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February 6th, 2021 10:00
Trouble getting 3 external monitors working G5 5505
Greetings, I have a G5 5505 (All AMD 4800H and 5600M), I am trying to hook up 3 external monitors, I have one via the miniDP port, one via the HDMI, and one via USB-C hub with HDMI output, but I have run into an issue where I can only seem to hook up 2 external displays at once, it doesn't matter what arrangement I use to which monitor or from which port, anytime I try to plug in a 3rd it will come up as a weird small resolution but not actually work (the monitor will just blink saying its waiting for a signal).
Using the Windows 10 home install that came pre-installed from factory, everything is up to date.
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jphughan
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February 6th, 2021 10:00
@MatCat420 I can't speak with certainty about your specific model, but I know that on some Latitude models that have 3 types of display outputs, only 2 can be used at any given time because there are only 2 outputs coming from the GPU. One way you may be able to work around this would be to get an MST hub for either the USB-C port or the Mini-DisplayPort output. Both of those outputs use DisplayPort protocol, and DisplayPort is capable of running multiple independent displays from a single output, as long as the total bandwidth requirements of all connected displays don't exceed the bandwidth available from that output. You didn't specify the resolutions of your displays (and refresh rates of something other than 60 Hz), but for example you can run at least dual QHD 60 Hz displays from a USB-C or mDP output, or possibly even dual 4K 60 Hz if the source port and MST hub support DisplayPort 1.3 or better. Cable Matters and StarTech both make MST hubs that plug into USB-C or mDP outputs and provide 2-3 outputs.
MatCat420
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February 6th, 2021 10:00
I am using 2 that are 1920x1080 @ 60, and I have an ultrawide (2560?x1080) @ 60
jphughan
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February 6th, 2021 10:00
@MatCat420 One additional thought. I don't know this for sure since I haven't looked into the specs of the AMD hardware in your system, but I know that most Intel GPUs are limited to 3 simultaneous displays total. So if you want to run 3 external displays, you have to disable the built-in display before you can light up the third external display. So if you haven't already, try setting your built-in display to Disconnect in Windows Display Settings and see if that allows you to run the third external display.