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Problem with display

fcummins
fcummins asked
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Last Modified: 2020-06-23
I am setting up a new office for our President/CEO.  He will be using his Lenovo ThinkPad T480s with the Lenovo ThinkPad Ultra Docking Station and three Lenovo P24q monitors.  The dock has 2 DisplayPort 1.4 ports and 1 HDMI 2.0 port.  The monitors all have mini-DP, DP and HDMI.

When we connect from the dock to the monitors via two DP and one HDMI, two of the monitors work at the full recommended 2560x1440 but the 3rd only uses 1920x1200.  I tried two different hubs - a DP > 3 HDMI and DP > 3 DP - to see if that would resolve but I got the same results.

It has been a long time since I've messed around with more than 2 displays - especially when using a laptop.  What am I doing wrong here?

Thoughts?

Thanks.
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Hello ThereSystem Administrator
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Distinguished Expert 2018

Commented:
Is it possible that the third monitor supports only 1920x1200?

Author

Commented:
Hi.  They are all identical monitors.  Swapping the cords moves the 1920x1200 to a different monitor allows the original 1920x1200 to use 2560x1440.


Robert RComputer Service Technician
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Commented:
I have run into a similar problem with a dell laptop connected through a docking station, they way it was resolved I installed a firmware update for the docking station. Maybe there is a firmware update for the docking station or maybe update the firmware to the laptop itself, finally I would check to see if there is an update for the video drivers. 

Author

Commented:
Thanks.  I was hoping it was that but I've run all the latest Windows and Lenovo updates with no success.  I attempted to change the refresh rate to see if that would help but that only exacerbated the issue.

Appreciate the suggestion.
byundtMechanical Engineer
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Commented:
You appear to be mirroring the laptop screen with its 1920 x 1200 resolution, and running the DisplayPort 1.4 and 2.0 ports each at 2560 x 1440.

The specs I found for the docking station say that it supports two 4K external monitors or three 1080p monitors. The specs I found for the T480s laptop were silent on how many external monitors could be supported.

You may also be running into a hardware limitation of the Intel UHD 620 graphics chip used in the T480s. It may not be capable of driving three P24q monitors running at full resolution. If so, changing drivers won't help. You need better hardware. The new MacBook Pro 16" supports up to four 4K external monitors, for example.

I think you need to get with Lenovo sales/tech support to make sure the laptop and docking station will meet your CEO's needs. An upgrade may be in order.

Author

Commented:
Thanks, byundt.  I'm already ahead of you with reaching out to Lenovo.  I suspect I'm pushing against a hardware limitation and the user will either have to deal with it or I'll build a workstation for them that will have the resources to drive the 3 monitors.
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This one is on us!
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