Public bug reported: I have a lenovo thinkpad E550 that has had kubuntu installed starting with 18.04, now updated to 20.04, I never had problems with wifi until last kernel update. If I boot with 5.4.0-33.37 the wireless connection acts normally, it's mostly stable and I have no major issues. If I boot with 5.4.0-37.41 there is a message like this and the wireless interface is not activated:
[ 16.227170] kernel: iwlwifi 0000:04:00.0: enabling device (0000 -> 0002) [ 16.227328] kernel: iwlwifi 0000:04:00.0: HW_REV=0xFFFFFFFF, PCI issues? [ 16.275802] kernel: iwlwifi: probe of 0000:04:00.0 failed with error -5 There are similar issue with previous releases, but none seem to have fixed the problem, some of the more informatives (apparently it's either a kernel issue fixed with kernel 5.6 or a firmware loaded incorrectly): - https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1867026 - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1865962 System specifications: System: Host: pc Kernel: 5.4.0-33-generic x86_64 bits: 64 Console: tty 0 Distro: Ubuntu 20.04 LTS (Focal Fossa) Machine: Type: Laptop System: LENOVO product: 20DF004USP v: ThinkPad E550 serial: --- Mobo: LENOVO model: 20DF004USP v: SDK0E50510 WIN serial: --- UEFI [Legacy]: LENOVO v: J5ET54WW (1.25 ) date: 07/18/2016 CPU: Topology: Dual Core model: Intel Core i7-5500U bits: 64 type: MT MCP L2 cache: 4096 KiB Speed: 798 MHz min/max: 500/3000 MHz Core speeds (MHz): 1: 798 2: 798 3: 798 4: 798 Network: Device-1: Intel Ethernet I218-V driver: e1000e IF: enp0s25 state: down mac: 68:f7:28:5f:d7:27 Device-2: Intel Wireless 3160 driver: iwlwifi IF: wlp4s0 state: up mac: d0:7e:35:84:92:57 IF-ID-1: lxcbr0 state: down mac: 00:16:3e:00:00:00 ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1884025 Title: iwlwifi not loading on kernel 5.4.0.37.40 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1884025/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
