By installing an OLDER mainline kernel 5.3.18-050318-generic x86_64, the behaviour has reverted to what I had before Ubuntu 20.04, meaning: if the router switches the canal for the 5 Ghz band, connection is lost and then a new connection is set on the 2.4 Ghz band.
Interestingly, what can be seen in attachments in message #4 and #5 is happening too but is not reproduced endlessly, just a few attempts. ** Attachment added: "syslog (older kernel)" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1881214/+attachment/5382011/+files/syslog%20%28older%20kernel%29 -- 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/1881214 Title: Intel Wireless 8260 [8086:24f3] Subsystem [8086:1010] on channel switch, iwlwifi Microcode SW Error: FW error in SYNC CMD CHANNEL_SWITCH_TIME_EVENT_CMD Status in linux package in Ubuntu: Confirmed Bug description: Ubuntu Mate 20.04, with all supplied kernels up to 5.4.0.33 I occasionally see a message on my screen that disk space is low. I try rebooting since my computer is unresponsive. Normal reboot does not work, sudo reboot does not work. I have to power off the machine using power button. Machine boots but hangs because its trying to repair journal info. I can't see what causes that since I was not using my computer at the time. edit: see comment #14 So with a live session, I can see that syslog and kern.log files have grown to several GB until the drive is full. When using an upstream kernel 5.4.43-050443-generic x86_64, I haven't had any problem so far. edit: not true actually, this happened again using this upstream kernel. Never had this issue with previous Ubuntu versions with the very same hardware configuration, since 16.04. Included: partial syslog and kern.log with the same message repeated over and over. edit: and when the event starts. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1881214/+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