I can share my experience regarding this laptop and hunt for a stylus. I've run into dead-ends on the HP website regarding compatibility for my exact model. Wacom didn't list it either for any of their products. But this laptop supports Microsoft Ink, so I assumed one of Bamboo Styluses had to work because they claim to support ink as well. The Wacom Bamboo Ink Smart Stylus. 2nd generation, does work with this laptop, I did also learn for sure that this model laptop does not support tilt so i didn't get the ink plus.
The Bamboo Ink Smart Stylus supports 2 protocols: Wacom AES and WIndows MPP. I was hoping AES would work, but the Wacom software said the laptop wasn't supported so i couldn't use that protocol. After inserting the battery, it immediately connected to the laptop using WIndows MPP, but none of the buttons would work. From what i've read, they should provide default actions, like erase and back button, but nothing worked in apps i thought would support it.
Overall, the pen works well: draws straight lines consistently, and has all the functionality on the touchscreen you'd expect, but you can't use the buttons. I'm still looking for another stylus that give that functionality, but may end up keeping this one due to general lack of information.
I hope this helps someone.