Previously I could run 5K only in DP 1.2. The thing now works over Display Port 1.4 in full 5K. I did a factory reset on my 34WK95U and connected it back to MacBook Pro M1. The update process took very long, about 45 min. To my surprise, it detected a firmware update! I was updated from 3.11,0,2.xx to 4.12, 16, 4.17. I connected my 34WK95U via USB-B as an upstream instead of USB-C and HDMI for video. I don't like to give up so today I set up a Windows 10 laptop and installed an LG OnScreen Control. This software does not work on Big Sur just yet. I tried with Catalina on several occasions with different LG monitors like LG 27UK850-W and LG 34WK95U there were a bunch of wired errors or the app was saying that the firmware is up to date. The software never worked on macOS though. I knew that there are firmware updates for LG monitors and one could apply these with a software called LG OnScreen Control which can be downloaded directly from lg.com. I thought I would share some of my findings and a bit of progress I made. I do think these are software problems and not hardware so a little patience to let Apple get a couple of updates out will probably resolve these issues. I'm probably going to download the latest developer beta of Big Sur this weekend to see if that resolves or at least helps. Also with an LG monitor though mine is a cheap 24" 4K. I'm seeing very similar problems with a M1 MacBook Air. The setup is: MPB(M1) Elgato Pro Dock LG 34WK95U. But even with the lead open, I can see that the MBP at first wakes up build-in display and later it attaches the external one which obviously makes all the open windows to be resized. The only thing which works is opening the lead. Something happens because I can see the monitor backlight goes on and it searches for the video source but eventually, it fails and goes back to sleep. Every time I wake up my MacBook Pro from sleep by clicking the mouse or keyboard monitor does not wake up. What solved the issue was to downgrade the DP protocol from 1.4 to 1.2 and now it works with 5120x2160 but only when it wakes up. At first, I could not get it to run 5K at all it was stuck at some wired 3xxx x 1440. I'm facing a pretty annoying issue with the external monitor LG 34" 5K LG 34WK95U.
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