To make a long history, short: I think I found the way to switch the EC tachometer to the secondary fan, which is present on the X61, and maybe on other Lenovo ThinkPads. Now, I need help from X61 owners (both with one and two fans) to better narrow it down. If there are other Lenovo thinkpads with two fans (the T61, maybe?), I'd also appreciate a lot reports for such models. Here's how it seems to work: Bit 2 of EC register 0x31 sets which fan the EC will monitor. 0 for the main fan, 1 for the secondary fan. Do NOT touch the other bits, they do something and I don't know what. I'd like to have reports of what happen to the tachometer in a X61 when bit 2 of EC register 0x31 is toggled. Does it really show the speed of the secondary fan? Does it show 0 if there is no secondary fan (or it is stopped)? Also, what happens if you try to control the fan speed and mode with bit 2 of EC 0x31 set? Does it control just the second fan, just the first fan, or both at the same time (likely)? Here's how to toggle the EC 0x31 bit 2: With the module loaded with the experimental=1 parameter, use cat /proc/acpi/ibm/ecdump to check the value of EC register 0x31. Then, use "echo 0x31 new_value > /proc/acpi/ibm/ecdump" (where new_value is the value you read from ecdump, but with bit 2 set or reset. Eg. if EC 0x31 was 0x03, write 0x07 to set bit 2), to change from the primary to secondary fan, and back. How to test: Just use the normal thinkpad-acpi fan-control commands. They should apply to whatever fan is selected by bit 2 of EC register 0x31 (or to both, if the control is not separate). Please report back, there's still time to get this into 2.6.31 :-) -- "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 ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ ibm-acpi-devel mailing list ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/ibm-acpi-devel
