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Thank you for your reply

Indeed, it's these buttons in particular that I was talking about.

I didn't know if there were others involved, as I haven't tested many of them.
If it's only these two that are hard-coded, I don't think it's a big deal.

royka wrote:

Besides patching you should still choose full realtime in the config. After entering "make menuconfig" => General setup => Preemption Model => Fully preemptible kernel

Here are the rt config settings that works best for the rk3588:
github.com/orangepi-xunlong/linux-orange...s/rockchip_rt.config
 

Thnks, I've done all that but didnt work. I chose fully preemptible kernel.
my problem is after compilation, and after installing the deb file of rt compiled kernel, the kernel doesn't switch to the rt one and still boot with the old kernel. and also I manually changed the boot.cmd file in the boot directory, after doing this the kernel doesnt boot up at all and just stuck in that stage.
by the way, my orange pi 4 lts has rk3399 not rk3588.

tommylight wrote:

Nope, not RT, should have RT in the name there.
Run latency-test or latency-histogram , just in case.
 

Yes, I know. I couldnt switch to the rt kernel yet.

Here's the one I use. It's a Travel Distance & Lube component. Rather than time based. 

That way you can leave the machine idle for a day and the oil jar won't empty itself in your coolant reservoir.

e.g. at every 3000mm travel in the Z, lube for 2 seconds. 

Must have (imho)