Wrong resolution in clamshell mode

[GuiFlam]

Hi.

I have successfully installed mac os and it works pretty fine. Thanks for sharing your work!

I have got one final issue.

When I am on my laptop screen, the resolution is normal (1920X1080). However, when I go in clamshell mode, the resolution is a getting pretty strange (1920X1440). As you can guess, it makes all the content on the screen not render as it should.

Do you have any idea what could cause this?

Thanks a lot

[jkbuha]

Interesting, never saw a skewed display before. Could you describe how you switch to clamshell mode - is it Fn+F8 on the OpenCore menu? Also how is the laptop connected to an external display?

[GuiFlam]

Yes I go in clamshell mode by doing Fn+F8 on the Opencore menu.

the laptop is connected through a usbc cable into the external screen.

[jkbuha]

ah i've seen this before actually, it happens when I boot to external monitor without egpu.

i suspect it's got to do with the resolution you have on the opencore picker. i never got round to solving it as I didn't need to boot to external monitor. suggest you experiment with the displays on picker (remember your laptop display is 1920x1200 not 1920x1080, which itself is an issue. try forcing various display resolutions via opencore and see if you get any different results.

[GuiFlam]

Ok thanks.

where can I modify the display resolution?

[GuiFlam]

The thing is I don’t understand why the resolution on my external screen is wrong, but on my laptop screen it is fine?

[jkbuha]

your laptop screen is 1920x1200, whereas the monitor is 1920x1080, or else upscaled to 4k. Hence the distortion. Not sure if you can do this via OpenCore but you can definitely adjust in macOS with a specific display modifier app.