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August 11th, 2022 01:00
Low resolution when connected second monitor
Latitude 5400
I have laptop DELL Latitude 5400 with Intel UHD Graphics 650. I am using via USB C dock DELL k20a001 to connect via DisplayPort my 27" Dell U2722D which is running 2560 x 1440 with no problems.
When I connect my second monitor 23.8" Dell U2417H to dock via DisplayPort I am not able to set full resolution on my first 27" monitor. I am not able to find 2560 x 1440 in resolution settings.
I tried every thing what I could find on internet - everything is up to date, I have reinstalled drivers several times.
Can you help me?
Thanks
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redxps630
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August 16th, 2022 08:00
It is not a driver issue but display port bandwidth. If you have HBR2 (HBR2 x2 lanes - 8.6 Gbps), it would not support 1440p in a two monitor setup.
https://www.dell.com/support/manuals/en-us/dell-wd19-130w-dock/wd19_userguide/display-resolution-table?guid=guid-5558fc88-5c31-4e2c-90be-42359855a1ae&lang=en-us
I think latitude 5400 has UHD620.
Dell Docking Station WD19•Regulatory Model K20A•Regulatory Type K20A001