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HP Pavilion 15 on Linux - Intel GPU [Optimus Laptop] unable to detect external monitor

HP Recommended
Pavilion 15 dk-0047TX
Linux

Hello, I am using the HP Pavilion 15 dk-0047TX Laptop and the serial number is [edit]. The laptop is a Hybrid Graphics laptop - it has both an Nvidia graphics card and an Intel integrated Graphics Card. I had Windows installed, but I have removed it and installed Linux. I'm not sure how it was on Windows, but ever since I've switched to Linux, it seems that the HDMI port is hardwired to the Nvidia graphics card.
I use an external monitor, and using the Nvidia GPU is really draining the battery - it lasts for less than 2 hours! However, when I switch to the Intel graphics card, it doesn't even detect the monitor. At first, I thought this was a Linux problem, but then I read that a lot of gaming laptops have this feature where the primary display output port is hardwired to use the dedicated graphics card.
I since bought a USB Type-C to HDMI cable, hoping that the Intel GPU would detect my monitor this time - but it didn't. I have no idea what's going on and I'm very sure that this isn't a problem with Linux.
As for how it was on Windows, I have no idea - I didn't notice. My guess is that it was more or less the same, since the Intel GPU couldn't detect the HDMI output on Linux.

What would be the solution - if there is any? Because, at this rate, the battery is deteriorating quite quickly and I don't want it to reach a point where my laptop is useless without the charger.

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