Comment 3 for bug 33855

According to 'drivers/acpi/pcc_acpi.c', the driver hasn't been updated since 2004, unfortunately, the current 'linux-source' tarball also seems to have corrupted timestamps on the files so it's not possible to rely on those either.

The last entry is about "combing the patches from XXX", who is the author the other patch about.

The affects of the new-driver suggested above seem to be to change the driver from sending ACPI HKEY events to adding an input driver and sending them via that.