If y change this,my pi don’t boot;
Can you help me
KMS does not get the correct info it needs from some monitors/tv’s to boot into a DE. Since RPi switched their PiOS to KMS they will no longer support FKMS and consider it depreciated. You have not given any info about what monitor/tv you are using but you might plug in the info with the screen resolution in a web search engine and see if some one has come up with a manual config to get it to boot. There are several ways people get their monitors working using KMS with different manual configs.
One thing you can try for a temp fix in the mean time is try to boot using llvmpipe as a renderer.
Install this package:
sudo pacman -S xf86-video-fbdev
Make some changes in /boot/config.txt. Add more memory and comment out any mention of kms or fkms:
gpu_mem=512
#dtoverlay=vc4-kms-v3d
Then reboot your pi.