GPEs get enabled at ACPI initialization. AcpiInstallGpeHandler() disables
GPEs using AcpiEvDisableGpe() w/o decrementing RuntimeCount.
So when acpiec(4) enables the GPE after installing the GPE Handler then
AcpiEnableGpe() does not call AcpiEvEnableGpe() because RuntimeCount
says it is already enabled which is wrong.
So decrement the RuntimeCount in AcpiInstallGpeHandler() right
before calling AcpiEvDisableGpe().
Selected changes between 20090730 and 20100121:
* A "post-order callback" was added to AcpiWalkNamespace().
* The ACPI_INTEGER type was removed and replaced with UINT64. Support for
this type remains (for the time being) for compatibility reasons.
* AcpiGetDevices() was optimized to not run extra _STA methods.
* Fixed possible mutex acquisition errors when running _REG methods.
* iASL was fixed not to fault when the maximum number of errors is
reached.
* Various miscellaneous fixes and improvements, including, for example,
improved object repair capabilities, memory leak fixes, better type
conversions, module-level code execution, etc.
cegger