Comment 23 for bug 191137

Hi Everyone,

Just a few things to note here. First the upstream git commit id and description which seems to have resulted in the issue you are seeing is as follows:

commit c04209a7948b95e8c52084e8595e74e9428653d3
Author: Alexey Starikovskiy <email address hidden>
Date: Tue Jan 1 14:12:55 2008 -0500

    ACPI: EC: Enable boot EC before bus_scan

    Some _STA methods called during bus_scan() might require EC region handler,
    which might be enabled later in the scan.
    Enable it explicitly before scan to avoid errors.

    Reference: http://bugzilla.kernel.org/show_bug.cgi?id=9627

    Signed-off-by: Alexey Starikovskiy <email address hidden>
    Signed-off-by: Len Brown <email address hidden>

So it seems fixes for another upstream bug resulted in what you are seeing. I also noticed the following in the dmesg output from Vladimir:

[ 0.000000] ACPI: BIOS bug: multiple APIC/MADT found, using 0
[ 0.000000] ACPI: If "acpi_apic_instance=2" works better, notify <email address hidden>

Just curious if you tried acpi_apic_instance=2 without the patch applied and if it helps the situation.

Unfortunately the kernel is currently frozen for Hardy as we're approximately 2 weeks away from the final release. Obviously reverting this patch will cause issues for others :( I'll ping the Ubuntu kernel team to try and see what can be done but it may be the case that this won't get resolved until the Intrepid Ibex 8.10 kernel opens for development.

It would also be helpful if someone who has this issue could first test the current upstream kernel to verify the issue still exists upstream. See https://wiki.ubuntu.com/KernelTeam/GitKernelBuild for help with building the upstream kernel. If the issue still exists, if you could post a comment to the upstream bugzilla report (http://bugzilla.kernel.org/show_bug.cgi?id=9627) noting the regression the patch has caused and you've verified that removing the code (ie ifdef'ed it out) resolves the issue.

I apologize that this was overlooked until now. Apparently this report wasn't assigned to the right package (ie the Ubuntu kernel source package 'linux') and was being overlooked. It was recently reassigned to the appropriate 'linux' package. Just for future reference, https://wiki.ubuntu.com/Bugs/FindRightPackage can help with this. Thanks.