From: deloptes <delop...@gmail.com> > is the aarch64 bullseye kernel working on the RPI? > The buster does not work, so I copied the raspberrypi kernel and it works > fine.
Since I couldn't find an answer on the list, I write what I know. I use RPi4B 8GB. Plain upstream kernel became fully functioning from kernel version 5.8. Kernel version 5.9 was fine. 4K display output is also possible by hdmi_enable_4kp60=1 "config.txt". Gnome desktop environment works fine with 4K display. We can install Linux kernel 5.10 from buster-backports, which is the way to create images on raspi.debian.net for buster. Linux kernel 5.10 have several regressions: 1. Unless reset_raspberrypi.ko is loaded by initramfs, USB boot becomes impossible. 2. 5GHz WiFi is blocked by the newly introduced vc4.ko. 3. According to Diederik on the linux-rpi-kernel list, the audio functionality is also affected by vc4.ko. 4. My btrfs root filesystem becomes completely unmountable once every week... 2 and 3 can be worked around by module_blacklist=vc4 in the kernel comand line. Because of 4, I am using self-compiled upstreadm kernel 5.9.16... Another intel laptop also becomes very unstable with kernel 5.10, and I am staying away from 5.10. Best regards, Ryutaroh Matsumoto
