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5.15 kernel, DIsplay not work. no signal in display, but hdmi can show everything.

The README seems to leave out a few details for all the features beyond the display—for example, the Touch panel section doesn't mention that you need to copy the compiled .dts to /boot/overlays, and then sections beyond that should probably at least still mention that you need to "Add the following to /boot/config.txt", just to be explicit about it.

screen stay black after long time(>2h) sleep, through vnc the device can still be accessed.
still used 5.10, because rebuild of 5.15 not success.

I'm running the latest RetroPie image, and can successfully boot it, and when I do, the external HDMI display allows me to see everything, and I can SSH into the CutiePi.

But the internal display doesn't work by default. So I followed the steps in the README:

git clone https://github.com/cutiepi-io/cutiepi-drivers.git && cd cutiepi-drivers

# Build panel driver.
sudo apt install dkms raspberrypi-kernel-headers 
sudo tar xvf Display/panel-nwe080-1.0.tgz -C /usr/src/

sudo dkms add -m panel-nwe080 -v 1.0
sudo dkms build -m panel-nwe080 -v 1.0
sudo dkms install -m panel-nwe080 -v 1.0

# Compile DTS.
cd Display
dtc -I dts -O dtb -o panel-nwe080.dtbo panel-nwe080.dts

# Copy into overlays.
sudo cp panel-nwe080.dts /boot/overlays

# Edit config.txt.
sudo nano /boot/config.txt

And inside /boot/config.txt at the bottom I have added:

# MIPI DSI display
dtoverlay=panel-nwe080
gpio=12=op,dh

# Enable USB
dtoverlay=dwc2,dr_mode=host

I rebooted (and also power cycled) and the internal display still wouldn't come on. I didn't see anything in dmesg that was helpful in debugging:

dmesg | grep nwe080

And if I reboot with the normal CutiePi image, the display works fine, so I know it's not a hardware issue.

I'm wondering if I can get to the kernel source directory. How to build the module?

Can you tell me the installation steps in this section?

Hi,
I am new for dts.
There is something I don't understand.
in display dts line 25
reset-gpios = <&gpio 20 0>;
But the pin for reset in schematic is gpio6.
Is this an error?

My system informations:

Linux raspberrypi 5.10.17-v7l+ #1414 SMP Fri Apr 30 13:20:47 BST 2021 armv7l GNU/Linux
pi@raspberrypi:/usr/src $
pi@raspberrypi:/usr/src $ lsb_release -a
No LSB modules are available.
Distributor ID:	Raspbian
Description:	Raspbian GNU/Linux 10 (buster)
Release:	10
Codename:	buster

and when i start to compile the code, it shows:

/lib/modules/5.10.17-v7l+/build or /lib/modules/5.10.17-v7l+/source```