All is the same 
mhwd shows that nonfree driver installed successfuly
and what exactly do you do? did you installed only optimus?
Yes, i’ve just open pamac gui and install it. That’s all 
and can you boot normally using wayland?
I should run
startplasma-wayland
And it starts and works correct. But my system looks bad in wayland, cause scaling nonnative for wayland apps is now works too bad.
By rhe way i can start gui, and xrabdr successfuly detects my screen
what kernels are you running:
mhwd-kernel -li
also provide logs:
journalctl -b0 -p4 --no-pager
boot with wayland and remove the optimus config that is in your home directory, check logs where exactly is it located
then reboot
It didn’t help
so run again startx
it will generate a log file in your home directory, so provide output from this log
i think this is the issue:
cannot run in framebuffer mode
try booting with the 5.10 kernel
if it doesnt work provide output from:
cat /var/log/Xorg.0.log
How can i switch kernel?
you have installed the 5.10 so select it in the grub menu under advanced options… do you have grub menu shown during boot?
No really …
there is something related to modesetting, but if thats whats causing the issue i have no idea…
post output from:
cat /var/log/Xorg.0.log
in reply highter i already posted it
it points to the modesetting drivers…
install this:
sudo mhwd -i pci video-modesetting
reboot