Václav, your result is interesting, thank you. I didn't have time to endlessly repeat the reboot tests when I did the DSDT patch so it is possible that it was in some way coincidental that the kernel didn't crash those times.
Since doing that patch and having time to think about things more I'm leaning towards the idea that the power management hardware is generating the unhandled event when it sees the AC adapter is connected - not the EC._REG() method because of early init. If this 'new' theory is correct, then when the EC GPE events are enabled early the hardware can start interrupting. The problem is, as soon as I add even minimal debug messages to try and trace the code-path the bug goes away - the same as when removing the "quiet" kernel boot option! -- [Hardy] ACPI Embedded Controller (EC) stops boot when kernel boot 'quiet' option is enabled https://bugs.launchpad.net/bugs/191137 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
