OK, so this may be a high-priority issue for many notebook users.
According to [http://code.google.com/p/aceracpi/], acerhk is obsoleted in favor of acer_acpi, and acer_acpi is now obsoleted in favor of acer_wmi. The latter does not support a broad range of hardware, some of which _were_ supported by acerhk. If nothing relevant changed in the kernel substantially, the task is just to port the acerhk functionality to the new module.
OK, so this may be a high-priority issue for many notebook users.
According to [http:// code.google. com/p/aceracpi/], acerhk is obsoleted in favor of acer_acpi, and acer_acpi is now obsoleted in favor of acer_wmi. The latter does not support a broad range of hardware, some of which _were_ supported by acerhk. If nothing relevant changed in the kernel substantially, the task is just to port the acerhk functionality to the new module.
Some relevant info on acer_wmi: http:// lxr.linux. no/linux+ v2.6.31/ Documentation/ laptops/ acer-wmi. txt
I have written a mail to the current (?) acer-wmi maintainer, Carlos Corbacho, to find out what is the current situation.