Question: Q: MacBook Pro 13″ M1 Dual Monitors using Dell D6000



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Grant Bennet-Alder


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Dec 1, 2020 7:04 AM in response to RRGT19


In response to RRGT19


The Apple-Silicon M1 Macs have one display-generator/rasterizer for the Built-in display, and ONE for an external display, which can be as large as the Apple 6K displays. You can not attach two hardware-accelerated displays.

Dec 1, 2020 7:04 AM

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Grant Bennet-Alder


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Dec 1, 2020 7:05 AM in response to Grant Bennet-Alder


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DisplayLink technology creates a “fake” display buffer in RAM, sends the data out over a slower interface to a stunt box with DisplayLink custom chips that put that data back onto a “legacy” interface. It is not a true “accelerated” display, and it suffers from lagging.

It may be acceptable for a second display showing slow-to-change data such as computer program listings, stock quotes, or spreadsheets, but NOT for full motion Video, and mouse-tracking on that display can lag, and can make you feel queasy.

——–

It is really nice to know that you can use a DisplayLink display if you MUST have an additional display for some of the types of data I mentioned. But that is NOT the same as the computer supporting a second, built-in, accelerated display.

These displays depend on DisplayLink software, and are at the whim of Apple when they make MacOS changes. There have been cases where MacOS changes completely Borked DisplayLink software, and it took some time for them to recover.

——–

I think the Big Surprise for a lot of Hub/Dock buyers is that they thought they were getting a “real” display, but actually got a DisplayLink “fake” Display. If you got what you expected in every case, I would not use such strong terms to describe DisplayLink.

Dec 1, 2020 7:05 AM

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Dec 8, 2020 11:39 AM in response to keremfromlondon


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Actually the Displaylink performance on an M1 MacBook Pro is very good and using a dock such as the HP Universal USB-C G2 dock (5TW13UT), I have 2 external 27″ Acer Predator monitors at 1440P plus the built in display active in extended desktop mode. The fast performance might be due to the unified memory architecture and will probably get better since the displaylink drivers haven’t been optimized for the M1 chip yet (the are coded for Intel arch as far as I know). There are currently 3 issues though:

1). Clamshell mode needs to implemented, currently its all displays active or none while using Displaylink in extended desktop mode

2). HDCP/DRM needs to be implemented. While displaylink app is active, video from the Apple TV app only shows as a black screen. This happens on all displays while displaylink is active

3). unlock with Apple Watch does not currently work, since the OS thinks the screen is being recorded.

In all it’s a good solution for an M1 but obviously it needs refinement/improvement. When I say good, I mean good for standard productivity, non DRM movie watching, etc. Obviously, gaming of any sort is a different beast and not sure how that would perform with this type of setup but suspect it would have issues with gaming.

Dec 8, 2020 11:39 AM

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Dec 20, 2020 3:49 PM in response to tmoldovan


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On my M1 MBA, the HP Thunderbolt G2 (2UK37AA) did not seem to work.

However, the (old) USB-C Universal Dock (1MK33AA) seems to be doing the trick.

Am not sure if the firmware on the docks needs to be upgraded.

I would like to see some more data on these docks, as I do like them, in general.

Dec 20, 2020 3:49 PM

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RRGT19


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Dec 23, 2020 5:50 AM in response to Oliver Jobson


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I haven’t tried the new Displaylink drivers because I don’t have a laptop with M1 yet. I asked to know if it will work before placing my purchase. I think I will wait a few more months before doing the switch, I hope that at that time a lot of things will be fixed.

Dec 23, 2020 5:50 AM

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Dec 23, 2020 6:06 AM in response to RRGT19


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Thanks for your reply. I have done some digging and I found a macrumors thread where someone has confirmed that the D6000 works to support a total of two external displays on their M1 macbook. This was before the new drivers came out, so hopefully the performance will be better too.

Link to thread:

https://forums.macrumors.com/threads/external-monitor-support.2266844/page-10

Dec 23, 2020 6:06 AM

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Dec 23, 2020 6:04 PM in response to tmoldovan


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Hi tmoldovan,

The dock has to be the HP Universal USB-C G2 displaylink dock, the part number is in my original post (P/N: 5TW13UT). This is not the same as the thunderbolt dock G2. The thunderbolt dock is a different technology and does not support displaylink, I know it’s confusing since the USB-C and thunderbolt 3 connectors are physically the same. The displaylink dock also has specialized hardware/logic for video compression over USB-C (this is part of the displaylink solution along with Displaylink’s driver software for MacOS/Windows). Also note that the HP USB-C G5 dock (5TW10AA) is not a displaylink dock either…it does not have the Displaylink chipset and thus will not work either.

Dec 23, 2020 6:04 PM

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Dec 24, 2020 11:29 AM in response to Oliver Jobson


In response to Oliver Jobson


P/N: 5TW13UT is the HP Displaylink Universal USB-C G2 dock I am using with my M1 Macbook Pro and yes it does work. I haven’t had a chance to try out the December release of the Displaylink drivers yet to answer one of the previous posts. Links to the dock info and compatibility below:

https://www.displaylink.com/products/find?res=3840×2160&num=2&br=5&vid_dp=1&usbc=1

https://store.hp.com/us/en/pdp/hp-usb-c-a-universal-dock-g2

Dec 24, 2020 11:29 AM

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