背景
最近把工作PC上的intel ax200网卡升级到了ax210，余留了一个旧的ax200网卡，索性废物利用把网卡移植到以前攒的X99平台上。
由于以前的X99平台fedora平台都是有线直连上网的，没想过重装操作系统后，会在网卡驱动上栽跟头。
具体表现为通过fedora的live镜像进入系统安装引导页面，能识别到无线网卡并且成功直连上了WIFI，但是进入新安装的机器后，发现机器找不到这张网卡。
root@x-cluster:~# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host noprefixroute
valid_lft forever preferred_lft forever
2: enp6s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
link/ether 00:e0:20:67:31:3e brd ff:ff:ff:ff:ff:ff
altname enx00e02067313e
使用nmcli进行网卡检查，发现同样的找不到对应的设备。
root@x-cluster:~# nmcli dev status
DEVICE TYPE STATE CONNECTION
lo loopback 连接（外部） lo
enp6s0 ethernet 不可用 --
root@x-cluster:~#
root@x-cluster:~# nmcli radio
WIFI-HW WIFI WWAN-HW WWAN
missing enabled missing enabled
查看PCI设备，发现是识别的。
root@x-cluster:~# lspci | grep -i network
03:00.0 Network controller: Intel Corporation Wi-Fi 6 AX200 (rev 1a)
查看硬件锁与软件锁信息，发现正常。
root@x-cluster:~# rfkill list all
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: wlan0: Wireless LAN
Soft blocked: no
Hard blocked: no
查看内核日志，发现报错。
root@x-cluster:~# dmesg | grep -E "iwlwifi|firmware"
[ 9.818321] iwlwifi 0000:03:00.0: Direct firmware load for iwlwifi-cc-a0-77.ucode failed with error -2
[ 9.818334] iwlwifi 0000:03:00.0: no suitable firmware found!
[ 10.081271] iwlwifi 0000:03:00.0: minimum version required: iwlwifi-cc-a0-77
[ 10.081274] iwlwifi 0000:03:00.0: maximum version supported: iwlwifi-cc-a0-77
[ 10.081276] iwlwifi 0000:03:00.0: check git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
[ 10.126781] iwlwifi 0000:03:00.0: Found device firmware: intel/ibt-20-1-3.sfi
[ 10.126789] iwlwifi 0000:03:00.0: Found device firmware: intel/ibt-20-1-3.sfi
[ 10.126801] Bluetooth: hci0: Waiting for firmware download to complete
root@x-cluster:~#
定位到问题为操作系统intel wireless固件加载失败，内核提示找不到iwlwifi-cc-a0-77.ucode微码文件，通过ls发现文件确实不存在。
解决方案
安卓手机通过USB共享网络的方式，连上机器后，进行iwl驱动的安装。
root@x-cluster:~# dnf install iwlwifi-mvm-firmware -y
重启电脑后，WIFI设备上线。查看内核日志，固件加载正常。
root@x-cluster:~# dmesg | grep -E "virtio|net|firmware"
[ 0.813924] Spectre V2 : Enabling Restricted Speculation for firmware calls
[ 0.885557] audit: initializing netlink subsys (disabled)
[ 1.259398] drop_monitor: Initializing network drop monitor service
[ 1.259519] Initializing XFRM netlink socket
[ 1.260263] can: controller area network core
[ 10.501250] SELinux: Permission firmware_load in class system not defined in policy.
[ 10.504391] SELinux: policy capability network_peer_controls=1
[ 10.504396] SELinux: policy capability always_check_network=0
[ 10.504403] SELinux: policy capability netlink_xperm=0
[ 10.504404] SELinux: policy capability netif_wildcard=0
[ 11.330889] systemd[1]: systemd-boot-clear-sysfail.service - Clear SysFail Entry If The Boot Is Successful skipped, unmet condition check ConditionPathExists=/sys/firmware/efi/efivars/LoaderEntrySysFail-4a67b082-0a4c-41cf-b6c7-440b29bb8c4f
[ 11.331081] systemd[1]: systemd-hibernate-clear.service - Clear Stale Hibernate Storage Info skipped, unmet condition check ConditionPathExists=/sys/firmware/efi/efivars/HibernateLocation-8cf2644b-4b0b-428f-9387-6d876050dc67
[ 11.336669] systemd[1]: Starting systemd-network-generator.service - Generate Network Units from Kernel Command Line...
[ 11.349831] systemd[1]: Finished systemd-network-generator.service - Generate Network Units from Kernel Command Line.
[ 12.224629] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[ 12.267584] Bluetooth: hci0: Found device firmware: intel/ibt-20-1-3.sfi
[ 12.274479] iwlwifi 0000:03:00.0: loaded firmware version 77.8dbafb52.0 cc-a0-77.ucode op_mode iwlmvm
[ 12.739212] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 14.125495] Bluetooth: hci0: Waiting for firmware download to complete
root@x-cluster:~#
事后思考确认问题触发的原因是安装的发行版本Fedora Server 默认不会打包大体积的无线微码驱动。