OP, Regarding using your laptop.
Research it, there is a lot of info out there. Monitor which device you use. I know there are more qualified people on this forum than me that would know and could explain the specifics .
You have to be careful using some adaptors bc they can overheat . You are using a 12v power source to run a 19v laptop. Be aware of heat build up on the adaptor device or the laptop itself.
Also, sometimes a flickering laptop screen will occur if the power supplied is not 'clean PSW power' as it is at home. That might depend on the particular laptop/adaptor circuitry.