![]() That said as soon as I connect a mini display port to display port cable for my third monitor it will ONLY display in 680x450 resolution. On my device I have a VGA connected to my main display, an HDMI>VGA adapter connected to HDMI port of dock and can run 2 monitors. We have tried several adapter combos and are in need of guidance. Not everyone has option 2 so we need to know how to make all three monitors work on both setup options.ĭell P2210 Monitors x3 max resolution 1680 x 1050 **(OPTION 1)ĭell P2417H Monitors x3 max resolution 1920 x 1080 **(OPTION 2) These are the two options we have for monitors. non USB DisplayLink) monitors to the dock.Our Service Desk environment is rolling out new devices. For example the Belkin Thunderbolt 3 Express Dock HD, although it will still only allow connecting 2 ordinary (i.e. I would recommend buying a dock that specifically supports your Mac. MST is required for this dock's "extended mode" to work even with just two monitors. ![]() In addition to this, your MacBook Pro does not support MST (multi-stream transport) via the USB-C cable you plug in. This seems to be a hardware limitation, and thus no driver changes or software hacks will ever allow you to run 3 independent displays. With a 3rd display connected via VGA that display will always be in "clone mode" (i.e. Note that TB15 was discontinued/recalled because of stability issues, and a newer product named TB16 is now available.ĭell does not support macOS for this product, so they do not express any guarantee that it is supposed to work with your MBP running macOS.ĭell writes on their support page (linked below) that the dock does not support 3 monitors in "extended mode" (i.e. Dell has a much similar product called TB15 which has Thunderbolt support. First off the dock actually does not have Thunderbolt as you write - it is instead a mini-DisplayPort connector.
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