| commit | f97fc53367481a078410d23410226e1c8f349436 | |
| author | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | |
| Tue, 24 Apr 2007 03:40:26 +0000 (24 00:40 -0300) | ||
| committer | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | |
| Sun, 9 Sep 2007 02:14:58 +0000 (8 23:14 -0300) | ||
| tree | 645d57a17fa123a03a0c789078d5d99acf36c02e | treesnapshot (tar.gz zip) |
| parent | e66db7164728d72dd8310f170a2113cbbe02840c | commitdiff |
ACPI: thinkpad-acpi: add a safety net for TPEC fan control mode
The Linux ThinkPad community is not positive that all ThinkPads that do
HFSP EC fan control do implement full-speed and auto modes, some of the
earlier ones supporting HFSP might not.
If the EC ignores the AUTO or FULL-SPEED bits, it will pay attention to the
lower three bits that set the fan level. And as thinkpad-acpi was leaving
these set to zero, it would stop(!) the fan, which is Not A Good Thing.
So, as a safety net, we now make sure to also set the fan level part of the
HFSP register to speed 7 for full-speed, and a minimum of speed 4 for auto
mode.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
The Linux ThinkPad community is not positive that all ThinkPads that do
HFSP EC fan control do implement full-speed and auto modes, some of the
earlier ones supporting HFSP might not.
If the EC ignores the AUTO or FULL-SPEED bits, it will pay attention to the
lower three bits that set the fan level. And as thinkpad-acpi was leaving
these set to zero, it would stop(!) the fan, which is Not A Good Thing.
So, as a safety net, we now make sure to also set the fan level part of the
HFSP register to speed 7 for full-speed, and a minimum of speed 4 for auto
mode.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
| drivers/misc/thinkpad_acpi.c | diffblobblamehistory |