New best workaround, instead of blacklisting i2c-i801 keep it but disable interrupts and use polling instead.
Step 1 Temporary and to be able to boot for step 2). a. To able to boot enter the grub menu (press ESC once during boot) b. select the (Ubuntu)Linux entry you want to boot and press "e" to edit this. c. edit the line start with " linux /boot/vmlinuz ....." d. at the end of this line add " i2c-i801.disable_features=0x10" e. press F10 Now the machine will boot with this new i2c-i801 module parameter. This will happen only once, next boot will be without this parameter (unless you manually add it again by repeating the above steps). Step 2 After the boot and login, make it last: a. Run "sudo vi /etc/modprobe.d/i2c-i801.conf" b. Add the line "options i2c-i801 disable_features=0x10" c To make sure its used at boot-time run: "sudo update-initramfs -u" With this best workaround the module i2c-i801 is still loaded but using polling instead of interrupts. I think this is better then no i2c-i801 at all. I can boot, the issue does not occur. Still a workaround .. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-hwe-5.11 in Ubuntu. https://bugs.launchpad.net/bugs/1931001 Title: kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 22s! Status in linux-hwe-5.11 package in Ubuntu: Confirmed Status in Fedora: Confirmed Bug description: Ubuntu 20.04 LTS and Ubuntu 21.04 occasionally boots with very bad performance and very unresponsive to user input on Lenovo laptop Lenovo 300e 2nd Gen 81M9 (LENOVO_MT_81M9_BU_idea_FM_300e 2nd G). When this happens you can read this kind of messages on journal: --- root@alumne-1-58:~# journalctl | grep "BUG: soft" may 20 21:44:35 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 22s! [swapper/3:0] may 20 21:44:35 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 22s! [swapper/3:0] may 22 09:33:34 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:0] may 24 16:45:14 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [prometheus-node:4220] may 24 16:45:14 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:0] jun 03 00:01:09 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:0] jun 03 00:01:09 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [swapper/0:0] jun 03 00:01:09 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [swapper/1:0] jun 03 00:01:09 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [swapper/0:0] jun 03 00:02:15 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#0 stuck for 21s! [swapper/0:0] jun 05 08:22:58 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 22s! [irq/138-iwlwifi:1044] jun 05 08:25:06 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [swapper/2:0] jun 05 08:25:06 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 22s! [irq/138-iwlwifi:1044] jun 05 08:26:42 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [lxd:3975] jun 05 08:26:42 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#2 stuck for 23s! [swapper/2:0] jun 05 08:26:42 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 23s! [irq/138-iwlwifi:1044] jun 05 08:27:38 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 23s! [irq/138-iwlwifi:1044] jun 05 08:28:34 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 22s! [irq/138-iwlwifi:1044] jun 05 08:29:46 alumne-1-58 kernel: watchdog: BUG: soft lockup - CPU#3 stuck for 22s! [irq/138-iwlwifi:1044] root@alumne-1-58:~# --- Usually if you reboot everything works fine but it's very annoying when happens. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.11/+bug/1931001/+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
