ubuntu蓝牙相关问题(ubuntu 18.04 + ax210)

装驱动（ax210的驱动好像要内核5.10以上能用，可以参考我之前的博客升级）

wget -c https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/snapshot/linux-firmware-main.tar.gz
tar -zxvf linux-firmware-main.tar.gz
cp iwlwifi-*.ucode /lib/firmware

然后reboot，wifi能正常使用但是蓝牙报错（开机自检界面）：Bluetooth: hci0: Failed to load Intel firmware file (-2)
蓝牙信息：sudo dmesg | grep Blue
wifi信息：sudo dmesg | grep iwl
然后网上查了查好像是intel固件问题
更新intel固件，下载网址：https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
找个最新版然后sudo cp -ax * /lib/firmware
然后reboot，蓝牙开机能正常使用，但是关闭后打不开

sudo systemctl status bluetooth.service

看下蓝牙状态，报错：Failed to set mode: Blocked through

sudo rfkill unblock bluetooth
sudo systemctl stop bluetooth
sudo systemctl status bluetooth
sudo systemctl restart bluetooth

解决

sudo apt-get install bluez* #安装蓝牙工具和包
aptitude
sudo rfkill block bluetooth