http://bugzilla.kernel.org/show_bug.cgi?id=9167
[EMAIL PROTECTED] changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
Component|ACPICA-Core |Power-Thermal
Summary|ACPI (thermal) problems with|No TZ.temp update, no fan
|Acer Aspire 5720 |control (32-bit ok, 64-bit
| |broken) problems with Acer
| |Aspire 5720, 7720Z - Santa
| |Rosa, T7300
------- Comment #30 from [EMAIL PROTECTED] 2008-01-06 22:37 -------
If I read the comments above correctly...
32-bit Linux works perfectly
1. /proc/acpi/thermal_zone/.../temperature
changes to reflect gross changes in system temperature
2. fan speed changes to reflect changes in system temperature
64-bit Linux fails:
i) /proc/acpi/thermal_zone/.../temperature
reflects boot-time temperature, but never changes
ii) fan speed reflects boot-time demand for fan,
but never changes.
As stated above, ACPI is not involved in fan control on this system.
Indeed, 64-bit Linux may have provoked the system firmware or EC
to fail somehow, and the ACPI temperature file above is simply
a victim of that, as is the firmware-controlled fan.
My first guess would be incompatibility with CONFIG_HWMON --
say a 64-bit bug in a sensor driver --
but it seems that CONFIG_HWMON=n does not help.
Please let me know if my summary is incorrect.
BTW. does the Acer BIOS have any SETUP options related to the fan
or thermal control?
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