[ltp] hotkey_mask on t40 with thinkpad-acpi 0.18-20071013

[Henrique de Moraes Holschuh]

On Mon, 05 Nov 2007, Jan Taegert wrote:
> The Fn-F[1-12] hotkeys work like a charme here (thinkpad t40 on
> debian sid, kernel 2.6.23 and thinkpad-acpi 0.18-20071013). Even without
> any polling, which saves me about 20 CPU wakeups (@ Henrique de Moraes
> Holschuh: thanks a lot for your good work!).

Any thinkpad T4x can have *full* complete hotkey support in ACPI event mode
(i.e. no polling) as long as you use the latest BIOS :)

And since the T42 BIOS is the same as the T40, T40 owners had a *real* sweet
deal on BIOS upgrades.  Nothing like what you get nowadays.

> Volume up/down/mute, brightness up/down, Thinklight and AccessIBM
> however are only working, when I set the hotkey_mask to 0x00ffffff
> (hotkey_all_mask), which is warned against on some place.

Why would you want to enable volume up/down and brightness up/down reporting
on a T4x?  The BIOS *always* handles them, no matter what you do, so they
always just work (or just break horribly :p).  

If it is for on-screen-display purposes, well, the proper solution for that
one is not on the kernel yet.  The improper solution is to use 0x00ffffff
for the mask and a HAL config that knows that volume up/down/mute and
brightness up/down from a T40 thinkpad are to be used only for
on-screen-display.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh