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I have a LG 5k monitor that stopped reliably working at the correct resolution with Catalina and then, I think, got worse with Big Sur. MacOS just refused to ev
by nfriedly 3y ago
I have a LG 5k monitor that stopped reliably working at the correct resolution with Catalina and then, I think, got worse with Big Sur. MacOS just refused to even let me choose the proper resolution.
Forcing the DisplayPort version from 1.4 to 1.2 in the monitors settings (which would have the side effects of disabling DSC) allowed it to work correctly over Thunderbolt.
I eventually found a firmware update for the monitor that made it work with Macs in DisplayPort 1.4 mode again.
It worked fine with Windows all along, except that DisplayPort 1.2 meant I couldn't get full resolution at 60hz over the actual DisplayPort connection, only the TB3.
The whole saga is documented on https://apple.stackexchange.com/questions/388951/macbook-pro-sometimes-uses-incorrect-3440x1440-resolution-for-5120x2160-external https://apple.stackexchange.com/questions/388951/macbook-pro...