http://bugzilla.kernel.org/show_bug.cgi?id=6315
[EMAIL PROTECTED] changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[2.6.16] Fan control broken |Fan control broken for
|for Toshiba Satellite A40 |Toshiba Satellite A40
------- Additional Comments From [EMAIL PROTECTED] 2006-04-23 10:19 -------
Thomas, I am not familiar with ACPI, but my guess is that the ACPI EC somehow
accesses the ADM1032 temperature sensor through the Intel SMBus, just like the
i2c-i801 + lm90 driver combination does, but without proper resource
request/locking. If so, users are likely to observe problems if the acpi
subsystem and the i2c subsystem both access the devices at the same time.
What made things worse in Frans' (and Daniele's) case is that the i2c-i801
driver was leaving the SMBus device in a non-standard state (PEC enabled.) This
wouldn't be a problem if all accesses were going through the i2c-i801 driver as
they should. This also wouldn't be a problem if other subsystems (BIOS, ACPI EC)
accessing the device did not rely on assumptions with regards to the "initial"
state of the SMBus device. Unfortunately, both assertions seem to be false.
The most immediate fix was to revert a change in the i2c-i801 driver, so that it
will again always leave the SMBus device in a standard state. This fix will go
in 2.6.16.10 and 2.6.17-rc3. However, this doesn't address the more general
problem of ACPI EC possibly accessing resources without properly requesting them
beforehand. Suggestions on how this problem could be solved are welcome.
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