Observing this ESD effect when using HDMI cable instead of DisplayPort
I'm observing this ESD effect on my display as well. I have an external display from Dell and a recently acquired gas cylinder chair with cushioned seat from IKEA. Quickly getting up from the chair causes an audible electrostatic discharge, and if my laptop is connected to the display via HDMI cable, the screen will go blank for a second, without me having to touch any parts of the computer equipment. I can prevent the ESD by keeping one hand on the fabric of the seat while getting up. I also noticed that I can prevent an ESD in the chair from affecting my display by connecting the devices with my USB-C DisplayPort cable instead of my HDMI cable. I don't know whether my DisplayPort cable happens to have better electric shielding or whether the electrical specification of DisplayPort makes it inherently more resilient.