@mario-ch Thank you so much for your reply!!

Hello,
I am a regular Ubuntu Touch user and recently i noticed a strange issue.
I use Ubuntu Touch on Pixel 2. I Use a Dell XPS laptop. Recently, I had my phone connected with my laptop through a usb cable, and my laptop was turned on and idle. On the phone i went to the Ubuntu Touch recovery, and i did factory reset. As soon as i did that my laptop screen went off. I was not even able to boot my laptop. Not even the boot screen would show up.
When i long pressed the power button, the keyboard would light up, but that's it, the system didn't boot. Screen was completely blank.
When i the Dell engineer analyzed it, they told me that the motherboard was not functioning/ it was faulty. They had to do a complete motherboard replacement (because in these laptops most of the components are a part of motherboard and cannot be independently repaired)

But I am clueless as to how such an issue might have occurred. Any ideas anyone??

@flohack Hello. I tried it out. The phone screen becomes the touch bar and I was able to control mouse with it. I connected a full mouse and keyboard with the USB port of my phone.
Mouse and key board: The phone touch screen controls worked fine. I did notice that I was not able to scroll webpages through either the touch screen or mouse wheel. I was able to scroll through my contact list perfectly fine.
The external keyboard did not work at all. (There is one usb receiver for both mouse and keyboard. This works fine on other devices, like my laptop)
I did notice that any audio does not go to the connected wireless display (My TV). I tried playing youtube videos and the audio was coming through my device while the video plays on the TV. Similar thing happens when i play music on the Music app. (Comparing it with my laptop, when i connect it to the TV the sound also transfers to the TV)
Another 'glitch' that seems to be there is that the TV display does a blink in every 5 to 10 seconds. Its like the display goes away for a fraction of a second and then comes back.(Doesnt happen when i connect laptop to the TV)
Battery drain. battery dropped by 7% in 10 minutes. But this is an old device and the battery health is anyways pretty bad. (Maybe someone else can check the battery performance)

@flohack How do I use/enable Aethercast? I updated to the build version 769. I looked for this option in the settings menu, but couldn't find it. I have a Samsung TV which supports Miracast.