Macbook Air no external display after 13.0.1 update - FIXED

[jpmbosco]

Hi All, I updated my M1 2020 MacBook air from MacOs 13.0 to 13.0.1 today and have been running a third party USBC dock with an external 27" HDMI Lenovo monitor with no prior issues. After the update, my MacBook refuses to recognise a monitor attached.
The Mac USBC hub is working as I can connect a memory card and an iPad and they are seen. I can use sidecar on the iPad OK. Anyone with the same issues?

 

[MrGimper]

I had this on ventura 13.0 on my unsupported iMac, and it was fixed after 13.0.1 was installed. Obviously doesn't help you other than letting you know someone else had the problem, albeit on an unsupported system. No amount of unplugging and replugging, rebooting etc helped at all.

There were issues with crashing if you had a custom colour profile in use... so maybe remove that if you have one on your external display. Lots of "maybe", but maybe it works

 

[jpmbosco]

I had this on ventura 13.0 on my unsupported iMac, and it was fixed after 13.0.1 was installed. Obviously doesn't help you other than letting you know someone else had the problem, albeit on an unsupported system. No amount of unplugging and replugging, rebooting etc helped at all.

There were issues with crashing if you had a custom colour profile in use... so maybe remove that if you have one on your external display. Lots of "maybe", but maybe it works

Thanks, my MacBook Air M1 2020 went to 13.0 with no issues at all, and all working fine, it was only the update to 13.0.1 that seemed to break the monitor. I have no custom profiles at all enabled. Thanks for commenting.

 

[jpmbosco]

Thanks MrGimper

Thanks, my MacBook Air M1 2020 went to 13.0 with no issues at all, and all working fine, it was only the update to 13.0.1 that seemed to break the monitor. I have no custom profiles at all enabled. Thanks for commenting.

Having thought about the comment you made about custom profiles for monitors, although I do not use custome profiles, I went to check in the MacBook Air built in display profile and it was set to LCD which it had been.
I changed the display to a generic RGB and restarted the Mac with no external monitor connected.
I then connected my external monitor and the MacBook discovered it straight away.
I then reset the Macbook display to LCD and the monitor is now detected OK.
Thanks for your suggestion as a change of screen profile seemed to fix it.