大家好，我碰到了一个头疼的问题，想请各位大佬帮忙排查一下：

之前我把/usr文件夹的权限改成了777，结果触发了sudo权限相关的错误，后来通过恢复模式把这个问题修复了，本来以为一切都正常了，结果新的麻烦又来了——我的笔记本连不上WiFi了，系统设置里直接显示“No Wifi Adapter found”。

我试着跟着网上找的一些教程操作，但都没什么效果。下面是我跑的一些诊断命令的输出，应该能帮到大家分析问题：

1. lshw -C network 输出 #

namle5@1-namle5-u:~$ lshw -C network

WARNING: you should run this program as super-user.

*-network DISABLED

description: Wireless interface

product: Comet Lake PCH-LP CNVi WiFi

vendor: Intel Corporation

physical id: 14.3

bus info: pci@0000:00:14.3

logical name: wlp0s20f3

version: 00

serial: 6c:6a:77:71:08:63

width: 64 bits

clock: 33MHz

capabilities: bus_master cap_list ethernet physical wireless

configuration: broadcast=yes driver=iwlwifi driverversion=5.15.0-58-generic firmware=66.f1c864e0.0 QuZ-a0-hr-b0-66.u latency=0 link=no multicast=yes wireless=IEEE 802.11

resources: irq:16 memory:f1210000-f1213fff

2. ethtool -i wlan0 | grep driver 输出 #

namle5@1-namle5-u:~$ ethtool -i wlan0 | grep driver

Cannot get driver information: No such device

3. ifconfig wlan0 up 输出 #

namle5@1-namle5-u:~$ ifconfig wlan0 up

wlan0: ERROR while getting interface flags: No such device

4. rfkill list 输出 #

namle5@1-namle5-u:~$ rfkill list

1: phy0: Wireless LAN

Soft blocked: no

Hard blocked: no

2: hci0: Bluetooth

Soft blocked: yes

Hard blocked: no

5. lspci | egrep -i 'intel' 输出 #

namle5@1-namle5-u:~$ lspci | egrep -i 'intel'

00:00.0 Host bridge: Intel Corporation Comet Lake-U v1 4c Host Bridge/DRAM Controller (rev 0c)

00:02.0 VGA compatible controller: Intel Corporation CometLake-U GT2 [UHD Graphics] (rev 02)

00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 0c)

00:12.0 Signal processing controller: Intel Corporation Comet Lake Thermal Subsytem

00:14.0 USB controller: Intel Corporation Comet Lake PCH-LP USB 3.1 xHCI Host Controller

00:14.2 RAM memory: Intel Corporation Comet Lake PCH-LP Shared SRAM

00:14.3 Network controller: Intel Corporation Comet Lake PCH-LP CNVi WiFi

00:14.5 SD Host controller: Intel Corporation Comet Lake PCH-LP SCS3

00:15.0 Serial bus controller: Intel Corporation Serial IO I2C Host Controller

00:16.0 Communication controller: Intel Corporation Comet Lake Management Engine Interface

00:17.0 SATA controller: Intel Corporation Comet Lake SATA AHCI Controller

00:1d.0 PCI bridge: Intel Corporation Comet Lake PCI Express Root Port #9 (rev f0)

00:1d.4 PCI bridge: Intel Corporation Comet Lake PCI Express Root Port #13 (rev f0)

00:1f.0 ISA bridge: Intel Corporation Comet Lake PCH-LP LPC Premium Controller/eSPI Controller

00:1f.3 Multimedia audio controller: Intel Corporation Comet Lake PCH-LP cAVS

00:1f.4 SMBus: Intel Corporation Comet Lake PCH-LP SMBus Host Controller

00:1f.5 Serial bus controller: Intel Corporation Comet Lake SPI (flash) Controller

6. lspci -vv -s 00:14.3 输出 #

namle5@1-namle5-u:~$ lspci -vv -s 00:14.3

00:14.3 Network controller: Intel Corporation Comet Lake PCH-LP CNVi WiFi

Subsystem: Intel Corporation Wi-Fi 6 AX201 160MHz

Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+

Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

Latency: 0

Interrupt: pin A routed to IRQ 16

Region 0: Memory at f1210000 (64-bit, non-prefetchable) [size=16K]

Capabilities: <access denied>

Kernel driver in use: iwlwifi

Kernel modules: iwlwifi, wl

7. lspci -knn | grep Net -A3; rfkill list 输出 #

namle5@1-namle5-u:~$ lspci -knn | grep Net -A3; rfkill list

00:14.3 Network controller [0280]: Intel Corporation Comet Lake PCH-LP CNVi WiFi [8086:02f0]

Subsystem: Intel Corporation Wi-Fi 6 AX201 160MHz [8086:0074]

Kernel driver in use: iwlwifi

Kernel modules: iwlwifi, wl

1: phy0: Wireless LAN

Soft blocked: no

Hard blocked: no

2: hci0: Bluetooth

Soft blocked: yes

Hard blocked: no

麻烦各位帮忙看看问题出在哪里，有没有可行的解决办法？非常感谢大家的帮助！

备注：内容来源于stack exchange，提问作者NAM