Manufacturer support page:
http://support.hp.com/us-en/product/HP-Pavilion-17-Notebook-PC-series/8499304/model/9629691/manuals
That documentation (http://h10032.www1.hp.com/ctg/Manual/c04825537 more
precisely) made me lie in
https://trisquel.info/forum/how-can-i-check-compatibility-purchasing-new-computer#comment-87685
Indeed, four WLAN chipsets are listed in the "WLAN module" section... and I
am pretty sure none of them cannot be driven in freedom.
The graphical chipset (Intel HD Graphics 4400) will perfectly work. The
Intel® Core™ i5-4210U Processor has neither vPro nor Trusted Execution
Technology, which is good:
http://ark.intel.com/products/81016/Intel-Core-i5-4210U-Processor-3M-Cache-up-to-2_70-GHz
So, basically, you will only need to acquire a Wifi adapter. Typically from
http://libre.thinkpenguin.com or http://tehnoetic.com (both ship
internationally), the only two vendors that guarantee that their hardware
perfectly work with Linux-libre, hence Trisquel.