Precision 5540 HDMI behavior is inconsistent

Question

Hi, I have a Dell Precision 5540 that I connect to a 4k display via HDMI. First, I'd love to know how if it's possible to connect a display, keyboard/mouse, power while the lid is closed and have the laptop wake up. At the moment, I have to open the lid, log on, connect the display, and then close the lid to use an external display.  Second, if I open the lid and connect the display before I've logged in, the laptop screen always turn on and the external display is blue. And the laptop fan starts spinning. Sometimes, the external display will start working after 10 minutes. Sometimes, I need to force reset the laptop by holding down power for it to come back to life. But it never just works the way I'd expect it to (i.e. external display comes to life right away). If I connect the display after I've logged in, it usually works and then will be fine until the next time I disconnect/reconnect. I've updated BIOS and all drivers.  Any ideas? Thanks,Dan

DELL-Cares · Answer

We tried reaching you on a private message asking for the Service Tag number to ascertain the warranty but did not receive a response. Please feel free to reply to the private message whenever you are available.

DELL-Cares · Answer

Thank you! We have received the required details. We will work towards a resolution. In the meantime, you may also receive assistance or suggestions from the community members.

Precision Mobile Workstations

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