this patch is not in -rc8, and might even be postponed to 2.6.28-rc1.
could you please uncomment "#define DEBUG" in the beginning of drivers/acpi/ec.c?
please also open bug report in bugzilla.kernel.org against ACPI and
attach dmesg from working and broken kernel with enabled DEBUG.
Let me know the number of bug report.
Thanks,
Alex.
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