OK, I think I've found that it's not a kernel regression. however it should be a regression in the intel-microcode. In this submission[1] from one of affected machine, the kernel version is 6.8.0-60 and the intel-microcode version is 3.20250211.0ubuntu0.22.04.1. When I tried to reproduce the issue, I found that the 6.8.0-60 also hit the same issue, so I began investigating which package cause this. Following are the steps regarding how I found it's a intel-microcode regression. 1. Re-provisioning the system to the initial state. 2. sudo apt install linux-generic-hwe-22.04 to upgrade the kernel to 6.8.0-60 3. sudo rtcwake -m no -s 60;sudo systemctl suspend -> the system came back after 60 secs. 4. sudo apt install intel-microcode -> upgrade to 3.20250512.0ubuntu0.22.04.1 5. sudo rtcwake -m no -s 60;sudo systemctl suspend -> the system got stuck, after power cycling you can find the same message in journal log in bug descrption.
[1]https://certification.canonical.com/hardware/202209-30600/submission/425551/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2115854 Title: The system didn’t go into suspend and got stuck To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.8/+bug/2115854/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
