我想知道为什么我的 WiFi 突然停止工作。我不知道出了什么问题。
我正在使用联想 L13 Intel i7 笔记本电脑，运行 ubuntu 20.04 和 Kde5。
一切都很顺利，直到几天前我意识到我无法连接到我常用的 WiFi。当我尝试选择一个已保存的 WiFi 连接时，弹出一个带有以下消息的弹出窗口：
Failed to get secrets for MIWIFI_aYEx
No agents were available for this request.
我发布了无线信息.txt，正如审查流程所建议的那样。
此外，我发现并阅读了以下相关问题，但我没有足够的知识来独自继续：
- https://bbs.archlinux.org/viewtopic.php?id=226683
- https://forum.manjaro.org/t/iwlwifi-on-kernel-5-8-broken/23417
因此，这里是调试所需的常见输出。
我的内核：
$ uname -r
5.8.0-48-generic
iwlwifi消息：
$ journalctl -k -p 4 | grep iwlwifi
abr 09 21:09:43 mgreco kernel: iwlwifi 0000:00:14.3: Direct firmware load for iwlwifi-QuZ-a0-jf-b0-56.ucode failed with error -2
abr 09 21:09:43 mgreco kernel: iwlwifi 0000:00:14.3: api flags index 2 larger than supported by driver
abr 09 21:09:43 mgreco kernel: iwlwifi 0000:00:14.3: Direct firmware load for iwl-debug-yoyo.bin failed with error -2
iwlwifi消息：
$ dmesg | egrep "iwlwifi"
[ 5.012141] iwlwifi 0000:00:14.3: enabling device (0000 -> 0002)
[ 5.022302] iwlwifi 0000:00:14.3: Direct firmware load for iwlwifi-QuZ-a0-jf-b0-56.ucode failed with error -2
[ 5.023653] iwlwifi 0000:00:14.3: api flags index 2 larger than supported by driver
[ 5.023663] iwlwifi 0000:00:14.3: TLV_FW_FSEQ_VERSION: FSEQ Version: 65.3.35.22
[ 5.023890] iwlwifi 0000:00:14.3: loaded firmware version 55.d9698065.0 QuZ-a0-jf-b0-55.ucode op_mode iwlmvm
[ 5.023912] iwlwifi 0000:00:14.3: Direct firmware load for iwl-debug-yoyo.bin failed with error -2
[ 5.066390] iwlwifi 0000:00:14.3: Detected Intel(R) Wireless-AC 9560 160MHz, REV=0x354
[ 5.227639] iwlwifi 0000:00:14.3: base HW address: 14:f6:d8:84:25:92
[ 5.245493] iwlwifi 0000:00:14.3 wlp0s20f3: renamed from wlan0
以下是固件列表：
$ modinfo iwlwifi | grep firmware
firmware: iwlwifi-100-5.ucode
firmware: iwlwifi-1000-5.ucode
firmware: iwlwifi-135-6.ucode
firmware: iwlwifi-105-6.ucode
firmware: iwlwifi-2030-6.ucode
firmware: iwlwifi-2000-6.ucode
firmware: iwlwifi-5150-2.ucode
firmware: iwlwifi-5000-5.ucode
firmware: iwlwifi-6000g2b-6.ucode
firmware: iwlwifi-6000g2a-6.ucode
firmware: iwlwifi-6050-5.ucode
firmware: iwlwifi-6000-6.ucode
firmware: iwlwifi-7265D-29.ucode
firmware: iwlwifi-7265-17.ucode
firmware: iwlwifi-3168-29.ucode
firmware: iwlwifi-3160-17.ucode
firmware: iwlwifi-7260-17.ucode
firmware: iwlwifi-8265-36.ucode
firmware: iwlwifi-8000C-36.ucode
firmware: iwlwifi-9260-th-b0-jf-b0-46.ucode
firmware: iwlwifi-9000-pu-b0-jf-b0-46.ucode
firmware: iwlwifi-SoSnj-a0-gf-a0-56.ucode
firmware: iwlwifi-SoSnj-a0-gf4-a0-56.ucode
firmware: iwlwifi-ty-a0-gf-a0-56.ucode
firmware: iwlwifi-so-a0-gf-a0-56.ucode
firmware: iwlwifi-so-a0-hr-b0-56.ucode
firmware: iwlwifi-so-a0-jf-b0-56.ucode
firmware: iwlwifi-cc-a0-56.ucode
firmware: iwlwifi-QuQnj-b0-jf-b0-56.ucode
firmware: iwlwifi-QuZ-a0-jf-b0-56.ucode
firmware: iwlwifi-QuZ-a0-hr-b0-56.ucode
firmware: iwlwifi-Qu-b0-jf-b0-56.ucode
firmware: iwlwifi-Qu-c0-hr-b0-56.ucode
firmware: iwlwifi-QuQnj-b0-hr-b0-56.ucode
firmware: iwlwifi-Qu-b0-hr-b0-56.ucode
parm: fw_restart:restart firmware in case of error (default true) (bool)
我读过linux-firmware可能遗漏的内容但事实并非如此：
$ LANG=c dpkg -s linux-firmware
Package: linux-firmware
Status: install ok installed
Priority: optional
Section: misc
Installed-Size: 545755
Maintainer: Ubuntu Kernel Team <[email protected]>
Architecture: all
Multi-Arch: foreign
Version: 1.187.10
Replaces: atmel-firmware, linux-firmware-snapdragon (<= 1.2-0ubuntu1), linux-restricted-common
Provides: atmel-firmware
Breaks: linux-firmware-raspi2 (<= 1.20190819-0ubuntu2), linux-firmware-snapdragon (<= 1.2-0ubuntu1)
Conflicts: atmel-firmware
Description: Firmware for Linux kernel drivers
This package provides firmware used by Linux kernel drivers.
这是我的iwlwifi.conf
$ cat /etc/modprobe.d/iwlwifi.conf
# /etc/modprobe.d/iwlwifi.conf
# iwlwifi will dyamically load either iwldvm or iwlmvm depending on the
# microcode file installed on the system. When removing iwlwifi, first
# remove the iwl?vm module and then iwlwifi.
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod) \
&& /sbin/modprobe -r mac80211
无线信息：
$ sudo lshw -class network
[sudo] password for mgreco:
*-network:0 DISABLED
description: Wireless interface
product: Wireless-AC 9462
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
logical name: wlp0s20f3
version: 00
serial: 14:f6:d8:84:25:92
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.8.0-48-generic firmware=55.d9698065.0 QuZ-a0-jf-b0-55.u latency=0 link=no multicast=yes wireless=IEEE 802.11
resources: irq:16 memory:71338000-7133bfff
*-network:1
description: Ethernet interface
product: Ethernet Connection (10) I219-V
vendor: Intel Corporation
physical id: 1f.6
bus info: pci@0000:00:1f.6
logical name: enp0s31f6
version: 00
serial: 48:2a:e3:86:99:f2
capacity: 1Gbit/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=3.2.6-k firmware=0.5-4 latency=0 link=no multicast=yes port=twisted pair
resources: irq:127 memory:71300000-7131ffff
*-network
description: Ethernet interface
physical id: 2
bus info: usb@2:1
logical name: enx3c18a054c684
serial: 3c:18:a0:54:c6:84
size: 100Mbit/s
capacity: 1Gbit/s
capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8152 driverversion=v1.11.11 duplex=full firmware=rtl8153a-3 v2 02/07/20 ip=192.168.31.205 link=yes multicast=yes port=MII speed=100Mbit/s
我的 PCI 无线网卡的详细信息：
$ lspci
00:00.0 Host bridge: Intel Corporation Device 9b61 (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation 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)
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model
00:12.0 Signal processing controller: Intel Corporation Comet Lake Thermal Subsytem
00:14.0 USB controller: Intel Corporation Device 02ed
00:14.2 RAM memory: Intel Corporation Device 02ef
00:14.3 Network controller: Intel Corporation Wireless-AC 9462
00:15.0 Serial bus controller [0c80]: Intel Corporation Serial IO I2C Host Controller
00:16.0 Communication controller: Intel Corporation Comet Lake Management Engine Interface
00:1d.0 PCI bridge: Intel Corporation Device 02b0 (rev f0)
00:1d.4 PCI bridge: Intel Corporation Device 02b4 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Device 0284
00:1f.3 Audio device: Intel Corporation Device 02c8
00:1f.4 SMBus: Intel Corporation Device 02a3
00:1f.5 Serial bus controller [0c80]: Intel Corporation Comet Lake SPI (flash) Controller
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (10) I219-V
03:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983
05:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01)
无线网卡未被屏蔽：
$ rfkill list all
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
固件：
$ dmesg | grep -i firmware
[ 0.291556] ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[ 1.174304] i915 0000:00:02.0: [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
[ 1.588418] psmouse serio1: elantech: assuming hardware version 4 (with firmware version 0x4f3001)
[ 5.022302] iwlwifi 0000:00:14.3: Direct firmware load for iwlwifi-QuZ-a0-jf-b0-56.ucode failed with error -2
[ 5.022386] elan_i2c 0-0015: Elan Touchpad: Module ID: 0x0033, Firmware: 0x0001, Sample: 0x0000, IAP: 0x0000
[ 5.023890] iwlwifi 0000:00:14.3: loaded firmware version 55.d9698065.0 QuZ-a0-jf-b0-55.ucode op_mode iwlmvm
[ 5.023912] iwlwifi 0000:00:14.3: Direct firmware load for iwl-debug-yoyo.bin failed with error -2
[ 5.166487] Bluetooth: hci0: Firmware revision 0.0 build 121 week 36 2020
欢迎任何帮助:-)
更新 1
回答guiverc问题：
几天前；你会定期更新吗？
是的，我经常更新软件包。
您是否尝试过之前的内核并且 wifi 可以正常工作？
我已经检查过了按照本指南概括来说，重新启动系统，选择“Ubuntu 高级选项”，然后选择内核（在我的情况下是 5.4）。
然而这没有修复 WiFi 连接。
您始终可以选择使用 GA 内核（即在 20.04 的生命周期内保留 5.4），但 grub 通常用于首先尝试使用较旧的已安装内核，以确保是内核更新导致了问题，或者是其他问题（例如配置问题等），而您没有提到诊断步骤。
谢谢，我在上面链接的问题中看到了如何做到这一点。
更新 2
我读这里快速启动可能会干扰我的 wifi 卡。我已检查是否已禁用此选项。