Macbook Air M1 & Multiple External Displays

 I saw several folks on Reddit complaining that the new M2 Macbook Air only supports one external monitor.  Technical specifications state that one 6K display is supported but I saw several posts over the past 30 days stating folks have been using multiple external displays with the M1 Mac Minis, which uses the exact same SoC as the M1 Macbook Air.

I decided to check with my Mac Mini M1to see what it would handle and if it could see more than one external monitor.

My Mac Mini is currently connected to an iMac 27" Late 2009 using a Thunderbolt-to-miniDisplayPort cable.  I switch between it and the iMac using Target Display Mode, which I posted about a few weeks ago.  My gaming PC uses a Samsung 34" UltraWQHD screen.  I disconnected it from my gaming PC and connected the display to the Mac Mini using and HDMI-to-HDMI cable, connecting it to the Mini's HDMI port.  The result is that the Mini is able to use both screens without issue, with both rendering in  1440p.

I then attempted to use the same two displays with my MBA M1.  Since the MBA M1 only has the two TB ports on the left side of the system, I had to use my Anker hub, which has an HDMI port.  I found that the MBA M1 can only use one of the two 1440p displays at a time, not both at the same time.  I did not alter the resolution.  NOTE - since the MBA only allows the usage of one external display, using a hub isn't necessary; you can use the aforementioned Thunderbolt-to-miniDisplayPort cable, which will give you the option of 1440p with the 27" iMac.

I think that two 4k monitors is a too much for the bandwidth of the MBA M1 and I've seen articles mentioning that two 4K displays was too much.  I need to test to determine if it'll detect both displays if one is not 4K or if I have to lower the resolution on both for them to be detected.

There are solutions that will allow the usage of multiple displays with the MBA M1, but you've to install DisplayLink.  I haven't tried that yet.

To be honest, the 34" as an external (or second) display is extremely large...it's like having two screens when in 1440p.  That's actually quite enough space for me, but I'll make it a project of trying to get the two 1440p displays to work with the MBA M1.