Sudden heavy lag, loud fan noise (Envy X360)

[MatrixGod]

Envy X360 'Convertible' (upgraded HDD to SSD), Debian GNU/Linux 10, Ryzen 2500U w/ Radeon Vega 8 Mobile

This problem occured yesterday. Had this laptop since Febuary, its always been silent. The fan doesn't even turn on unless I start running a game or full HD Youtube/Netflix. Gnome (user interface) is lagging, even though video drivers have been installed long time ago and unchanged (didn't install any relevant updates). I check the system monitor (Linux's version of task manager), and no processes are using the CPU. I check temps, theyre at 38, way below what a fan at 100% should sound like. I resetted BIOS and explored different options (such as fan always on), and nothing has changed. I tried booting a different fresh OS, and same problems with lag and fan noise (yet no heavy processes or high temps). I have opened the laptop many times, to upgrade the SSD and change the network card. I keep it very clean, so dust cannot be the cause.

I am also doubting that its software because the fan noise is taken into BIOS and POST, and BIOS can even slightly stutter when opening menus. 

The laptop has an APU (Ryzen 2500U CPU and Radeon Vega 8).
Please don't take offence at the following: Don't tell me to cold boot the OS, or do something along the lines of 'System restore' or turning on power saving. As I have specified, the temperatures are not much above what they should be when idling, yet the fan sounds as if they are 90+. I have not changed anything software related since this summer, and this problem only occured recently. Nearly a month ago I last opened the computer (when changing the network card), and obsered no dust at all. It's been running Linux since day one just fine (apart from driver issues that I have since managed), and taking into consideration that this problem occurs prior to OS boot, I fear that this is a hardware issue.

This is my first post here, I'm not sure to treat it as Stack Exchange, or if its not entirely community based (if im not mistaken I saw some replies from HP representatives). I honestly don't know where to begin troubleshooting, since I have no clue what exactly the problem is. Nothing about the hardware or software has been changed in a long time to pinpoint the cause.

I appreciate feedback! My hope is that someone with this issue and a similar model might let me know how they solved their problem.

[WAWood]

@MatrixGod 

According to the HP website, your model PC came with Win10 Home preinstalled, not Linux.

I'm sorry, but we here are not equipped to provide detailed Linux support.

HP only warranties their PCs for usage with the OS that comes preinstalled. IF you replace that with Linux, or add a Linux OS, then you assume full responsibility for maintaining that -- as HP provides Linux assistance only on Redhat and then only to commercial customers.

The primary "challenge" to using Linux on any HP PC is the availability of Linux drivers. Any hardware that does not work will then range from simple (if there are Linux drivers available) to impossible (if there are NO Linux drivers available) to fix.

Since HP does not provide Linux drivers, your best bet for Linux support is to contact the support forum for the Linux distro you are using.

Folks on Linux support forums have experience using a variety of machines with Linux and know a lot about driver and installation issues. You will be able to get sound and detailed help there.

Good Luck

[MatrixGod]

As i said before, Linux is not causing the problem, and I have already found all appropriate drivers. The problem persists in BIOS setup, which is the motherboards firmware. It has nothing to do with what OS I have installed, or even if there is a harddrive present in the computer. I don't need HP to provide drivers (god that would be a disaster), since AMD/Realtek/Qualcomm have provided all the drivers I need for this laptop. I don't think there is any HP hardware inside the laptop to begin with.

As I mentioned this problem occured within the last two days (and I have not made any changes to the laptop). Before that, it has been running Linux for nearly a year perfectly fine. This leads me to believe that the problem is hardware related, which is why I posted this under the hardware section.