How can I know what changes you made to your system “long back”?

I want to use intel hd drivers

Might well be wired to the NVIDIA dGPU, so you’d need that to be active in some way for the output to be active (whether that’s the nvidia or nouveau driver)

Whatever you changed broke it, so revert the change.

no I never used an external monitor on this laptop before

I had disabled nvidia as soon as I installed arch

Wow. You need to ask better questions. You said “if i add this nvidia-drm.nomodeset in grub, I cannot connect my laptop with hdmi to display?” which heavily implies that you made that change and then it broke.

thats already in my grub

I configured it long back

Might well be wired to the NVIDIA dGPU, so you’d need that to be active in some way for the output to be active (whether that’s the nvidia or nouveau driver)

I had blacklisted these here and added that line to grub

Again, why?

had some kernel panics/ freezing with nvidia

so someone here suggested to disable if I dont use

OK, so now you are wanting to use it, so you’ll have to enable it.

do you think there might be more files to revert or just these 2?

How can I know what changes you made to your system “long back” ?

Try those first, and see if it works.

nop doesn’t work

What doesn’t work?

external display is still black

After doing what?

sudo mv /etc/modprobe.d/blacklist.conf ~/

and removed this nomodeset

then grub-mkconfig

Were there any other files in there that were needed?

And reboot?

edited

yes

Have you configured the display to be active in your DE’s settings?

do i need to do mkinitcpio?

Probably not, but it won’t hurt anything if you do

Also make sure the monitor input is set to HDMI

kde display configuration is only showing laptop display

how do i increase the size of my swap partition without wiping my useful data from my pc?

when i run applications for a prolonged time they become unresponsive cuz i think my swap storage gets full