Additional information with kaihengfeng's comment. dmesg shows wifi stops working after suspend and resume. wifi driver also tried to restart hardware but failed:
[ 459.548998] e1000e: enp0s25 NIC Link is Down [ 461.601935] iwlwifi 0000:03:00.0: Error sending REPLY_SCAN_ABORT_CMD: time out after 2000ms. ... [ 461.865575] ieee80211 phy0: Hardware restart was requested ... [ 467.757292] Hardware became unavailable during restart. If this is the case, please try to re-initialize wifi driver by "sudo modprobe -r iwlwifi; sudo modprobe iwlwifi". -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1891130 Title: unable to connect to wifi Status in linux package in Ubuntu: Confirmed Bug description: My ThinkPad T430 ran very good with no issues on 1804 lts. After upgrading it is not connecting to wifi. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-42-generic 5.4.0-42.46 ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44 Uname: Linux 5.4.0-42-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.6 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: naman 1446 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Tue Aug 11 11:59:57 2020 InstallationDate: Installed on 2020-06-21 (50 days ago) InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805) MachineType: LENOVO 23501E3 ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-42-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-42-generic N/A linux-backports-modules-5.4.0-42-generic N/A linux-firmware 1.187.2 SourcePackage: linux UpgradeStatus: Upgraded to focal on 2020-08-02 (8 days ago) dmi.bios.date: 03/08/2013 dmi.bios.vendor: LENOVO dmi.bios.version: G1ET93WW (2.53 ) dmi.board.asset.tag: Not Available dmi.board.name: 23501E3 dmi.board.vendor: LENOVO dmi.board.version: Win8 Pro DPK TPG dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvrG1ET93WW(2.53):bd03/08/2013:svnLENOVO:pn23501E3:pvrThinkPadT430:rvnLENOVO:rn23501E3:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.family: ThinkPad T430 dmi.product.name: 23501E3 dmi.product.sku: LENOVO_MT_2350 dmi.product.version: ThinkPad T430 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891130/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
