With small tweaks almost everything (surprisingly touch, pen input and camera) works fine . Notable exceptions are resume from sleep and fingerprint.

While writing on this, power draw from battery (with terminal, vscode and chromium open) is between 6 and 10W. CPU temperature is ~50C and fans are off.

To quickly install the fixes presented here one could

sudo sh install.sh

And to uninstall them

sudo sh uninstall.sh

Out of the box keyboard works but Fn-Key and backlight do not.

Since 5.11 linux kernel support for Asus N-Key Keyboards but is missing usb device id. To install the patched hid-asus for Flow x13 run

#remove previous versions
sudo dkms remove hid-asus-flow-x13/1.0 --all
sudo dkms remove asus-flow-x13/1.0 --all
#install current version
sudo dkms install .

Integrated gpu requires linux firmware after 11.02.2021 (having "Green Sardine").

Nouveau drivers hangs laptop at boot. It can be blacklisted by appending nouveau.blacklist=1 to kernel command line or by following commands as root

echo "blacklist nouveau" >  /etc/modprobe.d/asus-flow-x13-nouveau.conf
echo "alias nouveau off" >> /etc/modprobe.d/asus-flow-x13-nouveau.conf

Even if nouveau or nvidia is not loaded nvidia gpu will still consume ~10W of power. We need to set power/control to auto to reduce power.

echo auto > /sys/devices/pci0000:00/0000:00:01.1/0000:01:00.0/power/control
echo '#nvidia dGPU' > /etc/udev/rules.d/99-asus-flow-power.rules
echo 'ACTION=="add", SUBSYSTEM=="pci", TEST=="power/control", ATTR{vendor}=="0x10de", ATTR{power/control}="auto"' >> /etc/udev/rules.d/99-asus-flow-power.rules
udevadm control --reload