@edwardzhou
一种方法是通过改变cpu亲和性，绑定运行中的线程

[coolpi@localhost ~]$ taskset -h
Usage: taskset [options] [mask | cpu-list] [pid|cmd [args...]]


Show or change the CPU affinity of a process.

Options:
 -a, --all-tasks         operate on all the tasks (threads) for a given pid
 -p, --pid               operate on existing given pid
 -c, --cpu-list          display and specify cpus in list format
 -h, --help              display this help
 -V, --version           display version

The default behavior is to run a new command:
    taskset 03 sshd -b 1024
You can retrieve the mask of an existing task:
    taskset -p 700
Or set it:
    taskset -p 03 700
List format uses a comma-separated list instead of a mask:
    taskset -pc 0,3,7-11 700
Ranges in list format can take a stride argument:
    e.g. 0-31:2 is equivalent to mask 0x55555555

For more details see taskset(1).
[coolpi@localhost ~]$

@lymnxn

切换到root权限，参考如下操作，动态关闭4个核

echo 0 > /sys/devices/system/cpu/cpu0/online
echo 0 > /sys/devices/system/cpu/cpu5/online
echo 0 > /sys/devices/system/cpu/cpu6/online
echo 0 > /sys/devices/system/cpu/cpu7/online

@test 你的loader版本看起来比较早，升级loader试下。卡的分区表异常，格式化一次

@lymnxn 应该有方法。另一个思路，把你的应用绑定到大核上

@xingzhan2012 你先试下单独编译内核源码有没有问题，确认依赖环境补齐

@xingzhan2012 你在哪个主机环境编译

@edwardzhou 问题已复现。新建用户在logout之后的t登录界面（输密码窗口）位置，点击屏幕右下角，选择Ubuntu on Xorg，可以正常切换用户，firefox也能运行

@xingzhan2012 论坛上方github linux内核源码可以下载，修改相应名称的dts文件，编译替换

@xingzhan2012

5寸电容触摸屏切换操作参考，使用ubuntu 22.04 20230306版本

coolpi@coolpi:~/Desktop$ cat /boot/firmware/
Image                      cmdline.txt                extlinux/                  modules.tar.gz             rk3588s-cp4.dtb            
System Volume Information/ config.txt                 initrd.img                 rk3588s-cp4-dsi.dtb        vmlinuz                    
coolpi@coolpi:~/Desktop$ cat /boot/firmware/extlinux/extlinux.conf 
default Linux coolpi

label Linux coolpi
	kernel /Image
	initrd /initrd.img
	fdt    /rk3588s-cp4-dsi.dtb
	append root=LABEL=writable rw rootfstype=ext4 console=ttyS0,115200n81 quiet splash plymouth.ignore-serial-consoles vt.global_cursor_default=1 irqchip.gicv3_pseudo_nmi=0 net.ifnames=0
coolpi@coolpi:~/Desktop$

@xingzhan2012 有。在帖子最顶楼

@xingzhan2012

参考这个贴子
https://www.cool-pi.com/topic/136/coolpi-4b-python3-gpio-operation-compatable-with-raspberry-pi/1

@tonyone0902 其他系统也支持

@tonyone0902 微雪电子 5寸电容屏

@xingzhan2012 默认优先从tf卡启动，因为刷的是同一个镜像文件，需要你手动操作区分挂载的分区名称即可实现。

查看另外贴有描述

@xingzhan2012 断开蓝牙，播放网页视频是否流畅

@AugustRobot_Zou CPi.GPIO-1.0.0-cp36-cp36m-linux_aarch64.whl

@sushruth You can mount the second partition based on the image file we provided, back up the /lib/firmware, /lib/modules directories, and then empty the contents of that partition. Then extract the Fedora Server arm64 base file system to the second partition mount directory and restore the backup contents. Finally, write to the storage disk again, such as tf card, insert coolpi4b to start system verification.

Please refer to the github link above the forum to read the ubuntu repository shell script.

@MSUMMERS999 You can try boot system from emmc, and then insert tf card. Check it partitions table or format tf card. Please refer to the follow info.

coolpi@coolpi:~$ sudo wipefs /dev/sda
[sudo] password for coolpi: 
DEVICE OFFSET TYPE UUID LABEL
sda    0x1fe  dos       
coolpi@coolpi:~$ sudo wipefs /dev/sda1
DEVICE OFFSET TYPE UUID      LABEL
sda1   0x52   vfat A73D-13D2 system-boot
sda1   0x0    vfat A73D-13D2 system-boot
sda1   0x1fe  vfat A73D-13D2 system-boot
coolpi@coolpi:~$ sudo wipefs /dev/sda2
DEVICE OFFSET TYPE UUID                                 LABEL
sda2   0x438  ext4 460c3e2b-4363-4a7b-b9e2-1e1db123c52d writable
coolpi@coolpi:~$ 

format command example:

sudo wipefs -a -f /dev/sda

@allen
示例操作更改标识
sudo e2label /dev/mmcblk0p2 emmc-rootfs

@allen 可以在任意一个系统中在线配置，修改extlinux.conf参数，将label指向对应的rootfs分区即可。默认刷机镜像rootfs分区均为writable，可以自行设定不同标识。