On Thu, Feb 17, 2011 at 07:36:49PM +0000, Jukka Ruohonen wrote: > Log Message: > As explained in the new ACPICA documentation, as of ACPICA 20101207, the > _PRW methods are no longer automatically executed as part of the ACPICA > initialization. Refactor and rewrite the wake-device code to account this.
Despite of testing before the import, a regression still slipped through. The following change that affects acpiec(4) is the most plausible culprit: Re-introduced the support to enable multi-byte transfers for Embedded Controller (EC) operation regions. A reported problem was found to be a bug in the host OS, not in the multi-byte support. Previously, the maximum data size passed to the EC operation region handler was a single byte. There are often EC Fields larger than one byte that need to be transferred, and it is useful for the EC driver to lock these as a single transaction. This change enables single transfers larger than 8 bits. This effectively changes the access to the EC space from ByteAcc to AnyAcc, and will probably require changes to the host OS Embedded Controller driver to enable 16/32/64/256-bit transfers in addition to 8-bit transfers. Alexey Starikovskiy, Lin Ming. (ACPICA 20100806.) I don't have cycles to debug this any more today, but I will continue tomorrow. In the meanwhile, if someone has an idea about this, please feel free to join. - Jukka.
