| commit | ea710fe36dc13c25c4034d09f11dd5d0a97dc248 | |
| 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> | |
| Sat, 7 Jul 2007 12:42:34 +0000 (7 09:42 -0300) | ||
| tree | 2cce2ea8072f8fab1994c372b12b01ca5def2143 | treesnapshot (tar.gz zip) |
| parent | 78adf01fe2b362f6a753a4399642c79e56b88bed | 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 |