HP EliteBook 845 G8 constantly on and off when connected to LG Untrafile 5K display via type C

[Jeffrey8888]

This issue lasts for several years.

HP EliteBook 845 G8

LG Ultrafine 5K Display

https://www.lg.com/us/monitors/lg-27md5kl-b-5k-uhd-led-monitor

The display provides 94watt power charger to laptop through type-C cable, which is also used as display output.

The display keeps on and off when connected to the laptop.

When the display is on, the content is normal on the display.

There is no issue when a standalone power charger is connected to the laptop.

Same issue with HP EliteBook 840 G7.

There is no issue with Dell or Apple brand laptops.

I tried to open a case to HP support, the support guy request me to ship my display out of my country, and can't provide estimated days for issue investigation, which is unacceptable.

I am IT guy, I can do anything remotely to solve the issue.

[banhien]

@Jeffrey8888 

Its specs

           https://h20195.www2.hp.com/v2/GetPDF.aspx/c07003385.pdf

It has  2 SuperSpeed USB Type-C® 10Gbps signaling rate (USB Power Delivery, DisplayPort™ 1.4) ports .

>>>> There is no issue when a standalone power charger is connected to the laptop.

Sounds like the monitor itself does NOT have enough juice to drive its screen and charge the notebook at the same time.

Regards.

[Jeffrey8888]

@Banhien

Good day!

Thanks for the input.

The monitor provides 94 watt external power, while the standalone power charger is only 65 watt.

There should be some way to dig out low level logs to figure out the root cause.