 1080p, 720p sometimes 1024x768 is MAX what i can get.
Other Mac with BigSur work's well (Macbook Pro 15 / 2017 / 16GB DDR3/ 256 SSD), i can get 4k 60Hz (no problem).
So APPLE must broke something with our Macbook Pro 16 with BigSur update i think..
One note, the connection via the HDMI adapter (original or for example satechi) allows me to 4k at 60Hz without any problems.. So it must be something with usb-c direct connection ..
I try to reinstall OS by wipe out partition, and install fresh BigSur, but problem still exist.
I try to reset NVRAM/SMC - no luck, problem still exist.
This absolutely fixed my woes.
The trick here is to connect via HDMI2.0 and set the required resolution.
remove the HDMI and connect back the thunderbolt-3 (usb-c) and the resolution is retained.
Edit: once the laptop goes back to sleep, the resolution is lost..
Resolved by using the top right PORT instead of top left.
Just wasted an afternoon troubleshooting this.
display resolution lost with MacOS update
