Comment 39 for bug 191137

I've encountered lock when boot on battery only.

On Sun, Apr 13, 2008 at 8:56 PM, TJ <email address hidden> wrote:

> 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
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