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https://forums.lenovo.com/topic/findpost/1300/4398417/4398552 . Yup ... same exact issue with my T480.
I tried T480 with Acer monitor via HDMI-VGA cable, and worked fine. So there's no problem with the HDMI interface on T480. I tried a DELL desktop with the T24i_20 monitor via DP-DP cable, and worked fine. So the DP interface on the T24i_20 monitor …