I have the same problem with Dell Latitude E7440, Ubuntu 20.04, after an update to kernel 5.4.0-92, and having linux-firmware 1.187.24.
1) I'm using a UGreen USB Switch to switch between the inputs of keyboard, mouse and audio between two stations 2) After the kernel and linux-firmware upgrade I did a reboot, the system took much longer to start (console shown "failed to enumerate USB devices"), when it did boot external keyboards and mouse wasn't working 3) Pluging in any device directly to laptop's USB port does not work 4) I've managed to get the external keyboard and mouse to work by disabling the Bluetooth in Ubuntu settings and rebooting back to 5.4.0-91 (worked via USB Switch) 5) However after another reboot to 5.4.0-91, USB ports stopped working again -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-firmware in Ubuntu. https://bugs.launchpad.net/bugs/1956518 Title: linux-firmware 1.187.24 may crash USB ports Status in linux-firmware package in Ubuntu: Confirmed Bug description: Description: Ubuntu 20.04.3 LTS Release: 20.04 5.4.0-92-generic linux-firmware: Instalados: 1.187.24 Candidato: 1.187.24 Tabla de versión: *** 1.187.24 500 500 http://es.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages 500 http://es.archive.ubuntu.com/ubuntu focal-updates/main i386 Packages 100 /var/lib/dpkg/status 1.187 500 500 http://es.archive.ubuntu.com/ubuntu focal/main amd64 Packages 500 http://es.archive.ubuntu.com/ubuntu focal/main i386 Packages linux-firmware 1.187.24 upgrade disabled all mainboard USB ports. USB keyboard and mouse stopped working on the next reboot after upgrade. I disconnected an USB bluetooth key from a back USB port, rebooted, and everything restored to normality. My personal conclusion: there is a bug in the bluetooth firmware update that may cause a general USB crash when an USB bluetooth key is connected. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1956518/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
