Same situation for me here. MacBook Air (M1) - External display = HP Z27k G3
None of the posted solutions in this thread have worked. I even replaced the USB hub to one that was recommended as a fix (SMK Link USB-C Multi-Port Hub, Model VP6920). I used to have a crisp 2560x1440 display, but now it is blurry.
Almost all of the options have "(low resolution)" next them except 1920x1080 (Default) and a few others that are not what I want (and had). Images attached.
Made a support call to Apple. They had me restart Mac and Monitor. When I did, It actually made the 1920x1080 (Default) option blurry as well. It appears that it only offered 30 Hertz before, but with restart it offered 50 or 60 Hertz.
Solution: The Apple support rep suggested we remove the HDMI cable connection (via USB) hub, and go with a straight USB-C cable between MacBook Air and HP Monitor. It worked. External display now renders 2560x1440 but in the Apple native display dialogue and not the long list of resolution options.
The bonus is that the USB-C cable also provides power so that I don't really need the USB hub at this point (unless I am connecting traditional USB devices / ports).
None of the posted solutions in this thread have worked. I even replaced the USB hub to one that was recommended as a fix (SMK Link USB-C Multi-Port Hub, Model VP6920). I used to have a crisp 2560x1440 display, but now it is blurry.
Almost all of the options have "(low resolution)" next them except 1920x1080 (Default) and a few others that are not what I want (and had). Images attached.
Made a support call to Apple. They had me restart Mac and Monitor. When I did, It actually made the 1920x1080 (Default) option blurry as well. It appears that it only offered 30 Hertz before, but with restart it offered 50 or 60 Hertz.
Solution: The Apple support rep suggested we remove the HDMI cable connection (via USB) hub, and go with a straight USB-C cable between MacBook Air and HP Monitor. It worked. External display now renders 2560x1440 but in the Apple native display dialogue and not the long list of resolution options.
The bonus is that the USB-C cable also provides power so that I don't really need the USB hub at this point (unless I am connecting traditional USB devices / ports).
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